Proton Exchange Membrane with Dual‐Active‐Center Surpasses the Conventional Temperature Limitations of Fuel Cells

• DOI: 10.1002/advs.202417259
• Publication Date: 2025-01-21T17:24:56Z
• Authors: Yucong Liao; Shengqiu Zhao; Rui wang; Junjie Zhang; Hao Li; Bingxuan Liu; Yao Li; Aojie Zhang; Tian Tian; Haolin Tang
• Keywords: Ionomer; Side chain; Atmospheric temperature range

Abstract High temperature‐proton exchange membrane fuel cells (HT‐PEMFC) call for ionomers with low humidity dependence and elevated‐temperature resistance. Traditional perfluorosulfonic acid (PFSA) encounter challenges in meeting these stringent requirements. Herein, this study reports a perfluoroimide multi‐acid (PFMA) ionomer dual active centers achieved through the incorporation of sulfonimide phosphonic groups into side chain. The fluorocarbon skeleton chain structure facilitate segregation hydrophilic hydrophobic microphases, augmenting short‐range ordering nanodomains. Furthermore, introduction rigid segment‐benzene ring is employed to decrease flexibility raise glass transition temperature. Notably, prepared exhibits conductivity 41 mS cm −1 at 40% relative humidity, showcasing 1.8 times improvement over that PFSA. Additionally, power output H 2 ‐air cell based on reaches 1.5 W −2 105 °C, marking substantial 2.3 enhancement compared This work demonstrates unique advantages perfluorinated multiple protogenic development high‐performance high‐temperature electrolyte materials.