Abstract
Abstract Graphite-based Pt electrodes were combined with metal-oxide-supported ultrafine Au particles (diameter C Fe 2 O 3 + Au + Pt electrodes exhibited much higher catalytic activity than the electrodes without Au particles, namely graphite-based Pt ( C Pt ) or graphite-based Pt + α- Fe 2 O 3 ( C Fe 2 O 3 + Pt ) electrodes. The electro-oxidation of CH3OH on the C Fe 2 O 3 + Au + Pt and C Fe 2 O 3 ( Ti-doped ) + Au + Pt electrodes was deactivated to much less than that on either C Pt or C Fe 2 O 3 + Pt electrodes by continuous bubbling of CO. Rather, the apparent activity was increased due to superimposed CO electro-oxidation, particularly at potentials below 500 mV/RHE. The enhancement of activity by oxide-supported Au particles can be attributed to the electro-oxidative removal of CO-like carbonaceous intermediates which were produced by the partial oxidation of CH3OH.
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