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Synthesis and characteristics of hyperbranched polymer with phosphonic acid groups for high-temperature fuel cells

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Abstract

Two different molecular weight hyperbranched polymers (HBP(L)-(PA)2 and HBP(H)-(PA)2) with two phosphonic acid groups as a functional group at the periphery and a low molecular weight hyperbranched polymer (HBP(L)-(PA)2-Ac) with both two phosphonic acid groups and an acryloyl group as a cross-linker at the periphery were successfully synthesized as thermally stable proton-conducting electrolytes. A cross-linked electrolyte membrane (CL-HBP(L)-(PA)2) was prepared by thermal polymerization of the HBP(L)-(PA)2-Ac using benzoyl peroxide. Ionic conductivities of the HBP(L)-(PA)2, the HBP(H)-(PA)2, and the CL-HBP(L)-(PA)2 under dry condition and their thermal properties were investigated, and also, the effect of the phosphonic acid group number on them was discussed. Ionic conductivities of the HBP(L)-(PA)2 and the HBP(H)-(PA)2 were found to be 1.5 × 10−5 S cm−1 at 150 °C and 3.6 × 10−6 S cm−1 at 143 °C, respectively, under dry condition, and showed the Vogel–Tamman–Fulcher type temperature dependence. The hyperbranched polymers and the cross-linked electrolyte membrane were thermally stable up to 300 °C, and the cross-linked electrolyte membrane (CL-HBP-(PA)2) had suitable thermal stability as an electrolyte membrane for the high-temperature fuel cells under dry condition. Fuel cell measurement using a single membrane electrode assembly cell with the cross-linked membrane was performed.

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Authors and Affiliations

  1. Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurima Machiya-cho, Tsu, Mie, 514-8507, Japan

    Takahito Itoh, Keita Hirai, Masashi Tamura, Takahiro Uno & Masataka Kubo

  2. Samsung Yokohama Research Institute, 2-7 Sugasawa-cho, Tsurumi-ku, Yokohama, 230-0027, Japan

    Yuichi Aihara

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  1. Takahito Itoh
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  2. Keita Hirai
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  3. Masashi Tamura
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  4. Takahiro Uno
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  5. Masataka Kubo
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  6. Yuichi Aihara
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Correspondence to Takahito Itoh.

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Itoh, T., Hirai, K., Tamura, M. et al. Synthesis and characteristics of hyperbranched polymer with phosphonic acid groups for high-temperature fuel cells. J Solid State Electrochem 14, 2179–2189 (2010). https://doi.org/10.1007/s10008-009-0947-6

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  • DOI: https://doi.org/10.1007/s10008-009-0947-6

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