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<p>This work presents a study on pyrrole-doped ethylene glycol diglycidyl ether cross-linked chitosan (Ch) membranes for use as proton exchange membranes in fuel cells. The membranes were synthesized via evaporation and subsequently treated with glow discharge plasma (GDP) for doping times of 20, 40, and 60&#xa0;min. Results revealed that GDP doping altered the morphology of the pristine (undoped) chitosan membranes. FTIR spectra confirmed the presence of functional groups from chitosan- and polypyrrole-sulfonated chitosan, which facilitate interactions between amine (NH₂) and hydroxyl (-OH) groups within the spectral region of 3180–3500&#xa0;cm⁻<sup>1</sup>. The − SO₃H functional group exhibited characteristic bands in the 1030–1200&#xa0;cm⁻<sup>1</sup> region, associated with S = O bond stretching vibrations and potential S–O–C bond vibrations. Proton conductivity increased significantly with doping time, ranging from 6.36 × 10⁻<sup>4</sup> S cm⁻<sup>1</sup> to 2.54 × 10⁻<sup>3</sup> S cm⁻<sup>1</sup><b>.</b></p> Graphical Abstract <p></p>

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Synthesis of a chitosan/polypyrrole membrane for PEM fuel cells

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Celso Hernández-Tenorio,
  • Alejandra Díaz-Rivera,
  • Claudia A. Cortés-Escobedo,
  • Hilda Moreno-Saavedra

摘要

This work presents a study on pyrrole-doped ethylene glycol diglycidyl ether cross-linked chitosan (Ch) membranes for use as proton exchange membranes in fuel cells. The membranes were synthesized via evaporation and subsequently treated with glow discharge plasma (GDP) for doping times of 20, 40, and 60 min. Results revealed that GDP doping altered the morphology of the pristine (undoped) chitosan membranes. FTIR spectra confirmed the presence of functional groups from chitosan- and polypyrrole-sulfonated chitosan, which facilitate interactions between amine (NH₂) and hydroxyl (-OH) groups within the spectral region of 3180–3500 cm⁻1. The − SO₃H functional group exhibited characteristic bands in the 1030–1200 cm⁻1 region, associated with S = O bond stretching vibrations and potential S–O–C bond vibrations. Proton conductivity increased significantly with doping time, ranging from 6.36 × 10⁻4 S cm⁻1 to 2.54 × 10⁻3 S cm⁻1.

Graphical Abstract