Enhanced activity for oxygen reduction reaction on "Pt 3Co" nanoparticles: Direct evidence of percolated and sandwich-segregation structures

Shuo Chen; Paulo J. Ferreira; Wenchao Sheng; Naoaki Yabuuchi; Lawrence F. Allard; Yang Shao-Horn

doi:10.1021/ja802513y

Enhanced activity for oxygen reduction reaction on "Pt ₃Co" nanoparticles: Direct evidence of percolated and sandwich-segregation structures

Shuo Chen, Paulo J. Ferreira, Wenchao Sheng, Naoaki Yabuuchi, Lawrence F. Allard, Yang Shao-Horn

Nuclear Energy Materials Microanalysis

Research output: Contribution to journal › Article › peer-review

269 Scopus citations

Abstract

Atomically resolved structures and compositions 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 (∼2 times relative to Pt) of acid-treated "Pt₃Co" nanoparticles can be related to composition variations at 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 ∼4 times relative to Pt.

Original language	English
Pages (from-to)	13818-13819
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	130
Issue number	42
DOIs	https://doi.org/10.1021/ja802513y
State	Published - Oct 22 2008

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abstract = "Atomically resolved structures and compositions 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 (∼2 times relative to Pt) of acid-treated {"}Pt3Co{"} nanoparticles can be related to composition variations at 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 ∼4 times relative to Pt.",

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T1 - Enhanced activity for oxygen reduction reaction on "Pt 3Co" nanoparticles

T2 - Direct evidence of percolated and sandwich-segregation structures

AU - Chen, Shuo

AU - Ferreira, Paulo J.

AU - Sheng, Wenchao

AU - Yabuuchi, Naoaki

AU - Allard, Lawrence F.

AU - Shao-Horn, Yang

PY - 2008/10/22

Y1 - 2008/10/22

N2 - Atomically resolved structures and compositions 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 (∼2 times relative to Pt) of acid-treated "Pt3Co" nanoparticles can be related to composition variations at 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 ∼4 times relative to Pt.

AB - Atomically resolved structures and compositions 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 (∼2 times relative to Pt) of acid-treated "Pt3Co" nanoparticles can be related to composition variations at 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 ∼4 times relative to Pt.

UR - http://www.scopus.com/inward/record.url?scp=54249159627&partnerID=8YFLogxK

U2 - 10.1021/ja802513y

DO - 10.1021/ja802513y

M3 - Article

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VL - 130

SP - 13818

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JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 42

ER -

Enhanced activity for oxygen reduction reaction on "Pt ₃Co" nanoparticles: Direct evidence of percolated and sandwich-segregation structures

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