物理化学学报 >> 2011, Vol. 27 >> Issue (12): 2857-2862.doi: 10.3866/PKU.WHXB20112857

电化学和新能源 上一篇    下一篇

甲醇氧化PtSnCo/C阳极催化剂

李庆武, 魏子栋, 陈四国, 齐学强, 柳晓, 丁炜, 马宇   

  1. 重庆大学化学化工学院, 输配电装备及系统安全与新技术国家重点实验室, 重庆 400044
  • 收稿日期:2011-05-04 修回日期:2011-08-25 发布日期:2011-11-25
  • 通讯作者: 魏子栋 E-mail:zdwei@cqu.edu.cn
  • 基金资助:

    国家自然科学基金(20906107, 20936008), 重庆大学985 创新人才培养建设计划(101061136)和中央高校基础研究基金(CDJXS10221141,11132229)资助项目

PtSnCo/C Anode Catalyst for Methanol Oxidation

LI Qing-Wu, WEI Zi-Dong, CHEN Si-Guo, QI Xue-Qiang, LIU Xiao, DING Wei, MAYu   

  1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Chemistry andChemical Engineering, Chongqing University, Chongqing 400044, P. R. China
  • Received:2011-05-04 Revised:2011-08-25 Published:2011-11-25
  • Contact: WEI Zi-Dong E-mail:zdwei@cqu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20906107, 20936008), Innovative Talent Training Project, Chongqing University, China (101061136), and Fundamental Research Funds for the Central University, China (CDJXS10221141, 11132229).

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摘要： 通过乙二醇液相分步还原法制备了金属质量分数为20%的PtSn/C二元及PtSnCo/C三元催化剂. 采用X射线衍射(XRD)光谱法、能量散射谱(EDS)对催化剂进行了表征; 通过阳极线性伏安扫描法(LSV)、连续循环伏安法(CV)、预吸附单层CO 溶出法研究了其电化学性质. 结果表明, PtSnCo/C 三元催化剂较商业化JM-PtRu/C 催化剂具有更好的氧化甲醇催化活性. 循环伏安扫描100 圈后发现, PtSn/C 二元催化剂的甲醇氧化峰电流快速衰减到其初始氧化峰电流的11%左右, 而PtSnCo/C 三元催化剂仅衰减到其初始值的50%左右,这表明PtSnCo/C 三元催化剂具有更好的化学稳定性. 在PtSnCo/C 催化剂上, 甲醇氧化起始电位比直接吸附CO后的CO阳极溶出电位负, 意味着甲醇在PtSnCo/C 催化剂上氧化的中间产物不是CO, 而是比CO更为活泼且易于氧化的中间物种.

关键词: 直接甲醇燃料电池, PtSnCo/C, PtSn/C, 稳定性, 甲醇氧化

Abstract: A binary metallic catalyst (PtSn/C) and a ternary metallic catalyst (PtSnCo/C) with a metal mass fraction of 20% were prepared by borohydride reduction and subsequent hydrothermal treatment in a glycol liquid phase. The structure and composition of the as-prepared electrocatalysts were characterized by X-ray diffraction (XRD) and energy-dispersive spectrometry (EDS). Their activity and stability for the catalysis of methanol oxidation were evaluated by anodic linear sweep voltammetry (LSV), cyclic voltammetry (CV), and the anodic stripping of a pre-adsorbed CO monolayer. We found that the PtSnCo/C catalyst gave the best catalytic activity for the methanol oxidation of all the catalysts including the commercial JM-PtRu/C catalyst. After 100 cycles, the peak current of methanol oxidation for the PtSn/C catalyst rapidly decreased to 11% of its initial peak current but PtSnCo/C decreased to only 50%. This result suggests that the PtSnCo/C catalyst has better chemical stability for the catalysis of methanol oxidation compared to the PtSn/C catalyst. The more negative onset potential of methanol oxidation for the PtSnCo/C catalyst relative to pre-adsorbed CO oxidation implies that the intermediates of methanol oxidation on the PtSnCo/C catalyst may be ones, which can be more easily oxidized than CO, instead of CO.

Key words: Dierct methanol fuel cell, PtSnCo/C, PtSn/C, Stability, Methanol oxidation