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DTIC ADA328073: State-of-the-Art Review of Hydrogen Storage in Reversible Metal Hydrides for Military Fuel Cell Applications.

This report is a comprehensive review of reversible metal hydrides for possible use as hydrogen storage and supply media for proton exchange membrane (PEM) fuel cells. There is considerable interest in using fuel cells for submarine and other military power sources. First presented is a tutorial overview of the phenomenology and important technical properties of metal hydrides, followed by a guide to sources of information on the subject. The main part of the review summarizes the hydriding properties and use potential of the elements, solid-solution alloys and five classes of intermetallic compounds: AB5, AB2, AB, A2B and miscellaneous others. It also briefly reviews the complex (normally nonreversible) hydrides, unconventional alloys and carbon. Emphasis is on hydrides that can use the waste heat of PEM fuel cells (0-100 deg C) to release H2 in the 1-10 atmosphere pressure range, although other hydrides are also partly covered. Although there are many available alloys with useful properties, shortcomings remain especially in the areas of H-capacity, cost and resistance to impurity gases in the H2 used. Further R&D activities aimed at overcoming some of the shortcomings are sugges

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