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Membranes 2014, 4(1), 1-19; doi:10.3390/membranes4010001
Article

Friedel–Crafts Crosslinked Highly Sulfonated Polyether Ether Ketone (SPEEK) Membranes for a Vanadium/Air Redox Flow Battery

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Received: 25 September 2013; in revised form: 4 November 2013 / Accepted: 9 December 2013 / Published: 30 December 2013
(This article belongs to the Special Issue Advancements in Membranes for Electrochemical Energy Applications)
Abstract: Highly conductive and low vanadium permeable crosslinked sulfonated poly(ether ether ketone) (cSPEEK) membranes were prepared by electrophilic aromatic substitution for a Vanadium/Air Redox Flow Battery (Vanadium/Air-RFB) application. Membranes were synthesized from ethanol solution and crosslinked under different temperatures with 1,4-benzenedimethanol and ZnCl2 via the Friedel–Crafts crosslinking route. The crosslinking mechanism under different temperatures indicated two crosslinking pathways: (a) crosslinking on the sulfonic acid groups; and (b) crosslinking on the backbone. It was observed that membranes crosslinked at a temperature of 150 °C lead to low proton conductive membranes, whereas an increase in crosslinking temperature and time would lead to high proton conductive membranes. High temperature crosslinking also resulted in an increase in anisotropy and water diffusion. Furthermore, the membranes were investigated for a Vanadium/Air Redox Flow Battery application. Membranes crosslinked at 200 °C for 30 min with a molar ratio between 2:1 (mol repeat unit:mol benzenedimethanol) showed a proton conductivity of 27.9 mS/cm and a 100 times lower VO2+ crossover compared to Nafion.
Keywords: cation exchange membrane; redox flow battery; membrane technology cation exchange membrane; redox flow battery; membrane technology
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Merle, G.; Ioana, F.C.; Demco, D.E.; Saakes, M.; Hosseiny, S.S. Friedel–Crafts Crosslinked Highly Sulfonated Polyether Ether Ketone (SPEEK) Membranes for a Vanadium/Air Redox Flow Battery. Membranes 2014, 4, 1-19.

AMA Style

Merle G, Ioana FC, Demco DE, Saakes M, Hosseiny SS. Friedel–Crafts Crosslinked Highly Sulfonated Polyether Ether Ketone (SPEEK) Membranes for a Vanadium/Air Redox Flow Battery. Membranes. 2014; 4(1):1-19.

Chicago/Turabian Style

Merle, Géraldine; Ioana, Filipoi C.; Demco, Dan E.; Saakes, Michel; Hosseiny, Seyed S. 2014. "Friedel–Crafts Crosslinked Highly Sulfonated Polyether Ether Ketone (SPEEK) Membranes for a Vanadium/Air Redox Flow Battery." Membranes 4, no. 1: 1-19.


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