30 μm thin hexamethyl-p-terphenyl poly(benzimidazolium) anion exchange membrane for vanadium redox flow batteries

Shanahan B, Böhm T, Britton B, Holdcroft S, Zengerle R, Vierrath S, Thiele S, Breitwieser M (2019)


Publication Type: Journal article

Publication year: 2019

Journal

Book Volume: 102

Pages Range: 37-40

DOI: 10.1016/j.elecom.2019.03.016

Abstract

We present the first results of an anion exchange ionomer membrane, hexamethyl-p-terphenyl poly(benzimidazolium) (HMT-PMBI), in a vanadium redox flow battery. Anion exchange membranes exhibit superior vanadium crossover suppression compared to proton exchange membranes due to the Gibbs–Donnan effect. HMT-PMBI was benchmarked against a similarly thin Nafion XL membrane which allowed us to compare differences based solely on chemical properties of the ionomer materials. We report cycling data of 45 cycles at a current density of 150 mA/cm 2 with excellent coulombic efficiency of >99.4%, energy efficiency of 80.6–74.2% and a low ohmic resistance of 0.219–0.255 Ω cm 2 . In addition, a three times lower self-discharge rate is obtained for the HMT-PMBI membrane compared to Nafion XL. HMT-PMBI is therefore a potential alternative for PFSA based ionomers in VRFB applications.

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APA:

Shanahan, B., Böhm, T., Britton, B., Holdcroft, S., Zengerle, R., Vierrath, S.,... Breitwieser, M. (2019). 30 μm thin hexamethyl-p-terphenyl poly(benzimidazolium) anion exchange membrane for vanadium redox flow batteries. Electrochemistry Communications, 102, 37-40. https://dx.doi.org/10.1016/j.elecom.2019.03.016

MLA:

Shanahan, Brian, et al. "30 μm thin hexamethyl-p-terphenyl poly(benzimidazolium) anion exchange membrane for vanadium redox flow batteries." Electrochemistry Communications 102 (2019): 37-40.

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