Electrochemical Utilization of Metal Hydrides

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Abstract
Fundamental and applied works involving the electrochemical utilization of metal hydrides are reviewed. In the first part of the paper, studies that investigated metal hydrides for hydrogen storage in nickel hydrogen batteries are reviewed. These studies showed that use of hydrides lowered the operating pressures in nickel hydrogen cells, which could lead to improved energy density. However, results regarding degradation of the hydriding material in an aqueous medium were conflicting. In the second part of the paper, the use of metal hydrides as reversible hydrogen electrodes is discussed. Studies reviewed included thermodynamic and kinetic investigations of a variety of hydriding materials. Conflicting results among studies are reconciled where possible, and conclusions are drawn regarding the feasibility of electrochemical utilization of metal hydrides, with suggestions for further work.

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