Directly fluorinated polyaromatic composite membranes for vanadium redox flow batteries

Dongyang Chen, Michael A. Hickner, Shuanjin Wang, Jingjing Pan, Min Xiao, Yuezhong Meng

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Fluorinated sulfonated poly(fluorenyl ether ketone) (F-SPFEK) membranes and composites with 3-aminopropyltriethoxylsilane (F-SPFEK-APTES) were prepared for evaluation in vanadium redox flow battery (VRB) devices. Improved oxidative stability as well as increased water uptake and proton conductivity were found after direct fluorination of a sulfonated poly(fluorenyl ether ketone) (SPFEK) sample with fluorine gas. The incorporation of a polysilsesquioxane network within the fluorinated membrane effectively suppressed vanadium permeation without a large decrease in proton conductivity, leading to a membrane with a more optimized balance of proton conductivity and VO 2+ permeability for good VRB performance. Both F-SPFEK and F-SPFEK-APTES membranes showed promising characteristics for VRB application, but the coulombic efficiency of the VRB with the F-SPFEK-APTES composite membrane was 21.5% higher than the VRB with a SPFEK membrane.

Original languageEnglish (US)
Pages (from-to)139-144
Number of pages6
JournalJournal of Membrane Science
StatePublished - Oct 1 2012

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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