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Evaluation of Solubility of Ru in Acidic Solution

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Abstract

The Pt–Ru alloy is used as an electrocatalyst for stationary polymer electrolyte fuel cells (PEFCs) and direct methanol fuel cells because of its anti –CO poisoning property. Degradation of the Pt–Ru anode is one of the important problems for the durability of PEFC systems. In this study, the dissolution of Ru and RuO2 has been investigated in sulfuric acid as a fundamental study of the stability of the Pt–Ru anode. The stability of Ru was very sensitive to the history of the surface treatment. The steady-state concentration of Ru ions from RuO2/Ti was less than 2 μmol dm−3 and slightly increased with potential in the range from 0.2 to 0.5 V vs. RHE. On the other hand, the concentration of Ru ions from Ru-black/Au was a several times greater than that from RuO2/Ti up to 0.3 V. vs. RHE and significantly increased above 0.5 V vs. RHE. The maximum concentration was 16 μmol dm−3 at 0.6 V vs. RHE. The surface of Ru might be irreversible with a potential change, and the steady-state concentration would be affected by the surface property.

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Acknowledgments

This study was supported by the New Energy and Industrial Technology Development Organization (NEDO). The authors thank NEDO for the financial support.

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Authors and Affiliations

  1. Chemical Energy Laboratory, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Japan

    Shigenori Mitsushima, Shunsuke Uzuka, Koichi Matsuzawa & Ken-ichiro Ota

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  1. Shigenori Mitsushima
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  2. Shunsuke Uzuka
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  3. Koichi Matsuzawa
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  4. Ken-ichiro Ota
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Correspondence to Shigenori Mitsushima.

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Mitsushima, S., Uzuka, S., Matsuzawa, K. et al. Evaluation of Solubility of Ru in Acidic Solution. Electrocatal 1, 83–86 (2010). https://doi.org/10.1007/s12678-010-0004-3

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  • DOI: https://doi.org/10.1007/s12678-010-0004-3

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