Proper alloying of Pt with underlying Ag nanoparticles leads to dramatic activity enhancement of Pt electrocatalyst

被引：48

作者：

Zhao, Dan ^{[1
]}

Yan, Bing ^{[1
]}

Xu, Bo-Qing ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Innovat Catalysis Program, Beijing 100084, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 06期

基金：

美国国家科学基金会;

关键词：

Pt-based electrocatalyst; Pt-on-Ag nanostructured; Pt-Ag alloy; methanol electro-oxidation; silver nanoparticles;

D O I：

10.1016/j.elecom.2008.04.010

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Nanostructures containing Pt-flecks on Ag colloids (Pt boolean AND Ag) were prepared by Pt deposition from citrate reduction of (PtCl62-)-Cl-IV or (PtCl42-)-Cl-II ions. The nanostructures prepared from (PtCl62-)-Cl-IV showed more or less Pt-Ag alloying d Ue to the galvanic replacement reaction between (PtCl62-)-Cl-IV and metallic Ag colloids. The Pt-Ag alloying at the surface of Ag colloids was manipulated by tuning the atomic Pt/Ag ratio (m) during preparation. It was demonstrated that a proper Pt-Ag alloying in a narrow composition window (0.47 <= m >= 0.53) can led to a dramatic activity enhancement of Pt, up to one order of magnitude higher, for methanol electro-oxidation. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：884 / 887

页数：4

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