Oxygen Reduction Kinetics on Electrodeposited PtCo as a Model Catalyst for Proton Exchange Membrane Fuel Cell Cathodes: Stability as a Function of PtCo Composition

被引：28

作者：

Jayasayee, Kaushik ^{[1
]}

Dam, Van Anh T. ^{[1
]}

Verhoeven, Tiny ^{[1
]}

Celebi, Serdar ^{[1
]}

de Bruijn, Frank A. ^{[1
,2
]}

机构：

[1] Eindhoven Univ Technol, Inorgan Chem & Catalysis Grp, NL-5600 MB Eindhoven, Netherlands

[2] Energy Res Ctr Netherlands ECN, NL-1755 ZG Petten, Netherlands

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 47期

关键词：

CO ALLOY CATALYSTS; PT3CO ALLOY; ELECTROCATALYSIS; SURFACES; NANOPARTICLES; ENHANCEMENT; SIZE; FE; NI;

D O I：

10.1021/jp904762e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

PtCo catalysts with composition varying between Pt80Co20 and Pt10Co90 were prepared by electrochemical underpotential codeposition. The bimetallic catalysts were subjected to 1000 electrochemical cycles in 0.5 M HClO4 at room temperature. The activity and stability of these electrodes for oxygen reduction was determined, in conjunction with the characterization of these catalysts with energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. Although Pt-rich electrodes had better activity in the initial stages of potential cycling, higher Co atomic ratios led to higher stability and higher oxygen reduction reaction (ORR) activity after electrochemical cycling. Pt10Co90 turned out to be the best electrode among the alloys considered, in terms of ORR activity and stability, which is linked to a higher concentration of Co on the surface.

引用

页码：20371 / 20380

页数：10

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