Unravelling the complexities of CO2 tolerance at PtRu/C and PtMo/C

被引：25

作者：

Russell, Andrea E. ^{[1
]}

Ball, Sarah C. ^{[1
]}

Maniguet, Stephanie ^{[1
]}

Thompsett, David ^{[1
]}

机构：

[1] Univ Southampton, Southampton SO9 5NH, Hants, England

来源：

JOURNAL OF POWER SOURCES | 2007年 / 171卷 / 01期

关键词：

PEM fuel cell; anode catalyst; CO tolerance; CO2; tolerance; reformate;

D O I：

10.1016/j.jpowsour.2007.02.050

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：

The CO2 tolerance exhibited by PtRu/C is known to be greater than that of PtMo/C catalysts in contrast to the trend in CO tolerance. In this manuscript the origins of these differences are investigated in a cyclic voltammetric investigation of the potential dependence of the poisoning of Pt/C, PtRu/C and PtMo/C anode catalyst electrodes in a miniature PEM fuel cell when exposed to pure CO, pure CO2, or 25% CO2 in H-2. The results show that the difference in the mechanisms of improved CO tolerance, compared to a Pt/C reference catalyst, of PtRu and PtMo explain the decreased CO2 tolerance of PtMo compared to PtRu; at PtRu the mechanism is intrinsic (water activation at Ru sites), whilst at PtMo the mechanism relies on the turn-over the Mo(IV/VI) redox couple. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：72 / 78

页数：7

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