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Electrochemical Dissolution of Platinum Electrode in Perfluoroalkylsulfonic Acid

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Abstract

The electrochemical dissolution of Pt in perfluoroalkylsulfonic acid was investigated to understand the degradation of polymer electrolyte fuel cells. Trifluoromethanesulfonic acid (TFMSA) was used as the electrolyte solution. The results showed that a Pt electrode significantly dissolves by successive potential cycling between −0.26 and 2.0 V vs. Ag/Ag2SO4 in concentrated TFMSA solutions such as 10 mol dm−3. The anodic Pt dissolution is induced during the potential step conducted in the 10 mol dm−3 TFMSA. Chronopotentiometry revealed that the Pt anodically dissolved at 2.0 V vs. Ag/Ag2SO4 is Pt4+. From the double potential chronocoulometry, it was considered that the anodic Pt dissolution in the concentrated TFMSA involves the direct dissolution of the metallic Pt and the Pt dissolution due to the place exchange of the oxygen atoms in PtO and PtO2. Also, the local low pH caused by the H+ ions generated during the O2 evolution might accelerate the significant anodic Pt dissolution in the 10 mol dm−3 TFMSA.

Significant anodic Pt dissolution in concentrated trifluoromethanesulfonic acid (TFMSA) contains the direct dissolution of the metallic Pt and the Pt dissolution due to the place exchange of the oxygen atoms in the Pt oxides.

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Authors and Affiliations

  1. Department of Materials Science and Technology, Graduate School of Engineering, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka, Niigata, 940-2188, Japan

    Minoru Umeda, Yuuki Okuda, So Takizawa, Mitsuhiro Inoue & Akira Nakazawa

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  1. Minoru Umeda
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  2. Yuuki Okuda
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  3. So Takizawa
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  4. Mitsuhiro Inoue
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  5. Akira Nakazawa
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Correspondence to Minoru Umeda.

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Umeda, M., Okuda, Y., Takizawa, S. et al. Electrochemical Dissolution of Platinum Electrode in Perfluoroalkylsulfonic Acid. Electrocatalysis 9, 243–251 (2018). https://doi.org/10.1007/s12678-017-0400-z

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