Durability of Pt3Co/C nanoparticles in a proton-exchange membrane fuel cell: Direct evidence of bulk Co segregation to the surface

被引：104

作者：

Maillard, F. ^{[1
]}

Dubau, L. ^{[1
]}

Durst, J. ^{[1
]}

Chatenet, M. ^{[1
]}

Andre, J. ^{[2
]}

Rossinot, E. ^{[2
]}

机构：

[1] Grenoble Univ, CNRS, UMR 5631, Lab Electrochim & Physicochim Mat & Interfaces, F-38402 St Martin Dheres, France

[2] Axane, F-38360 Sassenage, France

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2010年 / 12卷 / 09期

关键词：

Pt3Co; Durability; PEMFC; ORR; Pt-skeleton; Pt-skin; OXYGEN REDUCTION REACTION; ALLOY CATALYSTS; SANDWICH-SEGREGATION; STABILITY; ELECTROCATALYSIS; DEGRADATION;

D O I：

10.1016/j.elecom.2010.06.007

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Pt3Co/C electrocatalysts are not stable when operated in real PEMFC conditions but face variations of their chemical composition. The latter signs that Co atoms can segregate from the bulk to the surface of the nanoparticles, which we believe is activated by the formation of surface oxides and the leaching of Co at the surface. Consequently, the alloyed Pt3Co/C nanoparticles slowly evolve towards Pt shell/Pt-Co alloy core structures with depleted Co content and a Pt-enriched shell. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1161 / 1164

页数：4

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