Formation and Analysis of Core-Shell Fine Structures in Pt Bimetallic Nanoparticle Fuel Cell Electrocatalysts

被引：93

作者：

Heggen, Marc ^{[1
]}

Oezaslan, Mehtap ^{[2
]}

Houben, Lothar ^{[1
]}

Strasser, Peter ^{[2
]}

机构：

[1] Forschungszentrum Juelich GmbH, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany

[2] Tech Univ Berlin, Dept Chem, Electrochem Energy Catalysis & Mat Sci Lab, D-10623 Berlin, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 36期

关键词：

OXYGEN REDUCTION REACTION; ELECTRONIC-STRUCTURE; SURFACE SEGREGATION; PT3CO NANOPARTICLES; TRANSITION-METALS; ALLOY SURFACES; STRAIN; KIRKENDALL; CATALYSTS; REACTIVITY;

D O I：

10.1021/jp306426a

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：

An Angstrom-scale structural and compositional investigation of a dealloyed Pt-Co core-shell nanoparticle fuel cell catalyst with characteristic diameter of 10-15 nm in an early stage of its life cycle reveals unusual self-organized compositional subsurface fine structure, that is, subsequent shells of Co depletion and enrichment. The origin of the unusual structure is rationalized by interplay of Co dissolution, Pt surface diffusion, and an inverse Kirkendall effect. A detailed picture about the chemical composition of the surface and subsurface provides a fundamental insight into the catalytically active structure of bimetallic electrocatalysts.

引用

页码：19073 / 19083

页数：11

共 53 条

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Abel N., 1826, J. Reine Angew. Math., V1, P153, DOI DOI 10.1515/CRLL.1826.1.153

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