Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (12): 2857-2862.doi: 10.3866/PKU.WHXB20112857

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

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
  • 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).

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


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