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Intermolecular Acid–Base-Pairs Containing Poly (p-Terphenyl-co-Isatin Piperidinium) for High Temperature Proton Exchange Membrane Fuel Cells
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2023-04-03 , DOI: 10.1002/eem2.12621
Xiaofeng Hao 1 , Zhen Li 1 , Min Xiao 1 , Zhiheng Huang 1 , Dongmei Han 1, 2 , Sheng Huang 1 , Wei Liu 1 , Shuanjin Wang 1 , Yuezhong Meng 1, 2, 3, 4
Affiliation  

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

中文翻译:

用于高温质子交换膜燃料电池的含有聚(对三联苯-靛红哌啶)的分子间酸碱对

如何优化和调节磷酸在基质中的分布,追求提高高温质子交换膜(HT-PEM)燃料电池的电化学性能和使用寿命是重大挑战。在此,首先制备了具有束缚膦酸( t- PA)和固有叔胺碱基的双功能聚(对三联苯-靛红哌啶鎓)共聚物并作为HT-PEM进行了研究。该共聚物独特的结构为快速质子传输提供了精心设计的平台。质子不仅通过叔胺基团锚定的吸附游离磷酸(f- PA)形成的氢键网络进行传输,而且还依赖于t- PA聚集形成的离子簇构建的质子通道。通过结构设计,具有较低 PA 吸收水平 (<100%) 的双功能共聚物表现出突出的质子电导率和峰值功率密度(160 °C 时为 99 mS cm -1、 812 mW cm -2),同时具有较低的 PA浸出和更高的电压稳定性,这是公开文献中的首要结果。结果表明,分子间酸碱对的设计可以在不牺牲薄膜固有化学稳定性或机械性能的情况下提高质子电导率,实现HT-PEM的机械鲁棒性和电化学性能之间的双赢需求。
更新日期:2023-04-03
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