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Solid-state hydrogen storage goes electric
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DOI：10.1126/science.aeb3327.png)
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Abstract
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Broad adoption of hydrogen as a versatile energy carrier is primarily hampered by a lack of safe and compact hydrogen storage. Hydrogen is often stored as compressed gas or cryogenic liquid, which requires high pressures or extremely low temperatures. Metal hydrides—compounds in which hydrogen is chemically bonded to solid metallic or intermetallic hosts—can store hydrogen with a high volumetric density (1). The inherent thermodynamic stability of these solid-state storage compounds provides safety but also requires impractically high temperatures for hydrogen release. On page 1252 of this issue, Hirose et al. (2) report an approach that electrochemically “pumps” hydrogen in the form of hydride ions (H⁻) through a solid electrolyte into or out of a metal hydride. This elegantly circumvents the requirement of high temperature to free hydrogen from the metal hydride, offering a pathway to harness high-capacity hydrogen storage under practical release conditions.
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