The Effect of the Surface Composition of Ru-Pt Bimetallic Catalysts for Methanol Oxidation

被引：38
作者：
Garrick, Taylor R. [1 ]
Diao, Weijian [1 ]
Tengco, John M. [1 ]
Stach, Eric A. [3 ]
Senanayake, Sanjaya D. [4 ]
Chen, Donna A. [2 ]
Monnier, John R. [1 ]
Weidner, John W. [1 ]
机构：
[1] Univ S Carolina, Dept Chem Engn, Ctr Electrochem Engn, Columbia, SC 29208 USA
[2] Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA
[3] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11963 USA
[4] Brookhaven Natl Lab, Dept Chem, Upton, NY 11963 USA
来源：
ELECTROCHIMICA ACTA | 2016年 / 195卷
关键词：
Electrochemical; Catalysts; Bimetallic; Methanol oxidation; ELECTROOXIDATION; ALLOYS; ELECTROCATALYSTS; HYDROGENATION; PLATINUM;
D O I：
10.1016/j.electacta.2016.02.134
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A series of Ru-Pt bimetallic catalysts prepared by the electroless deposition of controlled and variable amounts of Ru on the Pt surface of a commercially-available 20 wt% Pt/C catalyst has been characterized and evaluated for the oxidation of methanol. The activity of each Ru-Pt catalyst was determined as a function of surface composition via cyclic voltammetry. For the Ru-Pt bimetallic catalysts, activity passed through a maximum at approximately 50% monodisperse Ru surface coverage. However, due to the monolayer coverage of Ru on Pt, the amount of metal in the catalyst is minimized compared to a bulk 1: 1 atomic ratio of Ru: Pt seen in commercial bimetallic catalysts. Chemisorption and temperature programmed reduction experiments confirmed that the surface had characteristics of a true bimetallic catalyst. On a mass of Pt basis, the activity of this composition for methanol oxidation was 7 times higher than pure Pt and 3.5 times higher than a commercial catalyst with a 1: 1 Pt: Ru bulk atomic ratio. (C) 2016 Elsevier Ltd. All rights reserved.
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页码：106 / 111
页数：6
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