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In Situ Analysis of Scan Rate Effects on Pt Dissolution Under Potential Cycling Using a Channel Flow Double Electrode

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Abstract

To investigate the effect of scan rate (ν), the instantaneous dissolution of Pt under potential cycling 0.5–200 mV/s was studied using a channel flow double electrode. In an anodic scan, ν affects the initiation and inhibition of Pt dissolution during oxide formation. Slow scans induce Pt dissolution earlier, but soon suppress it. The extent of dissolution, however, did not show significant changes like the oxide development does when changing the ν. In a cathodic scan, the electrochemical dissolution of Pt2+ during oxide reduction speeds up with ν. The trivial chemical dissolution of unstable PtO2 into Pt4+ also occurs and increases with increasing ν.

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Acknowledgments

The authors acknowledge the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, for financial support.

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Authors and Affiliations

  1. Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 S8-12 O-okayama, Meguro-ku, Tokyo, 152-8550, Japan

    Zhongqi Wang, Eiji Tada & Atsushi Nishikata

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  1. Zhongqi Wang
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  2. Eiji Tada
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  3. Atsushi Nishikata
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Correspondence to Zhongqi Wang.

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Wang, Z., Tada, E. & Nishikata, A. In Situ Analysis of Scan Rate Effects on Pt Dissolution Under Potential Cycling Using a Channel Flow Double Electrode. Electrocatalysis 6, 179–184 (2015). https://doi.org/10.1007/s12678-014-0232-z

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