Polybenzimidazole membranes functionalised with 1-methyl-2-mesitylbenzimidazolium ions via a hexyl linker for use in vanadium flow batteries

Authors
Lee, YonaKim, SangwonMaljusch, ArtjomConradi, OliverKim, Hyoung-JuhnJang, Jong HyunHan, JongheeKim, JihyunHenkensmeier, Dirk
Issue Date
2019-06
Publisher
ELSEVIER SCI LTD
Citation
POLYMER, v.174, pp.210 - 217
Abstract
1-(6-bromohexyl)-3-methyl-2-(2,4,6-trimethylphenyl)-2H-benzimidazolium bromide was synthesised and grafted onto polybenzimidazole (PBI). The highest obtained degrees of functionalisation were 0.7 and 1.1 ionic groups per repeat unit, corresponding to ion exchange capacities of 1.25 and 1.55 mmol chloride/g. While the latter material had much reduced tensile strength and Young's modulus, the material with a lower degree of functionalisation showed properties similar to PBI and was therefore further investigated. X-ray scattering showed that the functional group reduced the crystallinity. Conductivity was in the range of 2-3 mS cm(-1,) but increased to 23 mS cm(-1) after doping in 2 M sulfuric acid, 2-4 times higher than for doped PBI. Permeability for VO2+ ions was 0.8 x 10(-12) m(2) s(-1). In the vanadium redox flow battery, the grafted PBI showed higher coulomb and voltage efficiency than PBI, and therefore also higher energy efficiency.
Keywords
ANION-EXCHANGE MEMBRANES; BLEND MEMBRANES; PBI-OO; STABILITY; EFFICIENCY; Vanadium redox flow battery (VRFB); Polybenzimidazole; 2-Mesityl benzimidazolium
ISSN
0032-3861
URI
https://pubs.kist.re.kr/handle/201004/119963
DOI
10.1016/j.polymer.2019.04.048
Appears in Collections:
KIST Article > 2019
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