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<p>A strategy to mitigate corrosion on the bipolar plates of proton exchange membrane fuel cells (PEMFC) is the use of coatings based on conducting polymeric composites. In this study, electrochemical deposition of polypyrrole (PPy), PPy/sodium dodecyl sulfate (SDS), and PPy/SDS/carbon nanotubes (CNTs) films on 304 stainless steel substrates was performed. Scanning electron microscopy results showed a cauliflower-like morphology representative of PPy and a fibrillar morphology indicative of polypyrrole growth on carbon nanotubes. Thermogravimetric analysis reveals the thermal stability of the films in three steps. Electrical conductivity determined as a function of temperature varies from 1.0<sup>3</sup> × 10<sup>–4</sup> to 1.88 S/cm. Spectra obtained by Fourier transform infrared spectroscopy show the vibrations of the N–H, C=C, C–C and C–H functional groups corresponding to the PPy ring, as well as the stretching vibration of the S=O bond of the SDS sulfonate anion. Open-circuit potential analysis showed the corrosion process behavior of PPy, PPy/SDS and PPy/SDS/CNTs coatings.</p> Graphical abstract <p></p>

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Anticorrosive coating in a proton exchange membrane fuel cell (PEMFC)

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Gustavo A. Pichardo-Albarrán,
  • Hilda Moreno-Saavedra,
  • Celso Hernández-Tenorio,
  • Claudia A. Cortes-Escobedo,
  • Arturo Tepale-Cortés

摘要

A strategy to mitigate corrosion on the bipolar plates of proton exchange membrane fuel cells (PEMFC) is the use of coatings based on conducting polymeric composites. In this study, electrochemical deposition of polypyrrole (PPy), PPy/sodium dodecyl sulfate (SDS), and PPy/SDS/carbon nanotubes (CNTs) films on 304 stainless steel substrates was performed. Scanning electron microscopy results showed a cauliflower-like morphology representative of PPy and a fibrillar morphology indicative of polypyrrole growth on carbon nanotubes. Thermogravimetric analysis reveals the thermal stability of the films in three steps. Electrical conductivity determined as a function of temperature varies from 1.03 × 10–4 to 1.88 S/cm. Spectra obtained by Fourier transform infrared spectroscopy show the vibrations of the N–H, C=C, C–C and C–H functional groups corresponding to the PPy ring, as well as the stretching vibration of the S=O bond of the SDS sulfonate anion. Open-circuit potential analysis showed the corrosion process behavior of PPy, PPy/SDS and PPy/SDS/CNTs coatings.

Graphical abstract