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Simultaneous Electrochemical Measurement of Oxygen Reduction and Pt Oxide Formation/Reduction on Pt Nanoparticle Surface

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Abstract

Using a rotating ring-disk electrode with shielding technique, oxygen reduction reaction (ORR) and surface oxide formation/reduction on Pt nanoparticles were successfully measured at the same time. The surface oxide coverage in presence of oxygen dissolved in electrolyte was found to be affected by concentration of the oxygen, indicating that the coverage measured using conventional voltammetric method under deaerated condition is not necessarily consistent with that when ORR proceeds. Analyses of relationship between the oxide coverage and the ORR kinetics revealed that the Pt oxide has little effect on the ORR kinetic on bare Pt surface. Hence, the oxide does not alter the adsorption energy of reaction intermediates very much whereas that blocks active sites for ORR.

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Acknowledgments

We acknowledge Dr. Koichi Matsuzawa, Dr. Akimitsu Ishihara, Dr. Shyam Kocha, and Mr. Yoshiki Nagahara for their helpful discussions.

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Authors and Affiliations

  1. Advanced Materials Laboratory, Nissan Research Center, Nissan Motor Co., Ltd., Yokosuka, Japan

    Seiho Sugawara & Kazuhiko Shinohara

  2. Chemical Energy Laboratory, Yokohama National University, Yokohama, Japan

    Kohei Tsujita, Shigenori Mitsushima & Ken-ichiro Ota

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  1. Seiho Sugawara
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  2. Kohei Tsujita
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  3. Shigenori Mitsushima
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  4. Kazuhiko Shinohara
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  5. Ken-ichiro Ota
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Correspondence to Seiho Sugawara.

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Sugawara, S., Tsujita, K., Mitsushima, S. et al. Simultaneous Electrochemical Measurement of Oxygen Reduction and Pt Oxide Formation/Reduction on Pt Nanoparticle Surface. Electrocatal 2, 60–68 (2011). https://doi.org/10.1007/s12678-010-0036-8

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  • DOI: https://doi.org/10.1007/s12678-010-0036-8

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