Identical locations transmission electron microscopy study of Pt/C electrocatalyst degradation during oxygen reduction reaction

被引：105

作者：

Perez-Alonso, Francisco J. ^{[1
]}

Elkjaer, Christian F. ^{[1
]}

Shim, Signe S. ^{[1
,2
]}

Abrams, Billie L. ^{[1
]}

Stephens, Ifan E. L. ^{[1
]}

Chorkendorff, Ib ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Phys, Ctr Individual Nanoparticle Funct, DK-2800 Lyngby, Denmark

[2] IRD Fuel Cells AS, DK-5700 Svendborg, Denmark

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 15期

基金：

新加坡国家研究基金会;

关键词：

Oxygen reduction; Identical locations transmission electron microscopy; Platinum; Corrosion; Fuel cell; PROTON-EXCHANGE MEMBRANE; FUEL-CELL; PLATINUM DISSOLUTION; CATALYST DEGRADATION; LAYER DEGRADATION; CATHODE CATALYST; DURABILITY; MODEL; NANOPARTICLES; DEPOSITION;

D O I：

10.1016/j.jpowsour.2011.03.064

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 degradation mechanisms of Pt nanoparticles supported on Carbon have been characterized during oxygen reduction reaction (ORR) conditions using IL-TEM. A TEM grid is used as the sole working electrode allowing a direct correlation between the electrochemical response and the TEM analysis. We mainly observe a decrease in nanoparticle size with some particle disappearance and some particle sintering after potential cycling simulating the start-up and shut-down of a fuel cell. The observation of nanoparticles with reduced particle size provides evidence that dissolution phenomena are the main cause of degradation in Pt/C electrocatalysts, under ORR conditions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：6085 / 6091

页数：7

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