To improve the volume packing efficiency of a carbon-based hydrogen occlusion material by constituting a porous material from a mixture of metals and a nonmetal in org. material.
Oxides of transition metals such as Fe, Ni, Co having ≤50 nm particle size of the primary particles, or oxides of transition metals mixed with 1 to 10 % volume ratio of fine particles such as aluminum oxide having a smaller particle size than the transition metal oxides are uniformly pulverized and mixed by a ball mill, or the like. Then the mixture is introduced into an electric furnace, and only the transition metal oxides are reduced in a hydrogen atmosphere to obtain a mixture of transition metals and oxides. Then the mixture is formed by sintering or the like. in an inert atmosphere to obtain a porous material having ≥50% porosity. Then, a carbon material such as carbon nanofiber is synthesized in the open pores of the porous body by a thermal CVD method, or the like, in an atmosphere containing hydrocarbon gas such as ethylene gas or carbonic acid gas such as carbon monoxide to obtain a hydrogen occlusion material. A hydrogen occlusion alloy is preferably incorporated into the structural phase of the porous material.
MARUYAMA MIHO
ITSUDO YASUHIRO
