Electrocatalytic Activity and Stability of Platinum Nanoparticles Supported on Carbon-Molybdenum Oxides for the Oxygen Reduction Reaction

被引：23

作者：

Martins, Pedro F. B. D. ^{[1
]}

Ticianelli, Edson A. ^{[1
]}

机构：

[1] Inst Quim Sao Carlos, Dept Phys Chem, Sao Carlos, SP, Brazil

来源：

CHEMELECTROCHEM | 2015年 / 2卷 / 09期

基金：

巴西圣保罗研究基金会;

关键词：

molybdenum oxide; nanoparticles; oxygen reduction reaction; platinum; catalyst stability; MEMBRANE FUEL-CELLS; METHANOL OXIDATION; CO-TOLERANCE; ALLOY ELECTROCATALYSTS; SURFACE-COMPOSITION; HYDROGEN OXIDATION; DISK ELECTRODE; PT/C; CATALYSTS; INSTABILITY;

D O I：

10.1002/celc.201500196

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The degradation of Pt-based electrocatalysts used in protonexchange membrane fuel cell (PEMFC) cathodes is one of the main issues restricting the widespread application of PEMFCs as energy converters. This work aims to contribute to the improvement of the stability of platinum nanoparticles (Pt NPs) by modifying the support to which they are anchored. Thus, syntheses of catalyst supports based on molybdenum oxides and carbon are carried out, followed by impregnation of the supports with Pt NPs. The Pt/MoO3-C catalyst shows the high-est specific activity in the oxygen reduction reaction (ORR), and this must be because of synergistic metal-support effects. Regarding the electrochemical stability of the materials, it is observed that, in principle, none of the Mo oxides decrease the extent of Pt degradation. However, after comparing the specific ORR activities before and after electrochemical ageing, it is concluded that Pt/MoO2*-C is a more stable material compared to Pt/C and Pt/MoO3-C.

引用

页码：1298 / 1306

页数：9

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