催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (8): 765-770.

• 研究论文 • 上一篇    下一篇

Sn(Ⅱ)/Sn(Ⅳ)对PtSn/C乙醇电化学氧化活性的影响

朱明远1,2,孙公权1,李焕巧1,2,曹雷1,2,辛勤1   

  1. 1 中国科学院大连化学物理研究所, 辽宁大连 116023; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-08-25 出版日期:2008-08-25 发布日期:2012-06-20

Effect of the Sn(Ⅱ)/Sn(Ⅳ) Redox Couple on the Activity of PtSn/C for Ethanol Electro-oxidation

ZHU Mingyuan1,2, SUN Gongquan1*, LI Huanqiao1,2, CAO Lei1,2, XIN Qin1   

  1. 1 Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-08-25 Online:2008-08-25 Published:2012-06-20

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910

被引次数

9

摘要： 在乙二醇共还原H2PtCl6和SnCl2的过程中加入Ni(NO3)2作为助剂制备了PtSn/C-Ni催化剂. 程序升温还原实验检测到该催化剂中存在Sn(Ⅱ)/Sn(Ⅳ)氧化还原电对. 线性扫描、单电池性能测试和CO溶出实验表明,提高催化剂中Sn(Ⅱ)/Sn(Ⅳ)的比值能显著提高催化剂的乙醇电化学氧化活性和抗CO中毒能力. 催化剂电催化活性提高的原因可能是Sn(Ⅱ)/Sn(Ⅳ)电对加快了(OH)ads物种在催化剂中的传递速率,促进了乙醇电化学氧化过程中产生的类CO中间物种在Pt表面的氧化.

关键词: 铂, 锡, 负载型催化剂, 直接乙醇燃料电池, 乙醇电化学氧化, 锡氧化还原电对

Abstract: The PtSn/C-Ni catalyst was prepared by adding Ni(NO3)2 in the reduction process of SnCl2 and H2PtCl6 with ethylene glycol. The coexistence of the Sn(Ⅱ)/Sn(Ⅳ) redox couple was detected in the catalyst by temperature-programmed reduction experiments. Linear sweep voltammetry, single cell test, and CO stripping voltammetry experiments showed that the ethanol electro-oxidation activity and CO tolerance can be obviously enhanced by increasing the Sn(Ⅱ)/Sn(Ⅳ) ratio in the catalyst. The reason might be attributed to that the Sn(Ⅱ)/Sn(Ⅳ) redox couple accelerates the transfer rate of (OH)adsand then promotes the consequent oxidation of CO-like intermediates that are produced in the ethanol electro-oxidation process on the surface of Pt.

Key words: platinum, tin, supported catalyst, direct ethanol fuel cell, ethanol electro-oxidation, tin redoxcouple