A nitric acid solution containing ions of any one element selected from
the group consisting of rare element FP of Ru, Rh and Pd and a rare
element of Re is electrolytically reduced by electrolyzing at a constant
current to thereby deposit the ions of the element on an electrode.
Alternatively, a nitric acid solution containing ions of two or more
elements selected from the group consisting of rare element FP of Ru, Rh
and Pd and a rare element of Re is electrolytically reduced by
electrolyzing at a constant current to thereby collectively deposit the
ions of the elements on an electrode. Alkaline water is electrolyzed by
using the thus obtained electrodeposit electrode directly as it is as a
catalytic electrode to efficiently generate hydrogen. Thus, a clean and
sustaining energy system integrating the nuclear energy with the fuel
cell power generation is provided.