Scholarlink

<p>Fluorine‑free proton exchange membranes are increasingly required to replace perfluoro sulfonic acid (PFAS) materials in hydrogen fuel cells operating at low humidity and moderate temperatures. In this work, a one‑step grafting–crosslinking strategy was used to fabricate a dual‑functionalized sulfonated poly(ether sulfone) membrane (SPESOD) incorporating hydrophobic octylamine side chains and sulfonamide crosslinks via NH₂PES. This architecture enhances nanoscale phase separation, stabilizes ionic domains, and improves mechanical integrity at high sulfonation levels. The membrane exhibits an ion‑exchange capacity of 1.1 meq/g, thermal stability above 250&#xa0;°C, and a storage modulus exceeding 200&#xa0;MPa. SPESOD achieves a proton conductivity of 0.14&#xa0;S/cm at 120&#xa0;°C and 100% RH, along with a proton transport number of t⁺ ≥ 0.99, indicating highly selective proton conduction. In single‑cell fuel‑cell testing, the membrane delivers a peak power density of 165 mW/cm<sup>2</sup> under the same conditions as Nafion<sup>®</sup> 117, demonstrating competitive performance. These results show that SPESOD provides a scalable, fluorine‑free platform with a balanced combination of conductivity, mechanical robustness, and regulatory compliance for next‑generation hydrogen fuel cells.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dual‑functionalized sulfonated poly (arylene ether sulfone) membranes with sulfonamide crosslinks and octyl grafts for intermediate‑temperature proton exchange fuel cells

  • 期刊论文

  • 发表日期：

    2026年6月15日

查看全文
  • Qana A. Alsulami,
  • Walid Mabrouk,
  • Sherif M. A. S. Keshk

摘要

Fluorine‑free proton exchange membranes are increasingly required to replace perfluoro sulfonic acid (PFAS) materials in hydrogen fuel cells operating at low humidity and moderate temperatures. In this work, a one‑step grafting–crosslinking strategy was used to fabricate a dual‑functionalized sulfonated poly(ether sulfone) membrane (SPESOD) incorporating hydrophobic octylamine side chains and sulfonamide crosslinks via NH₂PES. This architecture enhances nanoscale phase separation, stabilizes ionic domains, and improves mechanical integrity at high sulfonation levels. The membrane exhibits an ion‑exchange capacity of 1.1 meq/g, thermal stability above 250 °C, and a storage modulus exceeding 200 MPa. SPESOD achieves a proton conductivity of 0.14 S/cm at 120 °C and 100% RH, along with a proton transport number of t⁺ ≥ 0.99, indicating highly selective proton conduction. In single‑cell fuel‑cell testing, the membrane delivers a peak power density of 165 mW/cm2 under the same conditions as Nafion® 117, demonstrating competitive performance. These results show that SPESOD provides a scalable, fluorine‑free platform with a balanced combination of conductivity, mechanical robustness, and regulatory compliance for next‑generation hydrogen fuel cells.