The feature of the process for ultra-low alloy catalyst loading electrode
according to this invention is to reduce its alloy formation period of
aging process subsequent to hydrogen reduction process of catalyst ions
after ion exchange process of proton for their ions in the cluster of the
polymer electrolyte on the surface of the carbon powder. The process is
able to drastically shorten the aging time with temperature rise beyond
200.degree. C. up to 400.degree. C. under hydrogen atmosphere for the
formation of alloy catalyst, for example Pt--Ru binary by the additional
processes of pre-treatment of substituting K.sup.+, Na.sup.+, Li.sup.+,
Rb.sup.+, Cs.sup.+, Mg.sup.2+, Ca.sup.2+, Ba.sup.2+, Fe.sup.2+,
Sr.sup.2+, Ra.sup.2+, Cu.sup.2+, Ag.sup.+, Zn.sup.2+, Ni.sup.2+, or
Co.sup.2+ for proton before the hydrogen reduction process. The further
post-treatment of substituting K.sup.+, Na.sup.+, Li.sup.+, Rb.sup.+,
Cs.sup.+, Mg.sup.2+, Ca.sup.2+, Ba.sup.2+, Fe.sup.2+, Sr.sup.2+,
Ra.sup.2+, Cu.sup.2+, Ag.sup.+, Zn.sup.2+, Ni.sup.2+, or Co.sup.2+ for
proton before the ion exchange process is more preferable. This new
process is little harmful to the CO tolerance performance of PEFC.