Deposition of continuous platinum shells on gold nanoparticles by chemical precipitation

被引：25

作者：

Roy, R. K. ^{[1
]}

Njagi, J. I. ^{[1
]}

Farrell, B. ^{[1
]}

Halaciuga, I. ^{[1
]}

Lopez, M. ^{[2
]}

Goia, D. V. ^{[1
]}

机构：

[1] Clarkson Univ, Ctr Adv Mat Proc, Potsdam, NY 13699 USA

[2] Umicore AG & Co KG, D-63403 Hanau, Germany

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2012年 / 369卷

关键词：

Nanocrystals; Platinum; Epitaxial deposition; Fuel cell; OXYGEN REDUCTION; PARTICLE-SIZE; CATALYSTS; CO; ELECTROCATALYSTS; FILMS; NI;

D O I：

10.1016/j.jcis.2011.11.068

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：

Continuous platinum shells consisting of similar to 5 atomic layers were deposited onto preformed gold seeds in aqueous medium by reducing hexachloroplatinic acid with ascorbic acid. By controlling the reduction kinetics of Pt(IV) species and the properties of the substrate, it was possible to ensure a slow and controlled deposition of platinum atoms onto the gold cores. Electrochemical evaluations revealed the presence of a compact platinum shell. The mass specific oxygen reduction activity of platinum in the AuPt core-shell nanoparticles was found to be four times higher than that of platinum black and comparable to that of polycrystalline bulk metal. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：91 / 95

页数：5

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