Intermolecular Acid‐base‐pairs Containing Poly (p‐terphenyl‐co‐isatin piperidinium) for High Temperature Proton Exchange Membrane Fuel Cells

How to optimize and regulate the distribution of phosphoric acid in matrix, pursuing improved electrochemical performance service lifetime high temperature proton exchange membrane (HT-PEMs) fuel cell are significant challenges. Herein, bifunctional poly (p-terphenyl-co-isatin piperidinium) copolymer with tethered phosphonic (t-PA) intrinsic tertiary amine base groups firstly prepared investigated as HT-PEMs. The distinctive architecture provides a well-designed platform for rapid transport. Protons not only transports through hydrogen bond network formed by adsorbed free (f-PA) anchored groups, but also rely upon channel constructed ionic cluster t-PA aggregation. Thorough design structure, copolymers lower PA uptake level (< 100%) display prominent conductivities peak power densities (99 mS cm-1, 812 mW cm-2 at 160 °C), along leaching higher voltage stability, which is top leading result disclosed literature. results demonstrate that intermolecular acid-base-pairs can improve conductivity without sacrificing chemical stability or mechanical property thin membrane, realizing win-win demands between robustness properties