Materials Science › Materials Chemistry

Hydrogen Storage and Materials

Description

This cluster of papers focuses on the materials, methods, and technologies for hydrogen storage, including metal hydrides, chemical storage solutions like ammonia borane, nanostructured carbon materials, and various catalysts for enhancing hydrogen generation and storage. It covers a wide range of research on improving the capacity, kinetics, and stability of hydrogen storage systems for mobile and stationary applications.

Keywords

Hydrogen Storage; Materials; Metal Hydrides; Chemical Hydrogen Storage; Nanomaterials; Catalysts; Ammonia Borane; Nanostructured Carbon; Hydrogen Generation; Nanoparticles

We report a first-principles study, which demonstrates that a single Ti atom coated on a single-walled nanotube (SWNT) binds up to four hydrogen molecules. The first H$_2$ adsorption is dissociative … We report a first-principles study, which demonstrates that a single Ti atom coated on a single-walled nanotube (SWNT) binds up to four hydrogen molecules. The first H$_2$ adsorption is dissociative with no energy barrier while other three adsorptions are molecular with significantly elongated H-H bonds. At high Ti coverage we show that a SWNT can strongly adsorb up to 8-wt% hydrogen. The system is quite stable and exhibits associative desorption upon heating, a requirement for reversible storage. These results advance our fundamental understanding of dissociative adsorption of hydrogen in nanostructures and suggest new routes to better storage and catalyst materials.
In this review, we survey the research progress in catalytic hydrogen generation from, and the regeneration of, diverse liquid-phase chemical hydrogen storage materials, including both organic and inorganic chemical hydrides. In this review, we survey the research progress in catalytic hydrogen generation from, and the regeneration of, diverse liquid-phase chemical hydrogen storage materials, including both organic and inorganic chemical hydrides.
A multiscale theoretical approach was used to investigate hydrogen storage in a novel three-dimensional carbon nanostructure. This novel nanoporous material has by design tunable pore sizes and surface areas. Its … A multiscale theoretical approach was used to investigate hydrogen storage in a novel three-dimensional carbon nanostructure. This novel nanoporous material has by design tunable pore sizes and surface areas. Its interaction with hydrogen was studied thoroughly via ab initio and grand canonical Monte Carlo calculations. Our results show that, if this material is doped with lithium cations, it can store up to 41 g H2/L under ambient conditions, almost reaching the DOE volumetric requirement for mobile applications.
Lithium- or potassium-doped carbon nanotubes can absorb ∼20 or ∼14 weight percent of hydrogen at moderate (200° to 400°C) or room temperatures, respectively, under ambient pressure. These values are greater … Lithium- or potassium-doped carbon nanotubes can absorb ∼20 or ∼14 weight percent of hydrogen at moderate (200° to 400°C) or room temperatures, respectively, under ambient pressure. These values are greater than those of metal hydride and cryoadsorption systems. The hydrogen stored in the lithium- or potassium-doped carbon nanotubes can be released at higher temperatures, and the sorption-desorption cycle can be repeated with little decrease in the sorption capacity. The high hydrogen-uptake capacity of these systems may be derived from the special open-edged, layered structure of the carbon nanotubes made from methane, as well as the catalytic effect of alkali metals.
If the fuel cell is to become the modern steam engine, basic research must provide breakthroughs in understanding, materials, and design to make a hydrogen-based energy system a vibrant and … If the fuel cell is to become the modern steam engine, basic research must provide breakthroughs in understanding, materials, and design to make a hydrogen-based energy system a vibrant and competitive force
Widespread adoption of hydrogen as a vehicular fuel depends critically upon the ability to store hydrogen on-board at high volumetric and gravimetric densities, as well as on the ability to … Widespread adoption of hydrogen as a vehicular fuel depends critically upon the ability to store hydrogen on-board at high volumetric and gravimetric densities, as well as on the ability to extract/insert it at sufficiently rapid rates. As current storage methods based on physical means--high-pressure gas or (cryogenic) liquefaction--are unlikely to satisfy targets for performance and cost, a global research effort focusing on the development of chemical means for storing hydrogen in condensed phases has recently emerged. At present, no known material exhibits a combination of properties that would enable high-volume automotive applications. Thus new materials with improved performance, or new approaches to the synthesis and/or processing of existing materials, are highly desirable. In this critical review we provide a practical introduction to the field of hydrogen storage materials research, with an emphasis on (i) the properties necessary for a viable storage material, (ii) the computational and experimental techniques commonly employed in determining these attributes, and (iii) the classes of materials being pursued as candidate storage compounds. Starting from the general requirements of a fuel cell vehicle, we summarize how these requirements translate into desired characteristics for the hydrogen storage material. Key amongst these are: (a) high gravimetric and volumetric hydrogen density, (b) thermodynamics that allow for reversible hydrogen uptake/release under near-ambient conditions, and (c) fast reaction kinetics. To further illustrate these attributes, the four major classes of candidate storage materials--conventional metal hydrides, chemical hydrides, complex hydrides, and sorbent systems--are introduced and their respective performance and prospects for improvement in each of these areas is discussed. Finally, we review the most valuable experimental and computational techniques for determining these attributes, highlighting how an approach that couples computational modeling with experiments can significantly accelerate the discovery of novel storage materials (155 references).
Destabilization of LiBH4 for reversible hydrogen storage has been studied using MgH2 as a destabilizing additive. Mechanically milled mixtures of LiBH4 + (1/2)MgH2 or LiH + (1/2)MgB2 including 2-3 mol … Destabilization of LiBH4 for reversible hydrogen storage has been studied using MgH2 as a destabilizing additive. Mechanically milled mixtures of LiBH4 + (1/2)MgH2 or LiH + (1/2)MgB2 including 2-3 mol % TiCl3 are shown to reversibly store 8-10 wt % hydrogen. Variation of the equilibrium pressure obtained from isotherms measured at 315-400 degrees C indicate that addition of MgH2 lowers the hydrogenation/dehydrogenation enthalpy by 25 kJ/(mol of H2) compared with pure LiBH4. Formation of MgB2 upon dehydrogenation stabilizes the dehydrogenated state and, thereby, destabilizes the LiBH4. Extrapolation of the isotherm data yields a predicted equilibrium pressure of 1 bar at approximately 225 degrees C. However, the kinetics were too slow for direct measurements at these temperatures.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSodium Borohydride, Its Hydrolysis and its Use as a Reducing Agent and in the Generation of Hydrogen1H. I. Schlesinger, Herbert C. Brown, A. E. Finholt, James R. … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSodium Borohydride, Its Hydrolysis and its Use as a Reducing Agent and in the Generation of Hydrogen1H. I. Schlesinger, Herbert C. Brown, A. E. Finholt, James R. Gilbreath, Henry R. Hoekstra, and Earl K. HydeCite this: J. Am. Chem. Soc. 1953, 75, 1, 215–219Publication Date (Print):January 1, 1953Publication History Published online1 May 2002Published inissue 1 January 1953https://pubs.acs.org/doi/10.1021/ja01097a057https://doi.org/10.1021/ja01097a057research-articleACS PublicationsRequest reuse permissionsArticle Views9655Altmetric-Citations876LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Decomposition of the Non-Interstitial Hydrides for the Storage and Production of HydrogenWojciech Grochala and Peter P. EdwardsView Author Information The School of Chemistry, The University of … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Decomposition of the Non-Interstitial Hydrides for the Storage and Production of HydrogenWojciech Grochala and Peter P. EdwardsView Author Information The School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT U.K., The Department of Chemistry, The University of Warsaw, Pasteur 1, 02093 Warsaw, Poland, and Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR U.K. Cite this: Chem. Rev. 2004, 104, 3, 1283–1316Publication Date (Web):February 18, 2004Publication History Received27 June 2003Published online18 February 2004Published inissue 1 March 2004https://pubs.acs.org/doi/10.1021/cr030691shttps://doi.org/10.1021/cr030691sresearch-articleACS PublicationsCopyright Ā© 2004 American Chemical SocietyRequest reuse permissionsArticle Views9942Altmetric-Citations1377LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Anions,Elements,Hydrogen,Metals,Organic reactions Get e-Alerts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFundamentals of H2 Binding and Reactivity on Transition Metals Underlying Hydrogenase Function and H2 Production and StorageGregory J. KubasView Author Information Chemistry Division, Los Alamos National Laboratory, … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFundamentals of H2 Binding and Reactivity on Transition Metals Underlying Hydrogenase Function and H2 Production and StorageGregory J. KubasView Author Information Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 Cite this: Chem. Rev. 2007, 107, 10, 4152–4205Publication Date (Web):October 10, 2007Publication History Received19 December 2006Published online10 October 2007Published inissue 1 October 2007https://pubs.acs.org/doi/10.1021/cr050197jhttps://doi.org/10.1021/cr050197jresearch-articleACS PublicationsCopyright Ā© 2007 American Chemical SocietyRequest reuse permissionsArticle Views12219Altmetric-Citations863LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Anions,Hydrogen,Ligands,Metals,Reaction mechanisms Get e-Alerts
Ammonia–borane, H3NBH3, is an intriguing molecule for chemical hydrogen storage applications. With both protic N–H and hydridic B–H bonds, three H atoms per main group element, and a low molecular … Ammonia–borane, H3NBH3, is an intriguing molecule for chemical hydrogen storage applications. With both protic N–H and hydridic B–H bonds, three H atoms per main group element, and a low molecular weight, H3NBH3 has the potential to meet the stringent gravimetric and volumetric hydrogen storage capacity targets needed for transportation applications. Furthermore, devising an energy-efficient chemical process to regenerate H3NBH3 from dehydrogenated BNHx material is an important step towards realization of a sustainable transportation fuel. In this perspective we discuss current progress in catalysis research to control the rate and extent of hydrogen release and preliminary efforts at regeneration of H3NBH3.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of hydrogen with alloys of magnesium and nickel and the formation of Mg2NiH4James J. Reilly Jr. and Richard H. Wiswall Jr.Cite this: Inorg. Chem. 1968, 7, … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of hydrogen with alloys of magnesium and nickel and the formation of Mg2NiH4James J. Reilly Jr. and Richard H. Wiswall Jr.Cite this: Inorg. Chem. 1968, 7, 11, 2254–2256Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.acs.org/doi/10.1021/ic50069a016https://doi.org/10.1021/ic50069a016research-articleACS PublicationsRequest reuse permissionsArticle Views2666Altmetric-Citations963LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
The emergence of a Hydrogen Economy will require the development of new media capable of safely storing hydrogen in a compact and light weight package. Metal hydrides and complex hydrides, … The emergence of a Hydrogen Economy will require the development of new media capable of safely storing hydrogen in a compact and light weight package. Metal hydrides and complex hydrides, where hydrogen is chemically bonded to the metal atoms in the bulk, offer some hope of overcoming the challenges associated with hydrogen storage. The objective is to find a material with a high volumetric and gravimetric hydrogen density that can also meet the unique demands of a low temperature automotive fuel cell. Currently, there is considerable effort to develop new materials with tunable thermodynamic and kinetic properties. This tutorial review provides an overview of the different types of metal hydrides and complex hydrides being investigated for on-board (reversible) and off-board (non-reversible) hydrogen storage along with a few new approaches to improving the hydrogenation-dehydrogenation properties.
Hydrogen storage is a materials science challenge because, for all six storage methods currently being investigated, materials with either a strong interaction with hydrogen or without any reaction are needed. … Hydrogen storage is a materials science challenge because, for all six storage methods currently being investigated, materials with either a strong interaction with hydrogen or without any reaction are needed. Besides conventional storage methods, i.e. high pressure gas cylinders and liquid hydrogen, the physisorption of hydrogen on materials with a high specific surface area, hydrogen intercalation in metals and complex hydrides, and storage of hydrogen based on metals and water are reviewed. The goal is to pack hydrogen as close as possible, i.e. to reach the highest volumetric density by using as little additional material as possible. Hydrogen storage implies the reduction of an enormous volume of hydrogen gas. At ambient temperature and atmospheric pressure, 1 kg of the gas has a volume of 11 m3. To increase hydrogen density, work must either be applied to compress the gas, the temperature decreased below the critical temperature, or the repulsion reduced by the interaction of hydrogen with another material.
Hydrogen storage for transportation applications requires high volumetric and gravimetric storage capacity. B-N compounds are well suited as storage materials due to their light weight and propensity for bearing multiple … Hydrogen storage for transportation applications requires high volumetric and gravimetric storage capacity. B-N compounds are well suited as storage materials due to their light weight and propensity for bearing multiple protic (N-H) and hydridic (B-H) hydrogens. This critical review briefly covers the various methods of hydrogen storage, and then concentrates on chemical hydrogen storage using B-N compounds. The simplest B-N compound, ammonia borane (H3NBH3), which has a potential 19.6 wt% hydrogen storage capacity, will be emphasised (127 references).
With a growing world population, an increasing standard of living in many developing countries, a limited supply of fossil fuels, and its adverse effect on the environment, the need for … With a growing world population, an increasing standard of living in many developing countries, a limited supply of fossil fuels, and its adverse effect on the environment, the need for clean and sustainable energy has never been greater. Hydrogen, the simplest and most abundant element in the universe, has the potential to meet this energy need if numerous hurdles in its efficient and safe production, storage, and use in fuel cell vehicles can be overcome. This Perspective briefly discusses the status of hydrogen storage — past, present, and future.
Abstract Hydrogen is often proposed as the fuel of the future, but the transformation from the present fossil fuel economy to a hydrogen economy will need the solution of numerous … Abstract Hydrogen is often proposed as the fuel of the future, but the transformation from the present fossil fuel economy to a hydrogen economy will need the solution of numerous complex scientific and technological issues, which will require several decades to be accomplished. Hydrogen is not an alternative fuel, but an energy carrier that has to be produced by using energy, starting from hydrogen‐rich compounds. Production from gasoline or natural gas does not offer any advantage over the direct use of such fuels. Production from coal by gasification techniques with capture and sequestration of CO 2 could be an interim solution. Water splitting by artificial photosynthesis, photobiological methods based on algae, and high temperatures obtained by nuclear or concentrated solar power plants are promising approaches, but still far from practical applications. In the next decades, the development of the hydrogen economy will most likely rely on water electrolysis by using enormous amounts of electric power, which in its turn has to be generated. Producing electricity by burning fossil fuels, of course, cannot be a rational solution. Hydroelectric power can give but a very modest contribution. Therefore, it will be necessary to generate large amounts of electric power by nuclear energy of by renewable energies. A hydrogen economy based on nuclear electricity would imply the construction of thousands of fission reactors, thereby magnifying all the problems related to the use of nuclear energy (e.g., safe disposal of radioactive waste, nuclear proliferation, plant decommissioning, uranium shortage). In principle, wind, photovoltaic, and concentrated solar power have the potential to produce enormous amounts of electric power, but, except for wind, such technologies are too underdeveloped and expensive to tackle such a big task in a short period of time. A full development of a hydrogen economy needs also improvement in hydrogen storage, transportation and distribution. Hydrogen and electricity can be easily interconverted by electrolysis and fuel cells, and which of these two energy carriers will prevail, particularly in the crucial field of road vehicle powering, will depend on the solutions found for their peculiar drawbacks, namely storage for electricity and transportation and distribution for hydrogen. There is little doubt that power production by renewable energies, energy storage by hydrogen, and electric power transportation and distribution by smart electric grids will play an essential role in phasing out fossil fuels.
In the search for future energy supplies, the application of hydrogen as an energy carrier is seen as a prospective issue. However, the implementation of a hydrogen economy is suffering … In the search for future energy supplies, the application of hydrogen as an energy carrier is seen as a prospective issue. However, the implementation of a hydrogen economy is suffering from several unsolved problems. Particularly challenging is the storage of appropriate amounts of hydrogen. In this context one of the promising hydrogen storage techniques relies on liquid-phase chemical hydrogen storage materials, in particular, aqueous sodium borohydride, ammonia borane, hydrazine, hydrazine borane and formic acid. The use of these materials in hydrogen storage provides high gravimetric and volumetric hydrogen densities, low potential risk, and low capital investment because it is largely compatible with the current transport infrastructure. In this review, we survey the research progresses in hydrogen generation from these liquid-phase chemical hydrogen storage materials and their regeneration.
Hydrogen-rich materials infused in nanoscaffolds offer a promising approach to on-board hydrogen storage. A mesoporous scaffold decreases the temperature for hydrogen release from ammonia borane (AB), a conventional hydrogen-storage material, … Hydrogen-rich materials infused in nanoscaffolds offer a promising approach to on-board hydrogen storage. A mesoporous scaffold decreases the temperature for hydrogen release from ammonia borane (AB), a conventional hydrogen-storage material, to below 80 °C and leads to an increase in the purity of the hydrogen released. (See schematic representation of a hydrogen-bonded AB network in the cross-section of a single pore.)
Hydrogen is a promising energy carrier in future energy systems. However, storage of hydrogen is a substantial challenge, especially for applications in vehicles with fuel cells that use proton-exchange membranes … Hydrogen is a promising energy carrier in future energy systems. However, storage of hydrogen is a substantial challenge, especially for applications in vehicles with fuel cells that use proton-exchange membranes (PEMs). Different methods for hydrogen storage are discussed, including high-pressure and cryogenic-liquid storage, adsorptive storage on high-surface-area adsorbents, chemical storage in metal hydrides and complex hydrides, and storage in boranes. For the latter chemical solutions, reversible options and hydrolytic release of hydrogen with off-board regeneration are both possible. Reforming of liquid hydrogen-containing compounds is also a possible means of hydrogen generation. The advantages and disadvantages of the different systems are compared.
The porosity and hydrogen storage properties for the dehydrated Prussian blue analogues M3[Co(CN)6]2 (M = Mn, Fe, Co, Ni, Cu, Zn) are reported. Argon sorption isotherms measured at 87 K … The porosity and hydrogen storage properties for the dehydrated Prussian blue analogues M3[Co(CN)6]2 (M = Mn, Fe, Co, Ni, Cu, Zn) are reported. Argon sorption isotherms measured at 87 K afford BET surface areas ranging from 560 m2/g for Ni3[Co(CN)6]2 to 870 m2/g for Mn3[Co(CN)6]2; the latter value is comparable to the highest surface area reported for any known zeolite. All six compounds show significant hydrogen sorption at 77 K and 890 Torr, varying from 1.4 wt % and 0.018 kg H2/L for Zn3[Co(CN)6]2 to 1.8 wt % and 0.025 kg H2/L for Cu3[Co(CN)6]2. Fits to the sorption data employing the Langmuir-Freundlich equation give maximum uptake quantities, resulting in a predicted storage capacity of 2.1 wt % and 0.029 kg H2/L for Cu3[Co(CN)6]2 at saturation. Enthalpies of adsorption for the frameworks were calculated from hydrogen isotherms measured at 77 and 87 K and found to increase with M varying in the order Mn < Zn < Fe < Co < Cu < Ni. In all cases, the binding enthalpies, which lie in the range of 5.3-7.4 kJ/mol, are higher than the 4.7-5.2 kJ/mol measured for Zn4O(1,4-benzenedicarboxylate)3.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex Hydrides for Hydrogen StorageShin-ichi Orimo, Yuko Nakamori, Jennifer R. Eliseo, Andreas Züttel, and Craig M. JensenView Author Information Institute for Materials Research, Tohoku University, Sendai 980-8577, … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex Hydrides for Hydrogen StorageShin-ichi Orimo, Yuko Nakamori, Jennifer R. Eliseo, Andreas Züttel, and Craig M. JensenView Author Information Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, Hawaii Hydrogen Carriers, LLC, Honolulu, Hawaii 96813, Department of Mobility, Environment, and Energy, EMPA Materials Sciences and Technology, 8600 Dübendorf, Switzerland, and Department of Chemistry, University of Hawaii, Honolulu, Hawaii 96822 Cite this: Chem. Rev. 2007, 107, 10, 4111–4132Publication Date (Web):September 12, 2007Publication History Received7 June 2007Published online12 September 2007Published inissue 1 October 2007https://pubs.acs.org/doi/10.1021/cr0501846https://doi.org/10.1021/cr0501846research-articleACS PublicationsCopyright Ā© 2007 American Chemical SocietyRequest reuse permissionsArticle Views16543Altmetric-Citations1899LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Amides,Anions,Hydrogen,Kinetics,Organic reactions Get e-Alerts
Hydrogen may play a key role in a future sustainable energy system as a carrier of renewable energy to replace hydrocarbons. This review describes the fundamental physical and chemical properties … Hydrogen may play a key role in a future sustainable energy system as a carrier of renewable energy to replace hydrocarbons. This review describes the fundamental physical and chemical properties of hydrogen and basic theories of hydrogen sorption reactions, followed by the emphasis on state-of-the-art of the hydrogen storage properties of selected interstitial metallic hydrides and magnesium hydride, especially for stationary energy storage related utilizations. Finally, new perspectives for utilization of metal hydrides in other applications will be reviewed.
The large-scale storage of hydrogen plays a fundamental role in a potential future hydrogen economy. Although the storage of gaseous hydrogen in salt caverns already is used on a full … The large-scale storage of hydrogen plays a fundamental role in a potential future hydrogen economy. Although the storage of gaseous hydrogen in salt caverns already is used on a full industrial scale, the approach is not applicable in all regions due to varying geological conditions. Therefore, other storage methods are necessary. In this article, options for the large-scale storage of hydrogen are reviewed and compared based on fundamental thermodynamic and engineering aspects. The application of certain storage technologies, such as liquid hydrogen, methanol, ammonia, and dibenzyltoluene, is found to be advantageous in terms of storage density, cost of storage, and safety. The variable costs for these high-density storage technologies are largely associated with a high electricity demand for the storage process or with a high heat demand for the hydrogen release process. If hydrogen is produced via electrolysis and stored during times of low electricity prices in an industrial setting, these variable costs may be tolerable.
Graphite nanofibers are a novel material that is produced from the dissociation of carbon-containing gases over selected metal surfaces. The solid consists of very small graphite platelets, 30āˆ’500 ƅ in … Graphite nanofibers are a novel material that is produced from the dissociation of carbon-containing gases over selected metal surfaces. The solid consists of very small graphite platelets, 30āˆ’500 ƅ in width, which are stacked in a perfectly arranged conformation. We have discovered that the material is capable of sorbing and retaining in excess of 20 L (STP) of hydrogen per gram of carbon when the nanofibers are exposed to the gas at pressures of 120 atm at 25 °C, a value that is over an order of magnitude higher than that found with conventional hydrogen storage systems. This behavior is rationalized in terms of the unique crystalline arrangement existing within the graphite nanofiber structure, where the platelets generate a system comprised entirely of slit-shaped nanopores, in which only edge sites are exposed. Since the interplanar distance within the material is 3.37 ƅ, sorption of molecular hydrogen, which possesses a kinetic diameter of 2.89 ƅ, is a facile process owing to the short diffusion path. In addition, owing to the weak (van der Waals) bonding of the platelets, these nonrigid wall nanopores can expand to accommodate hydrogen in a multilayer configuration. Subsequent lowering of the pressure to nearly atmospheric conditions results in the release of a major fraction of the stored hydrogen at room temperature.
Magnesium hydride owns the largest share of publications on solid materials for hydrogen storage. The Magnesium group of international experts contributing to IEA Task 32 Hydrogen Based Energy Storage recently … Magnesium hydride owns the largest share of publications on solid materials for hydrogen storage. The Magnesium group of international experts contributing to IEA Task 32 Hydrogen Based Energy Storage recently published two review papers presenting the activities of the group focused on magnesium hydride based materials and on Mg based compounds for hydrogen and energy storage. This review article not only overviews the latest activities on both fundamental aspects of Mg-based hydrides and their applications, but also presents a historic overview on the topic and outlines projected future developments. Particular attention is paid to the theoretical and experimental studies of Mg-H system at extreme pressures, kinetics and thermodynamics of the systems based on MgH2,nanostructuring, new Mg-based compounds and novel composites, and catalysis in the Mg based H storage systems. Finally, thermal energy storage and upscaled H storage systems accommodating MgH2 are presented.
Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors as they are expected to mimic characteristics of metallic hydrogen. Recent experiments discovered superhydrides at very high pressures, e.g. FeH5 … Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors as they are expected to mimic characteristics of metallic hydrogen. Recent experiments discovered superhydrides at very high pressures, e.g. FeH5 at 130 GPa and LaH10 at 170 GPa. With the motivation of discovering new hydrogen-rich high-Tc superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH9 below 100 GPa in the laser-heated diamond anvil cell. Ab-initio calculations were carried to evaluate the detailed chemistry of the Ce-H system and to understand the structure, stability and superconductivity of CeH9. CeH9 crystallizes in a P63/mmc clathrate structure with a substantially dense 3-dimensional hydrogen sublattice at 100 GPa. These findings shed a new light on the search for superhydrides in close proximity with atomic hydrogen within a feasible pressure range. Discovery of superhydride CeH9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides.
Abstract This study examines the structural, electronic, optical, elastic, thermodynamic, and hydrogen storage properties of KSrZH 6 (Z = Rh, Ir) utilizing density functional theory to explore their potential as … Abstract This study examines the structural, electronic, optical, elastic, thermodynamic, and hydrogen storage properties of KSrZH 6 (Z = Rh, Ir) utilizing density functional theory to explore their potential as hydrogen storage materials. The structural analysis confirms that all the studied materials crystallize in the cubic phase with space group 216 (). The phonon dispersion and ab initio molecular dynamics (AIMD) computations reveal dynamic and thermal stability for both compounds. In addition, the electronic structures exhibit indirect semiconducting properties, with an extensive hybridization near the Fermi level between 1s‐orbitals of hydrogen (H), and d‐orbitals of the transition metals (Rh and Ir). Furthermore, optical investigations reveal significant UV absorption, as well as a moderate refractive index and reflectivity, which can be useful in optoelectronic devices. All of the studied materials possess mechanical stability and show brittle properties. Among the compounds, KSrRhH 6 exhibits the highest gravimetric hydrogen storage capacity of 2.57 wt.%, while KSrIrH 6 shows a slightly lower value of 1.86 wt.%. The storage capacity decreases when the cationic atom Rh is substituted with Ir, attributed to variations in atomic radius. This comprehensive study underscores the promising potential of KSrZH 6 (Z = Rh, Ir) for both hydrogen storage and optoelectronic applications.
Levent Semiz | International Journal of Pioneering Technology and Engineering
In this study, the catalytic activity of starch, cellulose and coffee were investigated in the dehydrogenation of sodium borohydride. The hydrogen generation rates of starch, cellulose and coffee were measured … In this study, the catalytic activity of starch, cellulose and coffee were investigated in the dehydrogenation of sodium borohydride. The hydrogen generation rates of starch, cellulose and coffee were measured as 4.0, 6.7 and 60 ml H2 min-1 g-1 and the activation energies of the reactions were calculated as 27.4, 17.1 and 14.5 kJ mol-1 for starch, cellulose and coffee respectively. The study showed that natural sources could be used directly as catalysts in the dehydrogenation of chemical hdyrides.
Abstract The interplay of superconducting and topological states in two-dimensional materials has gained intensive attention for exploring novel quantum phenomena and their applications in quantum computing. However, two-dimensional materials exhibiting … Abstract The interplay of superconducting and topological states in two-dimensional materials has gained intensive attention for exploring novel quantum phenomena and their applications in quantum computing. However, two-dimensional materials exhibiting both superconductivity and topological phases are exceptionally rare. In this context, we investigated two-dimensional CrH 2&amp;#xD;(chromium dihydride) in P6m2 (hexagonal) and P3m1 (trigonal) symmetries using first-principles calculations. We verified the stability of these phases using phonon dispersion and mechanical stability analyses. Based on our Z 2 invariant&amp;#xD;calculations, CrH 2 is topologically nontrivial for the P6m2 symmetry, while it is topologically trivial for the P3m1 symmetry. Using anisotropic Migdal-Eliashberg equations, we find both phases as single-gap superconductors, with transition temperatures of ∼11K for the hexagonal phase and ∼8K for the trigonal phase. The superconducting properties are attributed to electron-phonon&amp;#xD;coupling between Cr-d orbitals and low-energy phonon modes dominated by Cr vibrations. Our findings offer a promising foundation for further exploration of co-existence of topological and superconducting states in monolayer hydrides and&amp;#xD;their experimental realization.
Hao Cheng | Academic Journal of Science and Technology
Hydrogen, recognized as a clean and sustainable energy carrier, is gaining increasing attention due to its high energy density and low environmental impact. Underground hydrogen storage (UHS) offers a feasible … Hydrogen, recognized as a clean and sustainable energy carrier, is gaining increasing attention due to its high energy density and low environmental impact. Underground hydrogen storage (UHS) offers a feasible solution to balance hydrogen supply and demand on a large scale. This review comprehensively summarizes the main characteristics of hydrogen under various PVT conditions, its environmental benefits, and the rationale for considering underground storage. Key factors influencing UHS, including geochemical and microbial reactions and storage integrity, are analyzed. The principles of UHS and the types of geological formations suitable for storage—such as salt caverns, aquifers, and depleted oil and gas reservoirs—are reviewed along with current domestic and international projects. Special focus is given to the technical challenges of using depleted reservoirs, including issues of leakage, trap and facility integrity, and hydrogen consumption via sulfide reactions. The paper concludes that China has strategic advantages in developing UHS due to abundant geological resources, technological innovation potential, and an integrated hydrogen industry chain, although it is still in the early stages of development.
Abstract Deep eutectic solvents (DESs) are novel mixtures that exhibit a significant depression in melting points compared to their individual components. This work finds that combining tetrabutylammonium borohydride (TBABH) with … Abstract Deep eutectic solvents (DESs) are novel mixtures that exhibit a significant depression in melting points compared to their individual components. This work finds that combining tetrabutylammonium borohydride (TBABH) with ammonia borane (AB) yields new, stable, hydrogen‐rich liquids under ambient conditions, with a glass transition as low as āˆ’50 °C. Liquid mixtures containing up to 6.9 wt% hydrogen can be easily obtained through physical grinding. The strong interaction between the BH 4 āˆ’ anion of TBABH and AB coupled with the vibration dynamics of the alkyl chains accounts for the sharp decrease in melting point. The eutectic point is identified at a TBABH‐AB molar ratio of 1–2. Increasing the AB ratio further reduces the glass transition temperature but also induces a cold crystallization phenomenon. These mixtures can release hydrogen at temperatures as low as 60 °C, making them promising candidates for hydrogen storage. This represents the first example of a hydride‐based DES, advancing research on complex hydrides and opening the door to the discovery of new hydrogen‐rich liquids for various applications.
Efficient CH 4 storage remains a central challenge in enabling large‐scale applications of CH 4 fuel cells. The metal‐modified holey graphdiyne (HGY) CH 4 storage system proposed in this study … Efficient CH 4 storage remains a central challenge in enabling large‐scale applications of CH 4 fuel cells. The metal‐modified holey graphdiyne (HGY) CH 4 storage system proposed in this study holds promise as a high‐performance fuel storage unit for fuel cell systems. The CH 4 storage performance of alkali metal‐modified HGY systems is investigated based on density functional theory. The 4Li@HGY system can adsorb 37 CH 4 , achieving a storage capacity of 65.3 wt% with an average adsorption energy of āˆ’0.243 eV. Similarly, the 4Na@HGY system adsorbs 41 CH 4 , with a storage capacity of 63.4 wt% and an average adsorption energy of āˆ’0.236 eV, both exceeding the U.S. Department of Energy's 50 wt% standard. CH 4 adsorption occurs through interactions with metal atoms, substrate carbon atoms, and other CH 4 molecules, with the metal–CH 4 interaction being the strongest. HGY contains a large pore with a diameter of 10.119 ƅ, which can accommodate a single CH 4 . This insertion induces special polarization and creates electron‐rich regions on both sides of the substrate plane. The CH 4 thus acts as an attractive bridge, providing adsorption sites for CH 4 around the large pore. In summary, this breakthrough material holds great promise for advancing CH 4 storage technology.
Ammonia borane (AB), with a theoretical hydrogen content of 19.6 wt%, is constrained by its low crystalline density (0.758 g/cm3) and poor thermal stability (decomposing at 100 °C). In this … Ammonia borane (AB), with a theoretical hydrogen content of 19.6 wt%, is constrained by its low crystalline density (0.758 g/cm3) and poor thermal stability (decomposing at 100 °C). In this study, AB/ammonium perchlorate (AP) composites were synthesized via freeze-drying at a 1:1 molar ratio. The integration of AP introduced intermolecular interactions that suppressed AB decomposition, increasing the onset temperature by 80 °C. Subsequent vacuum calcination at 100 °C for 2 h formed oxygen/fuel-integrated ammonium perchlorate borane (APB), which achieved decomposition temperatures exceeding 350 °C. The proposed mechanism involved AB decomposing into borazine and BN polymers at 100 °C, which then NH3BH2+/ClO4āˆ’ combined to form APB. At 350 °C, APB underwent the following redox reactions: 4NH3BH2ClO4 → N2↑ + 4HCl↑ + 2B2O3 + N2O↑ + O2↑ + 7H2O↑ + H2↑, while residual AP decomposed. The composite exhibited improved density (1.66 g/cm3) and generated H2, N2, O2, and HCl, demonstrating potential for hydrogen storage. Additionally, safety was enhanced by the suppression of AB’s exothermic decomposition (100–200 °C). APB, with its high energy density and thermal stability, was identified as a promising high-energy additive for high-burning-rate propellants.
This review delves into the advancements of TiFe alloy for solid-state hydrogen storage, highlighting its structure, properties, preparation method, and hydrogen storage performance. The impact of alloy composition and microstructure … This review delves into the advancements of TiFe alloy for solid-state hydrogen storage, highlighting its structure, properties, preparation method, and hydrogen storage performance. The impact of alloy composition and microstructure of the TiFe alloy upon the hydrogen storage kinetics were explored and summarized, as well as on hydrogen storage capacity. The work details the synthesis methods, from induction melting to mechanical alloying, and discusses strategies to enhance TiFe's hydrogen absorption/desorption rates and cycling stability. Emphasis is placed on the role of process control agents and nanostructuring in improving the hydrogen storage performance of TiFe alloy. This review underscores the potential of TiFe alloys in realizing a sustainable hydrogen economy and outlines challenges in activation conditions and cost reduction, providing a roadmap for future research directions.
ABSTRACT Using density functional theory and molecular dynamics simulation, we investigate the potential of lithium‐doped beryllonitrene (Li‐doped BeN 4 ) as a hydrogen storage material. To identify the most suitable … ABSTRACT Using density functional theory and molecular dynamics simulation, we investigate the potential of lithium‐doped beryllonitrene (Li‐doped BeN 4 ) as a hydrogen storage material. To identify the most suitable dopant, we explore the adsorption of various metals viz. sodium, potassium, calcium, magnesium, and lithium over the BeN 4 surface. Among these, the Li atom is chemisorbed strongly with BeN 4 evident from charge transfer analysis and a binding energy amounting to āˆ’1.30 eV. Charge density isosurface analysis further supports significant charge transfer from Li to BeN 4 . Li‐doped BeN 4 demonstrates a remarkable hydrogen storage capacity of 8.32%, capable of adsorbing up to seven H 2 molecules. The average adsorption energy is āˆ’0.22 eV per hydrogen molecule, which increases further after incorporating van der Waals correction. To confirm the stability of the material at room temperature, the molecular dynamics simulation has been performed. Overall, high gravimetric wt% for H 2 storage, suitable binding energy, stability at room temperature, and desorption temperature makes Li‐doped BeN 4 a fortunate candidate for the fabrication of devices to be used for efficient hydrogen storage.
ABSTRACT Cyclo[18]carbon is a newly synthesized carbon nano ring and the smallest among the family, consisting of eighteen carbon atoms structured in a cyclic polyyne form. A single Scandium atom … ABSTRACT Cyclo[18]carbon is a newly synthesized carbon nano ring and the smallest among the family, consisting of eighteen carbon atoms structured in a cyclic polyyne form. A single Scandium atom linked to the C18 bridge site, having āˆ’2.47 eV binding energy, allows the incorporation of seven molecular hydrogens exhibiting an average molecular adsorption energy of āˆ’0.29 eV. These predicted an average desorption temperature of 369.5 K, enabling its utilization in fuel cells. The estimated weight percentage of hydrogen for the 7 H 2 adsorbed system is 14.74 wt%, which is higher than most of the scandium‐decorated hydrogen storage materials. This high weight percentage is attributed to the strong hydrogen adsorption capacity of Sc and the relatively lesser carbon atoms in the C18 platform and the stable structure among cyclo‐n‐carbons. The structural and thermal stability of the C18‐Sc platform was confirmed via the estimation of the diffusion energy barrier and molecular dynamics simulations. Based on the calculated binding energy, desorption temperature, and hydrogen weight percentage, we conclude that scandium‐decorated cyclo[18]carbon is a promising candidate for energy storage applications.
The simultaneous presence of hydride (H-) and oxide (O2-) anions in an inorganic material is thermodynamically challenging. Oxyhydrides have always been synthesized from an oxide precursor, by using high-temperature solid-state … The simultaneous presence of hydride (H-) and oxide (O2-) anions in an inorganic material is thermodynamically challenging. Oxyhydrides have always been synthesized from an oxide precursor, by using high-temperature solid-state reaction using a mixture of oxide and hydride, topochemical reduction at mild temperatures, or high-pressure synthesis. Here, we introduce a novel and unprecedented synthesis route for transition metal oxyhydrides, where the starting material is not an oxide but an intermetallic compound, LaScSi. The topochemical synthesis of LaScSiOxHy (x ā‰ˆ 0.5, y ā‰ˆ 1) occurs through water dissociation, highlighting the exceptional catalytic behavior of the electride-type parent material. The topochemical insertion of oxygen and hydrogen transforms LaScSi into a more two-dimensional material and modifies its electronic properties, altering its transport properties, from three-dimensional metallic to semimetallic. This innovative path to oxyhydrides is also of fundamental interest for catalysis: it could open the way for new methods of hydrogen production and storage, especially in water splitting, bypassing traditional processes such as electrolysis or photocatalysis.
Magnesium hydride (MgH2) is a promising solid‐state hydrogen storage material due to its high capacity and low cost, but its high dehydrogenation temperature and poor kinetic limits its applications. Although … Magnesium hydride (MgH2) is a promising solid‐state hydrogen storage material due to its high capacity and low cost, but its high dehydrogenation temperature and poor kinetic limits its applications. Although catalytic modification of MgH2 has been extensively studied, existing efforts focus on optimizing hydrogen transfer, with limited exploration of electron transfer and transport. This study investigated the enhancement of electron transfer and transport rates during MgH2 de/hydrogenation by introducing a single‐atom catalyst composed of Ru single atoms on a Nb2O5 substrate. The Ru0.028@Nb2O5 single‐atom catalyst reduced the peak dehydrogenation temperature of MgH2 from 429 to 214 °C, and the activation energies for de/hydrogenation were reduced by 53.7% and 83.9%, respectively. Furthermore, the 15wt%‐Ru0.028@Nb2O5‐MgH2 composite maintained 97.4% capacity after 100 cycles. Based on excellent performance and theoretical calculations, it was demonstrated that the electronic structure modulation of Nb2O5 by Ru single atoms enhanced the electron transfer and transport capacities, and the synergistic effects of single‐atom Ru (dominant role), multivalent Nb, and oxygen vacancies resulted in remarkable catalytic activity. This study offers a new strategy for improving electron transfer and transport by modulating the electronic structure of catalysts, thereby increasing catalytic activity during the solid‐state pyrolysis reaction of hydrogen storage materials.
Magnesium hydride (MgH2) is a promising solid‐state hydrogen storage material due to its high capacity and low cost, but its high dehydrogenation temperature and poor kinetic limits its applications. Although … Magnesium hydride (MgH2) is a promising solid‐state hydrogen storage material due to its high capacity and low cost, but its high dehydrogenation temperature and poor kinetic limits its applications. Although catalytic modification of MgH2 has been extensively studied, existing efforts focus on optimizing hydrogen transfer, with limited exploration of electron transfer and transport. This study investigated the enhancement of electron transfer and transport rates during MgH2 de/hydrogenation by introducing a single‐atom catalyst composed of Ru single atoms on a Nb2O5 substrate. The Ru0.028@Nb2O5 single‐atom catalyst reduced the peak dehydrogenation temperature of MgH2 from 429 to 214 °C, and the activation energies for de/hydrogenation were reduced by 53.7% and 83.9%, respectively. Furthermore, the 15wt%‐Ru0.028@Nb2O5‐MgH2 composite maintained 97.4% capacity after 100 cycles. Based on excellent performance and theoretical calculations, it was demonstrated that the electronic structure modulation of Nb2O5 by Ru single atoms enhanced the electron transfer and transport capacities, and the synergistic effects of single‐atom Ru (dominant role), multivalent Nb, and oxygen vacancies resulted in remarkable catalytic activity. This study offers a new strategy for improving electron transfer and transport by modulating the electronic structure of catalysts, thereby increasing catalytic activity during the solid‐state pyrolysis reaction of hydrogen storage materials.