Energy density and economic analysis of different hydrogen storage methods

Part 1 Introduction: Hydrogen storage technologies Hydrogen futures: Emerging technologies for hydrogen storage and transport Hydrogen containment materials Solid-state hydrogen storage system design. Part 2 Analysing hydrogen interactions: Structural characterisation of hydride materials Neutron scattering techniques for analysing solid-state hydrogen storage Reliably measuring hydrogen uptake in storage materials Modelling of carbon-based materials for hydrogen storage. Part 3 Physically bound hydrogen storage: Storage of hydrogen in zeolites Carbon nanostructures for hydrogen storage Metal-organic framework materials for hydrogen storage. Part 4 Chemically bound hydrogen storage: Intermetallics for hydrogen storage Magnesium hydride for hydrogen storage Alanates as hydrogen storage materials Borohydrides as hydrogen storage materials Imides and amides as hydrogen storage materials Multicomponent hydrogen storage systems Organic liquid carriers for hydrogen storage Indirect hydrogen storage in metal ammines Conclusion: Technological challenges in hydrogen storage.

Alternative long-term storage of energy is becoming increasingly important due to climate change. Hydrogen-based storage technologies have long been considered promising alternatives to batteries. However, the different forms of hydrogen storage have various disadvantages and are still comparatively expensive. As an alternative, this paper deals with a new concept for hydrogen storage, the Cryogenic Flux Capacitor (CFC). It is intended as an intermediate between high-pressure and liquid storage to exploit the advantages and reduce the disadvantages. This paper ranks the CFC technology against the others. For this purpose, it investigates the economic viability and the specific application as a grid-connected system. A complete system from hydrogen production and storage to conversion into electrical energy is considered. In detail, the costs for storage and storage time are compared, and the size scaling of a CFC-based system as a grid-connected system is examined. The Levelized Costs of Energy (LCOE) are calculated and compared as a benchmark. It turns out that a CFC-based storage system also requires a tremendous amount of energy in the form of liquid nitrogen and the associated operational costs for cooling down the hydrogen. Nevertheless, the overall operating costs are between high-pressure and liquid hydrogen storage. Most surprising is the LCOE, which, at 0.192 $/kWh–0.234 $/kWh, is well within the range of the other storage technologies. As a grid-connected storage system, CFC technology can be used as a small- to a medium-scale energy storage system, e.g., to serve smaller neighborhoods.

Nowadays, high-pressure hydrogen storage is the most commercially used technology owing to its high hydrogen purity, rapid charging/discharging of hydrogen, and low-cost manufacturing. Despite numerous reviews on hydrogen storage technologies, there is a relative scarcity of comprehensive examinations specifically focused on high-pressure gaseous hydrogen storage and its associated materials. This article systematically presents the manufacturing processes and materials used for a variety of high-pressure hydrogen storage containers, including metal cylinders, carbon fiber composite cylinders, and emerging glass material-based hydrogen storage containers. Furthermore, it introduces the relevant principles and theoretical studies, showcasing their advantages and disadvantages compared to conventional high-pressure hydrogen storage containers. Finally, this article provides an outlook on the future development of high-pressure hydrogen storage containers.

This paper gives an overview of the current status and future potential of hydrogen storage from a chemistry perspective and is based on the concluding presentation of the Faraday Discussion 151--Hydrogen Storage Materials. The safe, effective and economical storage of hydrogen is one of the main scientific and technological challenges in the move towards a low-carbon economy. One key sector is transportation where future vehicles will most likely be developed around a balance of battery-electric and hydrogen fuel-cell electric technologies. Although there has been a very significant research effort in solid-state hydrogen storage, high-pressure gas storage combined with conventional metal hydrides is still seen as the current intermediate-term candidate for car manufacturers. Significant issues have arisen in the search for improved solid-state hydrogen storage materials; for example, facile reversibility has been a major challenge for many recently studied complex hydrides while physisorption in porous structures is still restricted to cryogenic temperatures. However, many systems fulfil the majority of necessary criteria for improved hydrogen storage--indeed, the discovery of reversibility in multicomponent hydride systems along with recent chemistry breakthroughs in off-board and solvent-assisted regeneration suggest that the goal of both improved on-board reversible and off-board regenerated hydrogen storage systems can be achieved.

Effective hydrogen storage is still a challenge because the common approach to store hydrogen gas mechanically compressed in cylinders can be unsafe due to the high pressure and flammability risks involved. A promising alternative is solid-state hydrogen storage in lightweight materials. In this work, we explore ways to store hydrogen in ultrafine nanoporous aluminum during real-time fabrication of this nanoporous aluminum. Here I will present our novel scalable air-free synthesis method for ultrafine and oxide-free nanoporous aluminum with structure size in the range of 10-20 nm via selective electrolytic dealloying [1,2] and show how we extend this method to incorporate hydrogen in this nanoporous aluminum. Hydrogen can then be released by heating the material at moderate temperatures (~130°C). This method of hydrogen storage can find great use in on-board hydrogen storage for vehicular applications. [1] J.S. Corsi, J. Fu, Z. Wang, T. Lee, A. K. Ng, and E. Detsi: ACS Sustainable Chem. Eng. 7 (2019). [2] T. Lee, J. Fu, V. Basile, J. Corsi, Z. Wang, and E. Detsi: Under Review.

Hydrogen storage is one of the most significant research areas for exploiting hydrogen energy economy. To store hydrogen with a high gravimetric/volumetric density, gaseous hydrogen storage systems require a very high-pressure compressed gas cylinder which is quite unsafe and the storage in the liquid form needs cryogenic containers to be maintained at roughly 20 K under ambient pressure because hydrogen has a very low critical temperature of 33 K. However, hydrogen can be stored in solid materials with higher concentration of hydrogen compared to the gaseous and liquid hydrogen storage systems. It is therefore, worthwhile to look into the experimental and theoretical research on prospective hydrogen storage materials. The hydride-forming alloys and intermetallic compounds are found to be the most important families of hydrogen storage materials. Multicomponent alloys consisting of five or more principal elements, also known as high-entropy alloys appear to have potential for the development as hydrogen storage materials. Hydride-forming elements like Ti, Zr, V, Nb, Hf, Ta, La, Ce, Ni, and others have been shown to have hydrogen storage properties and the ability to produce single-phase high-entropy intermetallics. Here, attempts will be made to present a short review on utilization of multicomponent high-entropy alloys as solid hydrogen storage materials. Furthermore, we will also present some of our work on the synthesis, structural–microstructural characterization and hydrogen storage properties of Ti–Zr–V–Cr–Ni equi-atomic hydride-forming high-entropy alloys. From the preliminary investigation, the maximum storage capacity in this system was observed to be 1.78 wt%, which is comparable to other hydrogen storage materials. The prospects of high-entropy-based alloys for hydrogen storage will be discussed.

The world is moving toward sustainable and low-carbon energy systems, which means we need hydrogen storage solutions that are safe, scalable, and cost-effective. Among several methods, solid-state hydrogen storage has become a promising alternative to traditional gaseous and liquid storage methods because it has a higher gravimetric capacity, is more stable, and is safer. This chapter delineates a computational analysis of perovskite hydrides XYH3 (X = Li, Na, K) employing first-principles density functional theory (DFT). The study thoroughly investigates their structural, electrical, optical, and mechanical properties to assess their viability for hydrogen storage applications. LiYH3, NaYH3, and KYH3 have lattice constants of 4.42 Å, 4.30 Å, and 4.41 Å, and their gravimetric hydrogen storage capacities are 3.06 wt%, 2.64 wt%, and 2.31 wt%, respectively. Thermodynamic study showed that the formation enthalpies were negative (−16.19 eV, −13.54 eV, and − 9.13 eV), which confirmed their stability. The Gibbs free energy values at 1000 K were also still good (−0.51 eV, −0.69 eV, and − 1.48 eV). The mechanical investigation showed that Young’s moduli were 27.59 GPa, 52.19 GPa, and 49.29 GPa, and all of the compounds were brittle (B/G < 1.75). Optical tests revealed significant absorption peaks between 26 and 29 eV, underscoring their suitability for optoelectronic applications. These findings underscore that perovskite hydrides are promising candidates for next-generation hydrogen storage devices, providing computationally informed design principles that enhance experimental initiatives. This combination of simulation and materials engineering helps create solid-state hydrogen storage solutions that are efficient, long-lasting, and cheap, which is important for the growth of the hydrogen economy.

As a kind of clean energy, hydrogen energy has great potential to reduce environmental pollution and provide efficient energy conversion, and the key to its efficient utilization is to develop safe, economical and portable hydrogen storage technology. At present, hydrogen storage technology lags behind hydrogen production and use, which is the bottleneck restricting the development of hydrogen energy. In this paper, several current solid-state hydrogen storage methods are reviewed, including hydrate hydrogen storage, alloy hydrogen storage and MOF hydrogen storage. At the hydrogen storage density level, the hydrogen storage capacity of 1K-MOF-5 can reach 4.23 wt% at 77 K and 10 MPa, and remains basically unchanged in 20 isothermal adsorption and desorption experiments. At the level of temperature and pressure of hydrogen storage, the alloy can realize hydrogen storage under ambient conditions. At the economic level, the cost of hydrogen storage in hydrates is only USD 5–8 per kilogram, with almost zero carbon emissions. Through the analysis, it can be seen that the above solid-state hydrogen storage technologies have their own advantages. Although hydrate hydrogen storage is lower than alloy materials and MOF materials in hydrogen storage density, it still has huge potential for utilization space because of its low cost and simple preparation methods. This paper further provides a comprehensive review of the existing challenges in hydrate research and outlines prospective directions for the advancement of hydrogen storage technologies.

Unraveling the Potential of Solid-State Hydrogen Storage Materials: Insights from First Principle Calculations

A comprehensive review on hydrogen production and utilization in North America: Prospects and challenges

Recent advancement in metal-organic frameworks for hydrogen storage: Mechanisms, influencing factors and enhancement strategies

Hydrogen storage is one of the major obstacles to overcoming so that hydrogen becomes next fuel and/or energy carrier of the future. The hydrogen storage materials are one of the principal challenges that must be met before the development of a hydrogen economy. Among all materials studied an important class that could have a future, in particular in portable applications, is the polymers class. Here are reported some results obtained using different polymeric matrices in different operative conditions.

Performances comparison of adsorption hydrogen storage tanks at a wide temperature and pressure zone

The world’s natural gas and crude oil resources are diminishing to the point that gas and petroleum prices are lowering the common man’s standard of living worldwide. Likewise, there is a need for the world to move towards a carbonless energy future to curb the influence of climate change, with increasingly intense climate phenomena observed every year. Subsequently, the search continues for increasingly practical renewable energy sources and effective energy storage methods. Hydrogen, as a clean and abundant energy source, has the highest energy density in terms of mass when excluding nuclear fuels. In terms of the United Nations' Sustainable Development Goals, hydrogen will play a crucial role, specifically in achieving Goal 7, Affordable and Clean Energy, and Goal 13, Climate Action. This study seeks to lay out the current knowledge base of hydrogen energy, focusing on solid-state hydrogen storage. The focus on solid-state hydrogen storage is due to the need for long-term safe storage, which is one of the challenges experienced by hydrogen energy and the hydrogen economy. Moreover, solid-state hydrogen storage offers a potential solution to this challenge. The analysis outlined the current state of hydrogen energy as well as the need for further investigation into metal-hydride-based hydrogen storage while considering the benefits that simulation and machine learning have shown in the field of research. In so doing, it justifies further experimental and simulation-based research into solid-state hydrogen storage using hydride-forming metals. This paper shows that there is not enough published work on large-scale solid-phase hydrogen storage units, as well as the lack of operational machine learning modelling of hydrogen systems. • Deep analysis of metal hydride mechanism • Analysis of optimisation literature. • Analysis of simulation studies • Outlining knowledge gap

Carbon-based materials for Mg-based solid-state hydrogen storage strategies