Bifunctional electrocatalysis in pt-ru nanoparticle systems

Langmuir : the ACS Journal of Surfaces and Colloids
C RothD J Schiffrin

Abstract

Pt-Ru alloys are prominent electrocatalysts in fuel cell anodes as they feature a very high activity for the oxidation of reformate and methanol. The improved CO tolerance of these alloys has been discussed in relation to the so-called ligand and bifunctional mechanisms. Although these effects have been known for many years, they are still not completely understood. A new approach that bridges the gap between single crystals and practical catalysts is presented in this paper. Nanoparticulate model systems attached to an oxidized glassy carbon electrode were prepared by combining both ligand-stabilized and spontaneously deposited Pt and Ru nanoparticles. These electrodes showed very different voltammetric responses for CO and methanol oxidation. The cyclic voltammograms were deconvoluted into contributions attributed to Pt, Ru, and Pt-Ru contact regions to quantify the contribution of the latter to the bifunctional mechanism. Scanning transmission electron microscopy confirmed the proximity of Pt and Ru nanoparticles in the different samples.

References

Jan 30, 1999·Journal of Colloid and Interface Science·W YuJ Zheng
Jan 17, 2002·Journal of the American Chemical Society·YuYe TongEric Oldfield
Jun 25, 2004·Chemical Communications : Chem Comm·C RothD J Schiffrin
Apr 19, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Lawrence Yoon Suk LeeR Bruce Lennox
Jul 21, 2006·The Journal of Physical Chemistry. B·F MaillardU Stimming
Sep 1, 2006·The Journal of Physical Chemistry. B·Hongzhou YangShouzhong Zou

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Citations

Sep 17, 2009·Physical Chemistry Chemical Physics : PCCP·Bingchen DuYuYe Tong
May 5, 2012·Physical Chemistry Chemical Physics : PCCP·Dongshuang WuRong Cao
Jul 28, 2010·Luminescence : the Journal of Biological and Chemical Luminescence·Wei CaiGuangyi Shang
Dec 3, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Weiwei HeSishen Xie

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