Preparation and Electrochemical Characterization of PtRuO<sub>2</sub>−Ce<sub>0.5</sub>Pr<sub>0.5</sub>O<sub>2−δ</sub>/C Catalysts for Methanol Electrooxidation

The methanol electrooxidation reaction was studied on carbon-dispersed Pt-rare earth oxide nanocatalysts with RuO<sub>2</sub> nanorod in H<sub>2</sub>SO<sub>4</sub>/CH<sub>3</sub>OH solutions. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to characterize PtRuO<sub>2</sub>−Ce<sub>0.5</sub>Pr<sub>0.5</sub>O<sub>2−δ</sub>/C catalysts. The electrochemical activities for the methanol electrooxidation reaction were measured in a powder microelectrode by cyclic voltammetry. The results showed that PtRuO<sub>2</sub>−Ce<sub>0.5</sub>Pr<sub>0.5</sub>O<sub>2−δ</sub>/C exhibited the highest electroactivity and PtRuO<sub>2</sub>−Pr<sub>6</sub>O<sub>11</sub>/C exhibited extremely small current density. Interpretation of trial results was based on the fact that, in contrast to PtRu/C catalysts, PtRuO<sub>2</sub>−Pr<sub>6</sub>O<sub>11</sub>/C catalysts had better ability to dehydrogenate methanol and enhance the effect of the bifunctional mechanism in the methanol oxidation reaction.