Composite membranes based on sulfonated poly(ether ether ketone) and SiO<inf>2</inf> for a vanadium redox flow battery

Dong Hun Hyeon, Jeong Hwan Chun, Chang Hun Lee, Hyun Wook Jung, Sung Hyun Kim

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Organic-inorganic composite membranes were prepared with sulfonated poly(ether ether ketone) (SPEEK) and different amounts of silica to improve chemical stability and vanadium hindrance for a vanadium redox flow battery. The durability of the prepared composite membrane was verified using a self-made dummy cell system and fully charged vanadium cathode half-cell electrolyte, which contained oxidative vanadium ions (VO<inf>2</inf> <sup>+</sup>). The prepared composite membranes, with covalent crosslinking between the organic polymer and inorganic particles, resulted in reduced vanadium permeability and enhanced chemical stability. Ion exchange capacity, water uptake, proton conductivity, and vanadium permeability decreased with increasing silica content. Selectivity was defined to consider both permeability and proton conductivity and resulted in a membrane that exhibited both high proton conductivity and low ion permeability simultaneously. The prepared 1 wt% silica composite membrane showed 133-fold higher selectivity compared with that of a Nafion112 membrane. After the stability test, the composite membrane showed little change compared to the membrane before the stability test, which confirmed the commercial prospect of SPEEK/SiO<inf>2</inf> composite membrane for a vanadium redox flow battery.

Original languageEnglish
Pages (from-to)1554-1563
Number of pages10
JournalKorean Journal of Chemical Engineering
Issue number8
Publication statusPublished - 2015 Aug 1


  • Composite Membrane
  • Ion Exchange Membrane
  • Poly(Ether Ether Ketone)
  • Vanadium Redox Flow Battery

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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