High-performance poly(aromatic pyridine)copolymers with crown ether moieties for high temperature polymer electrolyte membrane fuel cells  

作　　者：Qian Wang Songhao Zhao Yunpeng Guo Wei Wei Lele Wang Jingshuai Yang 

机构地区：[1]Department of Chemistry,College of Sciences,Northeastern University,Shenyang 110819,China [2]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

出　　处：《Science China Chemistry》2025年第3期1078-1090,共13页中国科学(化学英文版)

基　　金：supported by the Fundamental Research Funds for the Central Universities of China (N2005026);Natural Science Foundation of Liaoning Province (2020-MS-087)。

摘　　要：This study concentrates on the development of high temperature polymer electrolyte membranes(HT-PEMs),which are essential components for HT-PEM fuel cells(HT-PEMFCs).Although the phosphoric acid(PA)-doped polybenzimidazole(PBI)has been regarded as the successful HT-PEM,this system still suffers from several challenges,including the use of carcinogenic monomers,complex synthesis procedures,and poor solubility in organic solvents.To develop more cost-effective,readily synthesized and high-performance alternatives,this study employs a simply superacid-catalyzed Friedel-Crafts reaction to synthesize a series of poly(triphenyl-co-dibenzo-18-crown-6 pyridine)copolymers,denoted as P(TP_(x%)-co-CE_(y%)),using ptriphenyl,dibenzo-18-crown-6 and 4-acetylpyridine as monomers.The copolymerized hydrophilic and bulky crown ether unites introduce large free volumes and multiple interaction sites with PA molecules,as elucidated by theoretical calculations.Meanwhile microphase separation structures are formed as confirmed by atomic force microscope(AFM),transmission electron microscopy(TEM)and small-angle X-ray scattering(SAXS).Thus P(TP_(x%)-co-CE_(y%))membranes exhibit excellent PA absorption and proton conduction abilities.For example,after immersing in 85 wt%PA at 30℃,the P(TP_(91%)-co-CE_(9%))membrane achieves a PA doping content of 205%and a high conductivity of 0.138 S cm^(-1)at 180℃,while maintaining a tensile strength of 7.5 MPa at room temperature.Without humidification and backpressure,the peak power density of an H_(2)-O_(2)cell equipped with P(TP_(91%)-co-CE_(9%))/205%PA reaches nearly 1200 mW cm^(-2),representing one of the highest performances reported for PA-doped HT-PEMs to date.This work demonstrates the enormous potential of poly(triphenyl-co-crown ether pyridine)membranes in the HT-PEMFC applications.

关 键 词：high temperature proton exchange membrane poly(arylene pyridine) crown ether COPOLYMER fuel cell 

分 类 号：TQ317[化学工程—高聚物工业] TM911.4[电气工程—电力电子与电力传动]