Probing The Structure Of Operating Fuel Cell Cathode Catalysts Using XAS

被引：3

作者：

Hudson, S. L. ^{[1
]}

Ball, S. C. ^{[1
]}

Blaney, K. B. ^{[1
]}

Chouchelamane, G. H. ^{[1
]}

Fiddy, S. G. ^{[1
]}

Harvey, I. ^{[1
]}

Sivasubramaniam, P. ^{[1
]}

Tessier, B. C. ^{[1
]}

Theobald, B. R. C. ^{[1
]}

Thompsett, D. ^{[1
]}

Russell, A. E. ^{[1
]}

机构：

[1] Johnson Matthey Technol Ctr, Blounts Court,Sonning Common, Reading RG4 9NH, Berks, England

来源：

PROTON EXCHANGE MEMBRANE FUEL CELLS 8, PTS 1 AND 2 | 2008年 / 16卷 / 02期

关键词：

D O I：

10.1149/1.2981980

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：

A proton exchange membrane fuel cell has been designed to enable correlation of cathode catalytic activity with structural parameters determined by in situ XAS investigations in transmission mode. The cell design is described and validated for oxygen reduction activity measurement using both Pt and PtCo alloy catalysts. Findings from in situ XAS investigations at the Pt Ln, edge are presented for a 60% Pt/C cathode catalyst operating at OCV, under load with oxygen feed, and during time resolved potential step experiments with oxygen and nitrogen feeds. In nitrogen XANES and EXAFS analysis show increasing oxide formation and particle disruption with increasing potential up to 1.0 V. In oxygen the catalyst structure remained unchanged irrespective of the applied potential and therefore load drawn from the cell. Differences in coordination number at the same applied potential in oxygen compared to nitrogen indicate that a particle morphology change occurs during the ORR.

引用

页码：1395 / +

页数：3

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