Hydrogen Storage Alloys

Dear Colleagues,

Hydrogen storage alloy is very important for applications in both solid-state hydrogen storage and nickel-metal hydride batteries. It also makes up the essential components in energy conversion (alkaline fuel cells), chemical processing (reducing agents, strong bases, strong reductants, and catalysts), physical separation processing (desiccants, isotope separation, gas separation, and hydrogen purification), nuclear engineering (neutron moderators, reflectors, and shields), and thermal applications (heat pumps). However, after being provided with many funding opportunities from the United States Department of Energy, the original targets for system gravimetric capacity, 6 and 9 weight %, set for 2010 and 2015, respectively, were never accomplished despite a great deal of research effort. Nevertheless, research on hydrogen storage alloy continues. For example, the main research area for cost reduction in Toyota’s fuel-cell vehicle is in the hydrogen gas supply system. Recently, nickel-metal hydride batteries, with a new family of superlattice A₂B₇ metal hydride alloys, were applied successfully in railways, ferries, telecommunication emergency power sources, and new hybrid-electric vehicles with conventional rare-earth-based AB₅, in China. For this Special Issue in Metals, we welcome reviews and articles in the areas of principle, theoretical calculation, material preparation and characterization, and applications of hydrogen storage alloys.

Dr. Kwo Young
Guest Editor

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• Hydrogen storage alloy

• Solid-state hydrogen storage

• Nickel-metal hydride battery

• Intermetallic compound

• Metallurgy

• Electrochemistry