Core-Shell Compositional Fine Structures of Dealloyed PtxNi1-x Nanoparticles and Their Impact on Oxygen Reduction Catalysis

被引：324

作者：

Gan, Lin ^{[1
]}

Heggen, Marc ^{[2
]}

Rudi, Stefan ^{[1
]}

Strasser, Peter ^{[1
,3
]}

机构：

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

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

[3] Gwanju Inst Sci & Technol, Ertl Ctr Electrochem & Catalysis, Gwanju 500712, South Korea

来源：

NANO LETTERS | 2012年 / 12卷 / 10期

关键词：

Pt-bimetallic catalyst; core shell nanoparticles; oxygen reduction reaction; aberration-corrected scanning transmission electron microscopy; electron energy loss spectroscopy; PLATINUM-MONOLAYER ELECTROCATALYSTS; FUEL-CELL ELECTROCATALYSTS; PT-SKIN SURFACES; NIXPT1-X NANOPARTICLES; ELECTRONIC-STRUCTURE; O-2; REDUCTION; ALLOY; DISSOLUTION; METAL; NI;

D O I：

10.1021/nl302995z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Using aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy line profiles with Angstrom resolution, we uncover novel core-shell fine structures in a series of catalytically active dealloyed PtxNi1-x core-shell nanoparticles, showing the formation of unusual near-surface Ni-enriched inner shells. The radial location and the composition of the Ni-enriched inner shells were sensitively dependent on the initial alloy compositions. We further discuss how these self-organized Ni-enriched inner shells play a key role in maintaining surface lattice strain and thus control the surface catalytic activity for oxygen reduction.

引用

页码：5423 / 5430

页数：8

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