The development of high-performance high temperature proton exchange membranes (HT-PEMs) is a huge challenge that impedes the application of HT-PEM fuel cell (HT-PEMFC). Herein, novel bulky basic group grafted ether-free poly(terphenyl piperidinium) membranes are proposed for HT-PEMFC. Through a simple one-step polymerization, the poly(terphenyl piperidine) (PTP) polymer is synthesized. In order to improve the phosphoric acid (PA) uptake and solubility of PTP in organic solvents, both benzimidazole and pyridine side chains are functionalized into the PTP backbone. Comparing with methyl and methylene pyridine grafted PTP membranes (PTP-Me and PTP-Py), the methylene benzimidazole side chain grafted membrane (PTP-BeIm) exhibits an excellent PA doping content of 215 wt% and a high conductivity of 0.088 S cm⁻¹ at 180 °C under anhydrous condition. The H₂–O₂ fuel cell based on PTP-41%BeIm/215%PA displays a high peak power density of around 1 W cm⁻² at 180 °C without any backpressure, which is about 1.5 times higher than that of PBI/342 wt%PA based cell. Thus, this work develops a facile and low-cost approach on the preparation of high-performance HT-PEMs.

高性能高温质子交换膜（HT-PEMs）的发展是阻碍HT-PEM燃料电池（HT-PEMFC）应用的巨大挑战。在此，提出了用于 HT-PEMFC 的新型大体积碱性基团接枝无醚聚（三联苯哌啶鎓）膜。通过简单的一步聚合，合成了聚（三联苯哌啶）（PTP）聚合物。为了提高磷酸 (PA) 的吸收和 PTP 在有机溶剂中的溶解度，苯并咪唑和吡啶侧链都被功能化到 PTP 主链中。与甲基和亚甲基吡啶接枝 PTP 膜（PTP-Me 和 PTP-Py）相比，亚甲基苯并咪唑侧链接枝膜（PTP-BeIm）表现出 215 wt% 的优异 PA 掺杂含量和 0.088 S cm ^-的高电导率^{- 1}在 180 °C 无水条件下。基于 PTP-41%BeIm/215%PA的 H ₂ –O ₂燃料电池在 180 °C 下显示出约 1 W cm ^{-2 的}高峰值功率密度，且没有任何背压，是 PBI 的约 1.5 倍/342 wt% PA 基电池。因此，这项工作开发了一种简便且低成本的制备高性能 HT-PEM 的方法。