title: Phenolphthalein-based Poly(arylene ether sulfone nitrile)s Multiblock Copolymers As Anion Exchange Membranes for Alkaline Fuel Cells.
abstract: A series of phenolphthalein-based poly(arylene ether sulfone nitrile)s (PESN) multiblock copolymers containing 1-methylimidazole groups (ImPESN) were synthesized to prepare anion exchange membranes (AEMs) for alkaline fuel cells. The ion groups were introduced selectively and densely on the unit of phenolphthalein as the hydrophilic segments, allowing for the formation of ion clusters. Strong polar nitrile groups were introduced into the hydrophobic segments with the intention of improving the dimensional stability of the AEMs. A well-controlled multiblock structure was responsible for the well-defined hydrophobic/hydrophilic phase separation and interconnected ion-transport channels, as confirmed by atomic force microscopy and small angle X-ray scattering. The ImPESN membranes with low swelling showed a relatively high water uptake, high hydroxide ion conductivity together with good mechanical, thermal and alkaline stability. The ionic conductivity of the membranes was in the range of 3.85-14.67×10(-2) S·cm(-1) from 30 to 80 °C. Moreover, a single H2/O2 fuel cell with the ImPESN membrane showed an open circuit voltage of 0.92 V and a maximum power density of 66.4 mW cm(-2) at 60 °C.
authors.forename: Ao Nan
authors.initials: AN
authors.lastname: Lai
authors.forename: Li Sha
authors.initials: LS
authors.lastname: Wang
authors.forename: Chen Xiao
authors.initials: CX
authors.lastname: Lin
authors.forename: Yi Zhi
authors.initials: YZ
authors.lastname: Zhuo
authors.forename: Qiu Gen
authors.initials: QG
authors.lastname: Zhang
authors.forename: Ai Mei
authors.initials: AM
authors.lastname: Zhu
authors.forename: Qing Lin
authors.initials: QL
authors.lastname: Liu
keywords: alkaline fuel cells; anion exchange membrane; multiblock copolymer; phenolphthalein; poly(arylene ether sulfone nitrile)