Enhancing hydroxyl adsorption for methanol oxidation reaction (MOR) of Pt-loaded on carbon support 3D network Magnéli phase V4O7 composite

Abstract

Carbon-composited 3D network V-O Magnéli compounds V4O7-C were prepared through the colloid-impregnation-carbonthermic method. After Pt nanoparticles loading, electrocatalysts for the methanol oxidation reaction (MOR) with different Pt contents Pt/V4O7-C were obtained. The specific activity of 15% Pt/V4O7-C was 3847 mA/g, which was 2.4 times that of commercial Pt/C. After 3000s durability tests the 15% Pt/V4O7-C had a stability similar to the Pt/C (38% activity retention), and the 20% Pt/V4O7-C showed better durability (45% activity retention) than commercial materials. XPS results implied that a strong metal-support interaction occurred between the Pt and V4O7-C, which may enhance the MOR performance. Moreover, a designed CO stripping experiment proved that V4O7 could enhance the adsorption of OH− and the oxidation reaction of intermediates and restrain the adsorption of carbonyl species of MOR. The synergistic effect between Pt and V4O7-C was summarized. The interaction between Pt and Magnéli oxides may provide a new idea for the design of high performance catalytic materials for electrocatalytic oxidation in the view of the adsorption of the reaction species.