Platinum-Ruthenium Nanotubes and Platinum-Ruthenium Coated Copper Nanowires As Efficient Catalysts for Electro-Oxidation of Methanol

被引：152
|
作者：
Zheng, Jie [1 ]
Cullen, David A. [2 ]
Forest, Robert V. [1 ]
Wittkopft, Jarrid A. [1 ]
Zhuang, Zhongbin [1 ]
Sheng, Wenchao [1 ]
Chen, Jingguang G. [3 ]
Yan, Yushan [1 ]
机构：
[1] Univ Delaware, Dept Chem & Biomol Engn, Newark, DE 19716 USA
[2] Oak Ridge Natl Lab, Oak Ridge, TN 37931 USA
[3] Columbia Univ, Dept Chem Engn, New York, NY 10027 USA
来源：
ACS CATALYSIS | 2015年 / 5卷 / 03期
关键词：
methanol fuel cells; electrocatalysis; methanol oxidation reaction; one-dimensional structure; platinum-ruthenium; ENHANCED ELECTROCATALYTIC ACTIVITY; GALVANIC REPLACEMENT REACTION; PROTON-EXCHANGE MEMBRANE; OXYGEN-REDUCTION; PT-RU; FORMIC-ACID; FUEL-CELL; OXIDATION REACTION; ALLOY NANOWIRES; PARTICLES;
D O I：
10.1021/cs501449y
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：
The sluggish kinetics of methanol oxidation reaction (MOR) is a major barrier to the commercialization of direct methanol fuel cells (DMFCs). In this work, we report a facile synthesis of platinum-ruthenium nanotubes (PtRuNTs) and platinum-ruthenium-coated copper nanowires (PtRu/CuNWs) by galvanic displacement reaction using copper nanowires as a template. The PtRu compositional effect on MOR is investigated; the optimum Pt/Ru bulk atomic ratio is about 4 and surface atomic ratio about 1 for both PtRuNTs and PtRu/CuNWs. Enhanced specific MOR activities are observed on both PtRuNTs and PtRu/CuNWs compared with the benchmark commercial carbon-supported PtRu catalyst (PtRu/C, Hispec 12100). X-ray photoelectron spectroscopy (XPS) reveals a larger extent of electron transfer from Ru to Pt on PtRu/CuNWs, which may lead to a modification of the d-band center of Pt and consequently a weaker bonding of CO (the poisoning intermediate) on Pt and a higher MOR activity on PtRu/CuNWs.
引用
收藏
页码：1468 / 1474
页数：7
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