物理化学学报 >> 2011, Vol. 27 >> Issue (03): 711-716.doi: 10.3866/PKU.WHXB20110327

催化和表面科学 上一篇    下一篇

CMK-5负载Pt-Ni合金催化剂及其甲醇电化学氧化性能

丁晓春, 陈秀, 周建华, 王涛, 孙盾, 何建平   

  1. 南京航空航天大学材料科学与技术学院, 南京 210016
  • 收稿日期:2010-10-27 修回日期:2011-01-10 发布日期:2011-03-03
  • 通讯作者: 何建平 E-mail:jianph@nuaa.edu.cn
  • 基金资助:

    国家自然科学基金(50871053)资助项目

Pt-Ni Catalyst Supported on CMK-5 for the Electrochemical Oxidation of Methanol

DING Xiao-Chun, CHEN Xiu, ZHOU Jian-Hua, WANG Tao, SUN Dun, HE Jian-Ping   

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
  • Received:2010-10-27 Revised:2011-01-10 Published:2011-03-03
  • Contact: HE Jian-Ping E-mail:jianph@nuaa.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50871053).

摘要:

采用NaBH4还原法将不同原子比的铂镍负载于CMK-5(由SBA-15模板所得的碳载体)表面. X射线衍射(XRD)和X射线光电子能谱(XPS)测试结果表明, 所得催化剂是以铂镍合金的形式存在, 相对于Pt/CMK-5而言, 这种合金化的催化剂中Pt表现出更多的金属态. 电化学测试结果显示, 在催化剂中主要以化合态存在的镍(包括NiO、Ni(OH)2和NiOOH)可能更有利于甲醇的吸附和氧化产物从催化剂表面的脱附. 另外, 从循环伏安测试结果可知, Pt-Ni/CMK-5 (5:1)(原子比)具有较大的比表面活性, 其电化学活性面积高达63.9 m2·g-1, 且与Pt/CMK-5相比抗CO中毒能力有明显改善.

关键词: CMK-5, Pt/CMK-5催化剂, Pt-Ni/CMK-5催化剂, 甲醇, 电化学氧化

Abstract:

Pt-Ni alloy catalysts with different atomic ratios were deposited on CMK-5 (carbon replicated from SBA-15 silica) by NaBH4 reduction. X-ray diffraction (XRD) suggests alloy formation between Pt and Ni. X-ray photoelectron spectroscopy (XPS) shows that Pt-Ni/CMK-5 (5:1) has more detectable oxidized Ni. More metallic Pt is present on Pt-Ni/CMK-5 (5:1) (atomic ratio) than on Pt/CMK-5. Oxidized Ni species, such as NiO, Ni(OH)2, and NiOOH, favor the adsorption of methanol and the dissociation of methanol from the surface of Pt. Cyclic voltammetry shows that Pt-Ni/CMK-5 (5:1) has the highest specific activity among the as-made catalysts and its electrochemical active area is 63.9 m2·g-1. It has more resistance to CO poisoning than Pt/CMK-5.

Key words: CMK-5, Pt/CMK-5 catalyst, Pt-Ni/CMK-5 catalyst, Methanol, Electrooxidation

MSC2000: 

  • O646