Various Pt alloy catalysts have been prepared, and their electrochemical activities have been evaluated. Alloys of Ti, Cr, Mn, Fe, Co, Ni and Ru with Pt have exhibit specific activities than pure Pt. Their mass activities, however, are not increased because of the aggregation of the alloy particles during the heat-treatment process.
A novel preparation process is proposed, achieving the inhibition of the aggregation of the alloy catalysts through the use of a chelating agent. An iron-platinum alloy, prepared with this process, has a smaller particle size and, thus, a high mass activity was obtained.