Synthesis and Oxygen Reduction Electrocatalytic Property of Platinum Hollow and Platinum-on-Silver Nanoparticles

被引：143

作者：

Peng, Zhenmeng ^{[1
]}

Wu, Jianbo ^{[1
]}

Yang, Hong ^{[1
]}

机构：

[1] Univ Rochester, Dept Chem Engn, Rochester, NY 14627 USA

来源：

CHEMISTRY OF MATERIALS | 2010年 / 22卷 / 03期

关键词：

CORE-SHELL NANOPARTICLES; FORMIC-ACID OXIDATION; FACILE SYNTHESIS; BIMETALLIC HETERONANOSTRUCTURES; METAL NANOSTRUCTURES; REPLACEMENT REACTION; PD NANOPARTICLES; PT-ALLOY; NANOCRYSTALS; MONOLAYER;

D O I：

10.1021/cm902218j

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：

Pt-on-Ag bimetallic nanoparticles were prepared based on a heterogeneous nucleation and growth method. Interestingly, platinum hollow nanoparticles could be obtained by selectively removing the silver cores from Pt-on-Ag nanoparticles. High-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray (EDX) analysis with a high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM), and X-ray diffraction (XRD) were used to characterize these nanostructures. The observation that Pt hollows can be produced from Pt-on-Ag nanoparticles through the dissolution of Ag metal cores indicates that particle-on-particle nano-dendrites were most likely derived from the products formed through the Stranski-Krastanov (SK) growth. The carbon-supported Pt hollow catalysts, which possessed much higher catalytic activity in oxygen reduction reaction (ORR) than the Pt-on-Ag nanoparticles, were also better than a commercial Pt catalyst (E-tek, 20% Pt). The nanometer-sized textures of the wall of Pt hollow spheres could contribute to the enhancement of the electrocatalytic activity.

引用

页码：1098 / 1106

页数：9

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