Journal ArticleDOI
Enhancement of hydroxide conductivity by grafting flexible pendant imidazolium groups into poly(arylene ether sulfone) as anion exchange membranes
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In this paper, a series of poly(arylene ether sulfone)s containing a flexible pendant imidazolium cation were synthesized by grafting bromine-bearing IMD-based ionic liquids into a hydroxyl-bearing poly(ether sulfone), and 1H NMR spectroscopy was used to confirm the as-synthesized copolymers.Abstract:
Anion exchange membranes (AEMs) have been recognized as one of the most prospective polyelectrolytes for fuel cells due to their faster electrode reaction kinetics and the potential of adopting cheaper metal catalysts against proton exchange membranes (PEMs). Herein, a series of poly(arylene ether sulfone)s containing a flexible pendant imidazolium cation were synthesized by grafting bromine-bearing imidazolium-based ionic liquids into a hydroxyl-bearing poly(ether sulfone) matrix. 1H NMR spectroscopy was used to confirm the as-synthesized copolymers. Atomic force microscopy (AFM) and small angle X-ray scattering (SAXS) were used to characterize the morphology of the membranes. The incorporation of the flexible side-chain imidazolium groups is beneficial to the aggregation of the ionic clusters leading to the formation of hydrophilic/hydrophobic phase-separated morphology and nano-channels. As a result, an enhancement in the ionic conductivity can be achieved. Therefore, the as-prepared AEMs possess higher ionic conductivity than traditional benzyl-type AEMs. The weight-based ion exchange capacity (IECw) of the membranes was in the range of 1.01–1.90 meq. g−1. Correspondingly, their ionic conductivity was in the range of 22.13–59.19 and 51.66–108.53 mS cm−1 at 30 and 80 °C, respectively. Moreover, the membranes also exhibit good alkaline stability and interesting single cell performance. This work presents a facile and universal route for the synthesis of AEMs with superior performance.read more
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Journal ArticleDOI
Anion exchange membrane fuel cells: Current status and remaining challenges
Shimshon Gottesfeld,Dario R. Dekel,Miles Page,Chulsung Bae,Yushan Yan,Piotr Zelenay,Yu Seung Kim +6 more
TL;DR: In this article, the authors describe the current status of AEMFCs as having reached beginning-life performance very close to that of PEMFC, when using ultra-low loadings of Pt, while advancing towards operation on nonplatinum-group metal catalysts alone.
Journal ArticleDOI
Sustainion Imidazolium-Functionalized Polymers for Carbon Dioxide Electrolysis
TL;DR: The synthesis and testing of a series of new anion-conductive membranes that incorporate the functional character of imidazolium-based ionic liquids as co-catalysts in CO2 reduction into a solid membrane with a styrene backbone are reported.
Journal ArticleDOI
Anion Exchange Membranes’ Evolution toward High Hydroxide Ion Conductivity and Alkaline Resiliency
Christopher G. Arges,Le Zhang +1 more
TL;DR: In this article, the authors highlight new material chemistries and macromolecular designs that have fueled AEMs with ionic conductivities greater than 100 mS cm-1, while demonstrating stability for extended periods in base bath solutions of 1 M potassium (or sodium) hydroxide solutions at temperature of 80 °C or greater.
Journal ArticleDOI
Anion-Exchange Membranes for Alkaline Fuel-Cell Applications: The Effects of Cations.
Zhe Sun,Bencai Lin,Feng Yan +2 more
TL;DR: An overview of some key factors for the future design of novel cations and their analogous AEMs with high alkaline stability are provided.
Guanidinium-FunctionalizedAnionExchangePolymerElectrolytesvia Activated Fluorophenyl-Amine Reaction
TL;DR: Guanidinium-functionalized poly(arylene ether sulfone) anion exchange polymer electrolytes were synthesized via activated fluorophnyl-amine reaction, followed by the methylation with dimethyl sulfate.
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Anion exchange membranes for alkaline fuel cells: A review
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