Abstract
An unsupported Pt75Ru25 powder was synthesized by co-reducing the corresponding precursor salts rapidly. An alloy powder of Pt75Ru25 composition was formed in this manner. The catalyst powders were subjected to various electrochemical treatments in either 0.5 M H2SO4 or 0.5 M CH3OH + 0.5 M H2SO4 solutions. Applying specific electrochemical treatments in respect to time (e.g., the potential cycling number) relative to the E+ value result in either a decrease or increase in the CH3OH oxidation activity of this catalyst. The differently treated catalyst powders were further studied using EDX, XPS and CO adsorbed (COads) stripping voltamograms and transients. The results suggest that removal of surface Ru-oxides result in an increase in CH3OH electro-oxidation activity, while extensive loss of Ru from the catalyst surface results in a decrease in CH3OH oxidation activity. Refluxing this as-prepared catalyst powder in an excess of boiling 0.5 M H2SO4 did neither result in the removal of the surface Ru-oxides nor improve the CH3OH oxidation activity.
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