Highly conductive and stable hybrid ionic cross-linked sulfonated PEEK for fuel cell

Juanjuan Han, Ying Wu, Jing Pan, Yanqiu Peng, Ying Wang, Chen Chen, Qiyun Pan, Bo Xie, Nian Zhao, Yu Wang, Juntao Lu, Li Xiao, Lin Zhuang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


An ideal proton exchange membrane for fuel-cell application should possess excellent dimensional stability, high ionic conductivity and inexpensiveness. Introducing cross-links into the polymer structures is a popular strategy to alleviate the tradeoff between swelling ratio and ionic conductivity of high ion exchange capacity proton exchange membranes. However, the cross-links in these membranes will block the transport of H+, resulting in unfavorable decrease of conductivity. Here we report a systematic study of acSPEEK-Sx membranes with alkyl chain attached ionic cross-links to demonstrate how the unique cross-links can improve both the conductivity and swelling behavior of the materials. Compared to the conventional SPEEK, in addition to high anti-oxidative stability, the ionic conductivity and swelling behavior of the acSPEEK-Sx samples are significantly improved. A high proton conductivity of 101.2 mS cm−1 and a low swelling degree of 15.0% are observed in the acSPEEK-S6 membrane at the temperature of 80 °C. Based on the high-performance acSPEEK-S6 sample, a peak power density of 750 mW cm−2 is achieved at 60 °C, which is similar or superior to those of Nafion 112 (710 mW cm−2) under the same measurement conditions.

Original languageEnglish (US)
Pages (from-to)353-361
Number of pages9
JournalElectrochimica Acta
StatePublished - Nov 20 2018

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Electrochemistry


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