Abstract
The hydrogenation of aluminum is inhibited by the slow diffusion of hydrogen in its hydride AlH3, which covers the surface of aluminum in the initial stages of the reaction. Thus, permeation pathways for hydrogen are introduced by either mixing aluminum powder with boron nitride powder or alloying aluminum with gallium at 10 at. % Ga. The aluminum in the composite or alloy is reacted with hydrogen at high pressure and temperature. In both cases, the hydrogenation reaction yields are significantly enhanced, confirming that boron nitride and the liquid phase produced by partial melting of the alloy work efficiently as hydrogen permeation pathways.
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