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Highly Conductive and Robustly Stable Anion Exchange Membranes with a Star-branched Crosslinking Structure by Xin Su; Songbo Nan; Wei Wei; Shicheng Xu; Ronghuan He is a Engineering article available to read on EtoBox.

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In order to improve the ionic conductivity and durability of anion exchange membranes (AEMs), novel ether free AEMs are prepared based on 6-bromo-1-hexanol quaternized poly(terphenyl piperidine)s by construction of a star-branched crosslinking structure via a crosslinker of 1,3,5-tris(bromomethyl)benzene. The star-branched crosslinking network enhances the dimensional stability and mechanical property without occupying the active sites for cation production. Suitable microphase separations with ionic cluster spacing within 19.68-20.72 nm are formed according to the SAXS results. The proposed AEMs exhibit hydroxide ion (OH ̅ ) conductivity ranging from 118 to 136 mS cm -1 at 80 • C. The dense crosslinking structure and flexible side chains endow the AEMs with excellent resistance against the attack of OH ̅ ions. About 80% of the conductivity retention rate is achieved after immersing the AEMs in 1 mol L -1 KOH aqueous solutions at 80 • C for 1600 h. A single H 2 /O 2 fuel cell employing the prepared membrane as the electrolyte exhibits a peak power density of 639 mW cm -2 at 60 • C without back pressure.

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Author

Xin Su; Songbo Nan; Wei Wei; Shicheng Xu; Ronghuan He

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)