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<p>Polymer electrolyte membranes based on Aquivion<sup>®</sup> polymer dispersion (D72-25BS), produced by Syensqo, were prepared using a standardized in-house Doctor-Blade casting technique for application in H<sub>2</sub>/air PEM fuel cells (PEMFCs). The study aimed to identify the optimal preparation method for low-equivalent-weight (EW = 720&#xa0;g/eq) Aquivion<sup>®</sup>, a copolymer of TetraFluoroEthylene (TFE) and Sulfonyl Fluoride Vinyl Ether (SFVE), known as Short-Side-Chain (SSC) ionomer. SSC ionomers offer higher ion-exchange capacity (IEC) and proton conductivity compared to Long-Side-Chain (LSC) perfluorosulphonic counterparts. Comprehensive characterization was performed using in-situ X-ray Diffraction (XRD), micro-Raman spectroscopy, water retention, IEC, Dynamic-Mechanical Analysis (DMA), proton conductivity and electrochemical tests to assess the influence of casting methods and post-casting treatments. Two recast Aquivion<sup>®</sup> membranes were developed and compared to a pilot-scale e-PTFE reinforced Aquivion<sup>®</sup> membrane supplied by Syensqo. The recast Aqu10 membrane, thermally-treated at 155&#xa0;°C and subsequently acid-treated, showed an excellent proton conductivity of about 0.073 S/cm under harsh conditions (110&#xa0;°C; 50%RH) outperforming both the e-PTFE-reinforced reference membrane and the Aqu1 membrane, which was thermally treated at a higher temperature (190&#xa0;°C). Moreover, the recast Aqu10 membrane achieved a power density of 0.67 W/cm<sup>2</sup> (@0.6&#xa0;V) compared to 0.43 W/cm<sup>2</sup> (@0.6&#xa0;V) under PEMFC operating drastic conditions (95&#xa0;°C; 50%RH) confirming the effectiveness of the selected preparation method and making this membrane a promising prototype for PEMFC applications.</p>

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Electrochemical and structural characterization of recast aquivion® EW720 polymer electrolyte membranes for proton exchange membrane fuel cell (PEMFC) applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月23日

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  • A. Saccà,
  • V. Baglio,
  • B. Paci,
  • A. Generosi,
  • F. Righi Riva,
  • I. Gatto

摘要

Polymer electrolyte membranes based on Aquivion® polymer dispersion (D72-25BS), produced by Syensqo, were prepared using a standardized in-house Doctor-Blade casting technique for application in H2/air PEM fuel cells (PEMFCs). The study aimed to identify the optimal preparation method for low-equivalent-weight (EW = 720 g/eq) Aquivion®, a copolymer of TetraFluoroEthylene (TFE) and Sulfonyl Fluoride Vinyl Ether (SFVE), known as Short-Side-Chain (SSC) ionomer. SSC ionomers offer higher ion-exchange capacity (IEC) and proton conductivity compared to Long-Side-Chain (LSC) perfluorosulphonic counterparts. Comprehensive characterization was performed using in-situ X-ray Diffraction (XRD), micro-Raman spectroscopy, water retention, IEC, Dynamic-Mechanical Analysis (DMA), proton conductivity and electrochemical tests to assess the influence of casting methods and post-casting treatments. Two recast Aquivion® membranes were developed and compared to a pilot-scale e-PTFE reinforced Aquivion® membrane supplied by Syensqo. The recast Aqu10 membrane, thermally-treated at 155 °C and subsequently acid-treated, showed an excellent proton conductivity of about 0.073 S/cm under harsh conditions (110 °C; 50%RH) outperforming both the e-PTFE-reinforced reference membrane and the Aqu1 membrane, which was thermally treated at a higher temperature (190 °C). Moreover, the recast Aqu10 membrane achieved a power density of 0.67 W/cm2 (@0.6 V) compared to 0.43 W/cm2 (@0.6 V) under PEMFC operating drastic conditions (95 °C; 50%RH) confirming the effectiveness of the selected preparation method and making this membrane a promising prototype for PEMFC applications.