“Fishbone” Design of Amino/N-Spirocyclic Cations toward High-Performance Poly(triphenylene piperidine) Anion-Exchange Membranes for Fuel Cells
Yan Wang, Song Wang, Zhiyan Sui, Yiman Gu, Yanchao Zhang, Jian Gao, Yijia Lei, Jialin Zhao, Na Li, Jingyi Wu, Zhe Wang
Abstract
N -Spirocyclic cations have excellent alkali resistance stability, and precise design of the structure of N -spirocyclic anion-exchange membranes (AEMs) improves their comprehensive performance. Here, we design and synthesize high-performance poly(triphenylene piperidine) membranes based on the “fishbone” design of amino/ N -spirocyclic cations. The “fishbone” design does not disrupt the overall stabilized conformation but promotes a microphase separation structure, while exerting the synergistic effect of piperidine cations and spirocyclic cations, resulting in a membrane with good conductivity and alkali resistance stability. The hydroxide conductivity of the QPTPip-ASU-X membrane reached up to 133.5 mS cm –1 at 80 °C. The QPTPip-ASU-15 membrane was immersed in a 2 M NaOH solution at 80 °C for 1200 h, and the conductivity was maintained at 91.02%. In addition, the QPTPip-ASU-5 membrane had the highest peak power density of 255 mW cm –2 .