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<p>Under the backdrop of global energy structure transition, improving the efficiency of alkaline water electrolysis (AWE) urgently requires breakthroughs in membrane material performance. To address the high area resistance and low ionic conductivity of polyphenylene sulfide (PPS) membranes, this study developed a paper-based composite membrane. It consists of a wet-laid nonwoven PPS substrate coated with a blended functional layer of polyvinyl alcohol (PVA)-quaternized chitosan (QCS), further cross-linked by glutaraldehyde to form a PVA-QCS dual-network structure. Results show that the PPS substrate achieves a maximum porosity of 80% and tensile strength of 5.69&#xa0;MPa. The optimized PPS50@QCS80 exhibits an area resistance as low as 68&#xa0;mΩ&#xa0;cm<sup>2</sup> and ionic conductivity of 515&#xa0;mS&#xa0;cm<sup>−1</sup> in 30&#xa0;wt % KOH electrolyte, significantly surpassing commercial benchmarks such as the K350 + membrane (125&#xa0;mS&#xa0;cm<sup>−1</sup>) and ZIRFON membrane (150&#xa0;mS&#xa0;cm<sup>−1</sup>). After 168&#xa0;h of continuous operation at 500&#xa0;mA&#xa0;cm<sup>−2</sup> current density, it showed no performance degradation, confirming exceptional stability under simulated industrial conditions. These findings highlight the composite membrane’s potential to overcome critical bottlenecks in AWE systems, aligning with high energy efficiency objectives.</p>

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Fabrication and characterization of polyphenylene sulfide paper-based composite membrane for alkaline water electrolysis

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Hudeng Li,
  • Lei Dai,
  • Xuefeng Lu,
  • Zhu Long

摘要

Under the backdrop of global energy structure transition, improving the efficiency of alkaline water electrolysis (AWE) urgently requires breakthroughs in membrane material performance. To address the high area resistance and low ionic conductivity of polyphenylene sulfide (PPS) membranes, this study developed a paper-based composite membrane. It consists of a wet-laid nonwoven PPS substrate coated with a blended functional layer of polyvinyl alcohol (PVA)-quaternized chitosan (QCS), further cross-linked by glutaraldehyde to form a PVA-QCS dual-network structure. Results show that the PPS substrate achieves a maximum porosity of 80% and tensile strength of 5.69 MPa. The optimized PPS50@QCS80 exhibits an area resistance as low as 68 mΩ cm2 and ionic conductivity of 515 mS cm−1 in 30 wt % KOH electrolyte, significantly surpassing commercial benchmarks such as the K350 + membrane (125 mS cm−1) and ZIRFON membrane (150 mS cm−1). After 168 h of continuous operation at 500 mA cm−2 current density, it showed no performance degradation, confirming exceptional stability under simulated industrial conditions. These findings highlight the composite membrane’s potential to overcome critical bottlenecks in AWE systems, aligning with high energy efficiency objectives.