Investigation of the oxygen reduction reaction on Pt-WC/C electrocatalysts in alkaline media

被引：30

作者：

Garcia, Amanda C. ^{[1
]}

Ticianelli, Edson A. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

ELECTROCHIMICA ACTA | 2013年 / 106卷

基金：

巴西圣保罗研究基金会;

关键词：

PtWC/C electrocatalysts; Oxygen reduction reaction; Alkaline fuel cell; In situ XANES; HIGH-SURFACE-AREA; TUNGSTEN CARBIDE; O-2; REDUCTION; PLATINUM; CARBON; CATALYST; NANOPARTICLES; MOLYBDENUM; MONOLAYER; ALLOYS;

D O I：

10.1016/j.electacta.2013.05.128

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The activity of Pt catalysts dispersed on tungsten carbide (WC) prepared with a high surface area carbon with two different WC/C ratios is investigated for the oxygen reduction reaction (ORR) in alkaline electrolyte. The electrochemical methods employed are cyclic voltammetry (CV) and steady-state polarization carried out on an ultrathin catalyst layer deposited on the disk of a rotating ring-disk electrode. The PtWC-based catalysts show higher activity for the ORR compared to Pt/C, also involving a transfer of 4 electrons per oxygen molecule. CV and X-ray absorption near edge structure spectroscopy (XANES) results for the PtWC-based materials indicate weaker Pt-OHx interaction in these materials, resulting in a lower Pt-oxide coverage and explaining the increased rate of the ORR, as compared to Pt/C. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：453 / 459

页数：7

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