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Start Over Author "Yan, Xiaoming" Journal acs applied materials & interfaces
8 results on '"Yan, Xiaoming"'

8. Electron-Donating C-NH2Link Backbone for Highly Alkaline and Mechanical Stable Anion Exchange Membranes

Author

Zhang, Fan, Li, Tiantian, Chen, Wanting, Wu, Xuemei, Yan, Xiaoming, Xiao, Wu, Zhang, Yang, Wang, Xiaozhou, and He, Gaohong

Abstract

Aryl-ether cleavage and benzylic quaternary ammonium (QA) group degradation are promoted by C═O groups in most commercial anion exchange membrane materials. Herein, a novel strategy of converting C═O groups to the electron-donating C-NH2linkages in conventional poly(arylene ether ketone)s is proposed by reductive amination via Leuckart reaction. Density functional theory (DFT) calculations indicate that the model compound containing C-NH2linkage exhibits much higher barrier heights for aryl-ether cleavage and QA group degradation by enhancing the electronic cloud density on both the ether-connected carbon and the benzylic carbon. The C-NH2linkages also induce hydrogen bond networks in the membranes, which enhance intermolecular interaction and provide additional hydroxide transport sites. As a result, the C-NH2linkage membranes exhibit excellent hydroxide conductivity (108.2 mS cm–1at 80 °C) and tensile strength (48.4 MPa) with high elongation at break (50.8%). The C-NH2linkage membranes also show outstanding alkaline stability with no detectable backbone degradation even in 4 M KOH at 80 °C for 400 h, which is at the top-level among the state-of-the-art main chain architecture AEMs. This study proposes a new strategy for the synthesis of highly stable AEMs based on electron-donating C-NH2link backbone.

Published
2021
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