Enhanced activity for oxygen reduction reaction on "Pt3CO" nanoparticles:: Direct evidence of percolated and sandwich-segregation structures

被引：259

作者：

Chen, Shuo ^{[1
]}

Ferreira, Paulo J. ^{[2
]}

Sheng, Wenchao ^{[1
]}

Yabuuchi, Naoaki ^{[1
]}

Allard, Lawrence F. ^{[3
]}

Shao-Horn, Yang ^{[1
]}

机构：

[1] MIT, Electrochem Energy Lab, Cambridge, MA 02139 USA

[2] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2008年 / 130卷 / 42期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1021/ja802513y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Atomically resolved structures and composition of Pt alloy nanoparticles were obtained using aberration-corrected high-angle dark field imaging, which was correlated to specific ORR activity based on a Pt surface area. The enhanced specific ORR activity (similar to 2 times relative to Pt) of acid-treated "Pt3Co" nanoparticles can be related to composition variations at the atomic scale and the atomic scale and the formation of percolated Pt-rich and Pt-poor regions within individual particles. Upon annealing, we show direct evidence of surface Pt sandwich-segregation structures, which correspond to a specific ORR activity similar to 4 times relative to Pt.

引用

收藏

页码：13818 / 13819

页数：2

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