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AC impedance investigation of plating potentials on the catalytic activities of Pt nanocatalysts for methanol electrooxidation

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Abstract

Pt nanocatalysts supported on glassy carbon (GC) were electrochemically deposited by cyclic voltammetry (CV) with different scanning potential ranges. The lower limit of potential was fixed at −0.25 V vs. saturated calomel electrode, whereas the upper limit of potential was adjusted to be 0.0, 0.20, 0.60, and 1.0 V. Scanning electron microscopy images showed that Pt microparticles are uniformly dispersed on the GC substrate and the agglomerated microparticles are composed of numerous nanoparticles. In addition, the catalytic capabilities of Pt/GCs for methanol electrooxidation were examined by CV, chronoamperometry, and electrochemical impedance spectroscopy in a solution of 0.5 M CH3OH and 0.5 M H2SO4. The results demonstrate that the catalytic activities and stabilities of Pt catalysts prepared by the potential ranges from −0.25 to both 0.60 and 1.0 V for methanol electrooxidation were higher than the others, which may be due to their higher electrochemical active surface area, lower charge transfer resistance, and more preferred Pt crystallographic orientation.

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Acknowledgements

This work is supported by a grant from the Key Program of Basic Research of the Shanghai Committee of Science and Technology, China (grant no. 08JC1402000).

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Authors and Affiliations

  1. Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, 220 Handan Road, Shanghai, 200433, China

    Tao Huang, Rongrong Jiang, Deng Zhang, Jihua Zhuang, Wenbin Cai & Aishui Yu

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  1. Tao Huang
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  2. Rongrong Jiang
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  3. Deng Zhang
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Correspondence to Aishui Yu.

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Huang, T., Jiang, R., Zhang, D. et al. AC impedance investigation of plating potentials on the catalytic activities of Pt nanocatalysts for methanol electrooxidation. J Solid State Electrochem 14, 101–107 (2010). https://doi.org/10.1007/s10008-009-0795-4

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  • DOI: https://doi.org/10.1007/s10008-009-0795-4

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