Iridium-Ruthenium Alloyed Nanoparticles for the Ethanol Oxidation Fuel Cell Reactions

被引:44
作者
Du, Wenxin [1 ]
Deskins, Nathaniel A. [2 ]
Su, Dong [3 ]
Teng, Xiaowei [1 ]
机构
[1] Univ New Hampshire, Dept Chem Engn, Durham, NH 03824 USA
[2] Worcester Polytech Inst, Dept Chem Engn, Worcester, MA 01609 USA
[3] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA
来源
ACS CATALYSIS | 2012年 / 2卷 / 06期
关键词
Ir-Ru nanoparticle; alloy; ethanol oxidation reaction; DFT calculations; PT-RU ALLOYS; METHANOL ELECTROOXIDATION; QUANTITATIVE DEMS; ANODE CATALYSTS; ELECTROCATALYSTS; ELECTRODES; REDUCTION; PLATINUM; TECHNOLOGY;
D O I
10.1021/cs3002308
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
In this study, carbon supported Ir-Ru nanoparticles with average sizes ranging from 2.9 to 3.7 nm were prepared using a polyol method. The combined character- so ization techniques, that is, scanning transmission electron 7F. 40 microscopy equipped with electron energy loss spectroscopy, 2 high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction, were used to determine an Ir-Ru alloy nanostructure. Both cyclic voltammetry and chronoamperometry (CA) results demonstrate that Ir77Ru23/C bears superior catalytic activities for the ethanol oxidation reaction compared to Ir/C and commercial Pt/C catalysts. In particular, the Ir77Ru23/C catalyst shows more than 21 times higher mass current density than that of Pt/C after 2 h reaction at a potential of 0.2 V vs Ag/AgCl in CA measurement. Density functional theory simulations also demonstrate the superiority of Ir-Ru alloys compared to Ir for the ethanol oxidation reaction.
引用
收藏
页码:1226 / 1231
页数:6
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