HYDROGEN STORAGE MATERIAL

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PROBLEM TO BE SOLVED : To provide a lightweight and inexpensive hydrogen storage material easy to activate. SOLUTION : The hydrogen storage material is expressed by a composition formula, (Ca1-xAx)1-z(Si1-yy)z{A is at least one member selected from the group consisting of alkali metal elements, alkaline-earth metal elements, rare-earth elements, the elements of group 3 through 6, Ni, Au, In, Tl, Sn, Fe, Co, Cu and Ag; B is at least one member selected from the group consisting of the elements of groups 7 through 17 elements, rare-earth elements, Hf and Be; 0≤x<1 by atomic ratio; 0≤y<1 by atomic ratio; and 0.38≤z≤0.58 by atomic ratio}. It is lightweight as well as less expensive. In principle, neither high-temperature nor high-pressure activation is required, because it exhibits a high initial activity. The operation temperature can be lowered and the hydrogen absorption content can be increased by controlling the kind and substitution proportion of the substituent elements appropriately.