How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.

Explanation

Some transition metals like palladium (Pd), Platinum (Pt) etc. adsorb a large volume of hydrogen on their surface (as `H^(-)` atoms ) forming hydrides. Due to inclusion of `H-atoms, the metal lattice expands and thus becomes less stable. Therefore, when such metal hydrides are heated, they decompose to release dihydrogen and change back to metallic state in finely divided form. The dihydrogen evolved in this manner can be used as a fuel. Thus, the transition metals or their alloys can be used to store as well as for transportation of dihydrogen used as a fuel.