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PROBLEM TO BE SOLVED : To realize a clean and maintainable energy system in which nuclear energy and fuel cell power generation are integrated by utilizing the electrodeposits of platinum group elements such as Ru, Rh and Pd as rare elements FP in spent nuclear fuel, and further, of Re as a rare element as a catalyst electrode used for hydrogen production by an alkali water electrolysis. SOLUTION : A nitric acid solution comprising the ions of any one kind of element selected from Ru, Rh and Pd as rare elements FP, and Re as a rare element is subjected to constant current electrolysis and is electrolytically reduced to deposit the above element ions on an electrode. Alternatively, a nitric acid solution comprising the ions of two or more kinds selected from the group consisting of Ru, Rh and Pd as rare elements FP, and Re as a rare element is subjected to constant current electrolysis and is electrolytically reduced, thus the element ions are collectively deposited on an electrode. The electrodeposited electrode obtained in this way is directly used as a catalyst electrode as it is, and alkaline water is electrolyzed to efficiently generate hydrogen.