A novel CO-tolerant PtRu core-shell structured electrocatalyst with Ru rich in core and Pt rich in shell for hydrogen oxidation reaction and its implication in proton exchange membrane fuel cell

JOURNAL OF POWER SOURCES

卷:196

Article

Zhang, Lei¹  Kim, Jenny¹  Chen, Hao Ming²  Nan, Feihong³  Dudeck, Karleen³  Liu, Ru-Shi²  Botton, Gianluigi A.³  Zhang, Jiujun¹ 

[1] Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada

[2] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan

[3] McMaster Univ, Dept Mat Sci & Engn, Hamilton, ON L8S 4M1, Canada

关键词: CO-tolerance;    Electrocatalyst;    Hydrogen oxidation reaction (HOR);    Proton exchange membrane fuel cell;   

DOI  :  10.1016/j.jpowsour.2011.05.020

来源: Elsevier

【 摘 要 】

A novel PtRu catalyst consisting of a Ru-rich core and a Pt-rich shell was synthesized using a two-step microwave irradiation technique. The synthesized PtRu/C catalysts were characterized by X-ray diffraction (XRD), extended X-ray absorption finestructure (EXAFS), transmission electron microscopy (TEM) as well as energy dispersive X-ray spectrometry (EDXS). The produced PtRu/C catalysts showed identical crystalline structure and diffraction peaks to Pt itself, but with negligible higher 2 shift degrees, indicating the formation of a specific composite structure rather than alloy formation. This novel structure of PtRu/C catalyst was also further verified via X-ray absorption spectroscopy. The particle size of PtRu catalysts identified by TEM was less than 5 nm. In order to investigate the CO tolerance in the hydrogen oxidation reaction (HOR). H-2 streams with six different concentrations of CO (0, 10, 50, 100, 300, and 500 ppm) were used. The electrocatalytic activity thus obtained was not only better than that of Pt/C catalyst in HOR, but also showed a better CO tolerance in various CO concentrations. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.

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