Oxygen electroreduction on carbon-supported platinum catalysts.: Particle-size effect on the tolerance to methanol competition

被引：177

作者：

Maillard, F ^{[1
]}

Martin, M ^{[1
]}

Gloaguen, F ^{[1
]}

Léger, JM ^{[1
]}

机构：

[1] Univ Poitiers, UMR 6503 CNRS, Equipe Electrocatalyse, F-86000 Poitiers, France

来源：

ELECTROCHIMICA ACTA | 2002年 / 47卷 / 21期

关键词：

carbon-supported platinum nanoparticles; methanol tolerance; oxygen electroreduction; particle-size effect;

D O I：

10.1016/S0013-4686(02)00279-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The kinetics of oxygen reduction in methanol-containing acid electrolyte was investigated at platinum-based electrodes using the porous rotating disk electrodes (KDE) technique. Utilization of commercial-grade (E-TEK) carbon-supported Pt particles with narrow size distribution provided evidences for a particle size effect on the tolerance of oxygen reduction electrocatalysts to methanol competition. In methanol-containing perchloric acid electrolyte, the mass activity (MA, A g(-1) Pt) for oxygen reduction increases continuously with a decrease in particle size from d = 4.6 to 2.3 nm, whereas in methanol-free electrolyte MA is roughly independent of the size, when d less than or equal to 3.5 nm. Effects of addition of a second metal to Pt were also investigated. Based on particle size considerations Pt:Cr-C appears to be a more active catalyst than Pt-C for oxygen reduction in methanol-containing electrolyte. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：3431 / 3440

页数：10

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