Abstract
Substoichiometric titanium oxide -supported Pt catalysts were prepared and their electrochemical properties, particularly the effects of high-potential conditions on the activity and stability of catalysts, were compared to those of catalyst. Polarization measurements using membrane electrode assemblies revealed that the cathode shows a similar activity for the oxygen reduction reaction as catalyst at . A high-potential holding test ( holding at vs anode) demonstrated that the catalyst is quite stable against high potential up to . A single cell using a cathode was operated at , and voltage stability for with was also demonstrated.
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