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Electrochemical impedance analysis of methanol oxidation on carbon nanotube-supported Pt and Pt-Ru nanoparticles

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Abstract

Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are employed to investigate methanol oxidation reactions on single-walled carbon nanotube-supported platinum (Pt) and platinum–ruthenium (Pt-Ru) nanoparticles. EIS and CV measurements show consistent results: Pt catalyst supported on single-walled carbon nanotubes possesses higher catalytic activity for methanol oxidation than that on carbon black. Additionally, semicircles in the second quadrant of the Nyquist diagrams are observed for methanol oxidation on all types of catalytic nanoparticles when applying an electrical potential of 600 mV, which indicates the occurrence of negative resistance during electrocatalytic methanol oxidations. However, all impedance spectra show positive resistance at other electrode potentials (e.g., 300, 400, and 800 mV). Electrocatalytic characteristics of all catalysts are further analyzed by equivalent circuit simulations. We propose that intermediate coverage on the catalyst surface and subsequently the oscillation of nonlinear electrochemical methanol oxidations lead to the occurrence of negative resistance at 600 mV.

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Acknowledgments

This work was partially supported by the Faculty Research Grant and a Sabbatical Leave Award from Missouri State University, the National Natural Science Foundation of China (51172113), the Shandong Natural Science Foundation for Distinguished Young Scholars (JQ201118), the Qingdao Municipal Science and Technology Commission (12-1-4-136-hz), and the Taishan Overseas Scholar program from the Shandong Province Government, People’s Republic of China.

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Authors and Affiliations

  1. Department of Physics, Astronomy and Materials Science, Missouri State University, Springfield, MO, 65897, USA

    Bo Ma, Jincheng Bai & Lifeng Dong

  2. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Jincheng Bai & Lifeng Dong

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  1. Bo Ma
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  2. Jincheng Bai
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  3. Lifeng Dong
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Correspondence to Lifeng Dong.

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Ma, B., Bai, J. & Dong, L. Electrochemical impedance analysis of methanol oxidation on carbon nanotube-supported Pt and Pt-Ru nanoparticles. J Solid State Electrochem 17, 2783–2788 (2013). https://doi.org/10.1007/s10008-013-2177-1

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  • DOI: https://doi.org/10.1007/s10008-013-2177-1

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