Citation: LI Qing-Wu, WEI Zi-Dong, CHEN Si-Guo, QI Xue-Qiang, LIU Xiao, DING Wei, . PtSnCo/C Anode Catalyst for Methanol Oxidation[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2857-2862. doi: 10.3866/PKU.WHXB20112857 shu

PtSnCo/C Anode Catalyst for Methanol Oxidation

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 Date: 4 May 2011
Available Online: 5 September 2011
Fund Project: 国家自然科学基金(20906107, 20936008) (20906107, 20936008) 重庆大学985 创新人才培养建设计划(101061136) (101061136)中央高校基础研究基金(CDJXS10221141,11132229)资助项目 (CDJXS10221141,11132229)

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.
- Dierct methanol fuel cell,
- PtSnCo/C,
- PtSn/C,
- Stability,
- Methanol oxidation
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