Octahedral PtNi Nanoparticle Catalysts: Exceptional Oxygen Reduction Activity by Tuning the Alloy Particle Surface Composition

被引：497

作者：

Cui, Chunhua ^{[1
]}

Gan, Lin ^{[1
]}

Li, Hui-Hui ^{[2
]}

Yu, Shu-Hong ^{[2
]}

Heggen, Marc ^{[3
]}

Strasser, Peter ^{[1
]}

机构：

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

[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Div Nanomat & Chem, Hefei 230026, Peoples R China

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

来源：

NANO LETTERS | 2012年 / 12卷 / 11期

关键词：

Surface composition; PtNi octahedra; oxygen reduction reaction; ligand control; FUEL-CELL ELECTROCATALYSTS; SHAPE-CONTROLLED SYNTHESIS; BIMETALLIC NANOPARTICLES; SKIN SURFACES; NANOCRYSTALS; CHEMISTRY; DIFFUSION; FUTURE; SCALE;

D O I：

10.1021/nl3032795

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We demonstrate how shape selectivity and optimized surface composition result in exceptional oxygen reduction activity of octahedral PtNi nanoparticles (NPs). The alloy octahedra were obtained by utilizing a facile, completely surfactant-free solvothermal synthesis. We show that the choice of precursor ligands controls the shape, while the reaction time tunes the surface Pt:Ni composition. The 9.5 nm sized PtNi octahedra reached a 10-fold surface area-specific (similar to 3.14 mA/cm(Pt)(2)) as well as an unprecedented 10-fold Pt mass based (similar to 1.45 A/mg(Pt)) activity gain over the state-of-art Pt electrocatalyst, approaching the theoretically predicted limits.

引用

页码：5885 / 5889

页数：5

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