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<p>Protic ionic liquids (PILs) immobilised in an ionogene host polymer represent an intriguing alternative to the state-of-the-art commercial fluoropolymer-based membranes as proton conducting electrolytes for future intermediate-temperature fuel cells (T &gt; 100&#xa0;°C, IT-PEMFCs). In this study, two PILs, <i>N</i>, <i>N</i>-diethyl-3-sulfopropane-1-ammonium trifluoromethanesulfonate [DESPA][TfO] and diethyl-methylammonium trifluoromethanesulfonate [DEMA][TfO], were investigated for their suitability as proton conducting species in a sulfonated poly(ether-ether-ketone) membrane (sPEEK). Both PIL membrane casts exhibit good thermal stability until 200&#xa0;°C and a high ionic conductivity of up to 5.28 mS.cm<sup>−1</sup>(120&#xa0;°C, 40%RH). The polarisation curves showed a maximum power density of 3.5 mW.cm<sup>−2</sup> for [DESPA][TfO] membrane cast and 6.5 mW.cm<sup>−2</sup> for [DEMA][TfO] membrane cast, proving the suitability of the PIL membrane cast as a polymer electrolyte membrane (PEM) for the IT-PEMFCs.</p>

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Proton-conducting polymer electrolyte membranes based on sulfonated PEEK and blends of protic ionic liquids with different acidities

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月9日

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  • V. Theußl,
  • X. Cui,
  • H. Hou,
  • A. Gueguen,
  • C. Rodenbücher,
  • C. Korte

摘要

Protic ionic liquids (PILs) immobilised in an ionogene host polymer represent an intriguing alternative to the state-of-the-art commercial fluoropolymer-based membranes as proton conducting electrolytes for future intermediate-temperature fuel cells (T > 100 °C, IT-PEMFCs). In this study, two PILs, N, N-diethyl-3-sulfopropane-1-ammonium trifluoromethanesulfonate [DESPA][TfO] and diethyl-methylammonium trifluoromethanesulfonate [DEMA][TfO], were investigated for their suitability as proton conducting species in a sulfonated poly(ether-ether-ketone) membrane (sPEEK). Both PIL membrane casts exhibit good thermal stability until 200 °C and a high ionic conductivity of up to 5.28 mS.cm−1(120 °C, 40%RH). The polarisation curves showed a maximum power density of 3.5 mW.cm−2 for [DESPA][TfO] membrane cast and 6.5 mW.cm−2 for [DEMA][TfO] membrane cast, proving the suitability of the PIL membrane cast as a polymer electrolyte membrane (PEM) for the IT-PEMFCs.