Abstract
Stability of four kinds of commercially available Pt-Ru/C (Pt:Ru = 1:1 for Samples A1, B1, and C1, and Pt:Ru = 1:2 for Sample B2) anode catalysts was investigated in 0.5 M H2SO4 by potential cycling. When the upper limit was set at potentials higher than 0.4 V, all Pt-Ru(1:1)/C samples were unstable and Ru concentration on the surface decreased during potential cycling tests. The degradation rate increased with increasing the upper potential limit. On the other hand, Samples A1 and B1 showed different tendencies in stability in the potential range of 0.05 to 0.2 V, depending on the crystallinity and the surface state (e.g. the presence of RuOx). Sample B2 (Pt:Ru = 1:2) had a higher stability than Sample B1 (Pt:Ru = 1:1) at high potentials > 0.4 V. On the contrary, the former had an inferior stability in the potential range of 0.05 to 0.2 V.
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