Novel sulfonated N-heterocyclic poly(aryl ether ketone ketone)s with pendant phenyl groups for proton exchange membrane performing enhanced oxidative stability and excellent fuel cell properties

Qian Liu, Xiaoke Li, Shouhai Zhang, Zhaoqi Wang, Yuning Chen, Shengyang Zhou, Chenghao Wang, Kaiwen Wu, Jianguo Liu, Qing Mao, Xigao Jian