TY - JOUR
T1 - Polybenzimidazole membranes functionalised with 1-methyl-2-mesitylbenzimidazolium ions via a hexyl linker for use in vanadium flow batteries
AU - Lee, Yona
AU - Kim, Sangwon
AU - Maljusch, Artjom
AU - Conradi, Oliver
AU - Kim, Hyoung Juhn
AU - Jang, Jong Hyun
AU - Han, Jonghee
AU - Kim, Jihyun
AU - Henkensmeier, Dirk
N1 - Funding Information:
This work was funded by Evonik Creavis, KIST institutional funding and the German-Korean joint SME R&D projects program of MOTIE/KIAT (No. 20151732 ).
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/6/12
Y1 - 2019/6/12
N2 - 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 × 10−12 m2 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.
AB - 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 × 10−12 m2 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.
KW - 2-Mesityl benzimidazolium
KW - Polybenzimidazole
KW - Vanadium redox flow battery (VRFB)
UR - http://www.scopus.com/inward/record.url?scp=85065853290&partnerID=8YFLogxK
U2 - 10.1016/j.polymer.2019.04.048
DO - 10.1016/j.polymer.2019.04.048
M3 - Article
AN - SCOPUS:85065853290
SN - 0032-3861
VL - 174
SP - 210
EP - 217
JO - Polymer (United Kingdom)
JF - Polymer (United Kingdom)
ER -
