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炭载Pt-Ag双金属催化剂对甲醇氧化反应的电催化

毕丽晓,刘增花,孔德生,郁章玉*,冯媛媛*   

  1. (曲阜师范大学化学与化工学院 曲阜 273165)
  • 收稿日期:2012-02-21 修回日期:2012-04-16 出版日期:2013-01-10 发布日期:2013-01-10
  • 通讯作者: 郁章玉，教授; Tel/Fax:0537-4458301; E-mail:zyu@mail.qfnu.edu.cn; 研究方向：表面电化学
  • 作者简介: ?
  • 基金资助:
    山东省优秀中青年科学家奖励基金(BS2011NJ009)山东省自然科学基金(ZR2010EM026)资助项目

Carbon-supported Pt-Ag Bimetallic Catalysts for Methanol Electro-Oxidation Reaction

BI Lixiao, LIU Zenghua, KONG Desheng, YU Zhangyu*, FENG Yuanyuan*   

  1. (College of Chemistry and Chemical Engineering,Qufu Normal University,Qufu  273165,China)
  • Received:2012-02-21 Revised:2012-04-16 Published:2013-01-10 Online:2013-01-10

PDF

2215

被引次数

4

摘要： 以NaBH4为还原剂，将K2PtCl6和AgNO3前体进行共还原制备了一系列具有不同组成的碳载PtmAg/C合金催化剂（m为Pt/Ag原子比，m为0.05～1.0），在酸性介质中考察了该系列催化剂对甲醇氧化反应的电催化性能。 与单组分Pt/C催化剂相比，系列PtmAg/C催化剂呈现出较高的催化氧化甲醇的活性与抗CO毒化能力，而且该催化剂的性能与其组成密切相关。 随m值增加，PtmAg/C催化剂对甲醇氧化反应的质量比催化活性(MSA)、本征催化活性(IA)与稳定性均逐步增加，当m=0.5时催化活性达到最高，其MSA和IA分别是Pt/C催化剂的5.1和4.8倍。

关键词: 铂, 银, 去合金, 酸性介质, 甲醇电氧化

Abstract: A series of alloyed PtmAg/C catalysts(m: Pt/Ag atomic ratio, 0.05～1.0) were prepared by the co-reduction of K2PtCl6 and AgNO3 precursors with NaBH4 as the reducing agent. The electrocatalytic performance of the PtmAg/C catalysts for the methanol electro-oxidation was investigated. These PtmAg/C catalysts after electrochemical dealloying treatment in H2SO4 show enhanced catalytic activities for the methanol electro-oxidation and the CO tolerance as compared with the pure Pt/C catalyst, and the catalytic performance is strongly dependent on the catalyst composition(m). The mass-specific activity(MSA), intrinsic activity(IA) and stability of PtmAg/C catalysts increase with increasing m up to 0.5. The MSA and IA of Pt0.5Ag/C catalyst is ca. 5.1 and 4.8 times of that of Pt in Pt/C catalyst, respectively.

Key words: platinum, silver, dealloy, acidic electrolyte, methanol electro-oxidation

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