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Effect of water vapor on proton conduction of cesium dihydrogen phosphateand application to intermediate temperature fuel cells

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Abstract

The proton conduction and superionic phase transition of cesium dihydrogen phosphate, CsH2PO4 (CDP), were investigated under various humid conditions to evaluate the applicability of a CsH2PO4 solid electrolyte to an intermediate temperature fuel cell operating between 230 °C and 300 °C. The phase stability, superionic phase transition, and reversibility of dehydration of CsH2PO4 were evaluated under different ambient water vapor concentrations, from 0 to 90 mol%, through the measurements of conductivity. The dependence of conductivity on the water vapor concentration and the demonstrated reversibility of dehydration clearly showed the range in which CsH2PO4 is applicable to the intermediate temperature fuel cell. Additionally, we evaluated the protonic transport number of CsH2PO4, which was almost unity, and demonstrated fuel cell operation at 250 °C using a single cell fabricated with the CsH2PO4 electrolyte.

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Authors and Affiliations

  1. Department of Environmental Chemical Engineering, Faculty of Engineering, Kogakuin University, 2665-1 Nakanomachi, Hachioji-city, Tokyo, 192-0015, Japan

    Junichiro Otomo, Satoru Nishida, Shuqiang Wang, Hidetoshi Nagamoto & Hiroshi Takahashi

  2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyoku, Tokyo, 113-8656, Japan

    Takanori Tamaki, Masaru Ogura & Takeshi Kobayashi

  3. Department of Energy Sciences, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan

    Ching-ju Wen

Authors
  1. Junichiro Otomo
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  2. Takanori Tamaki
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  3. Satoru Nishida
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  4. Shuqiang Wang
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  5. Masaru Ogura
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  6. Takeshi Kobayashi
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  7. Ching-ju Wen
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  8. Hidetoshi Nagamoto
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  9. Hiroshi Takahashi
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Correspondence to Junichiro Otomo.

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Otomo, J., Tamaki, T., Nishida, S. et al. Effect of water vapor on proton conduction of cesium dihydrogen phosphateand application to intermediate temperature fuel cells. J Appl Electrochem 35, 865–870 (2005). https://doi.org/10.1007/s10800-005-4727-4

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  • DOI: https://doi.org/10.1007/s10800-005-4727-4

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