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High Free Volume Polyelectrolytes for Anion Exchange Membrane Water Electrolyzers with a Current Density of 13.39 A cm−2 and a Durability of 1000 hopen access

Authors
Hu, ChuanKang, Hyun WooJung, Seung WonLiu, Mei-LingLee, Young JunPark, Jong HyeongKang, Na YoonKim, Myeong-GeunYoo, Sung JongPark, Chi HoonLee, Young Moo
Issue Date
Dec-2023
Publisher
John Wiley and Sons Inc
Keywords
anion exchange polyelectrolyte; durability; high free volume; rigid backbone; water electrolysis
Citation
Advanced Science
Indexed
SCIE
SCOPUS
Journal Title
Advanced Science
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/68831
DOI
10.1002/advs.202306988
ISSN
2198-3844
2198-3844
Abstract
The rational design of the current anion exchange polyelectrolytes (AEPs) is challenging to meet the requirements of both high performance and durability in anion exchange membrane water electrolyzers (AEMWEs). Herein, highly-rigid-twisted spirobisindane monomer is incorporated in poly(aryl-co-aryl piperidinium) backbone to construct continuous ionic channels and to maintain dimensional stability as promising materials for AEPs. The morphologies, physical, and electrochemical properties of the AEPs are investigated based on experimental data and molecular dynamics simulations. The present AEPs possess high free volumes, excellent dimensional stability, hydroxide conductivity (208.1 mS cm−1 at 80 °C), and mechanical properties. The AEMWE of the present AEPs achieves a new current density record of 13.39 and 10.7 A cm−2 at 80 °C by applying IrO2 and nonprecious anode catalyst, respectively, along with outstanding in situ durability under 1 A cm−2 for 1000 h with a low voltage decay rate of 53 µV h−1. Moreover, the AEPs can be applied in fuel cells and reach a power density of 2.02 W cm−2 at 80 °C under fully humidified conditions, and 1.65 W cm−2 at 100 °C, 30% relative humidity. This study provides insights into the design of high-performance AEPs for energy conversion devices. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.
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