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 h

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
2024-02
Publisher
Wiley-VCH Verlag
Citation
Advanced Science, v.11, no.5
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-degrees), 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-degrees 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 mu V 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-degrees under fully humidified conditions, and 1.65 W cm(-2) at 100 C-degrees, 30% relative humidity. This study provides insights into the design of high-performance AEPs for energy conversion devices.
Keywords
PIPERIDINIUM) MEMBRANES; HIGH-PERFORMANCE; FORCE-FIELD; FUEL-CELLS; ION; IONOMERS; POLYMER; COMPASS; TRANSPORT; DESIGN; anion exchange polyelectrolyte; durability; high free volume; rigid backbone; water electrolysis
ISSN
2198-3844
URI
https://pubs.kist.re.kr/handle/201004/113031
DOI
10.1002/advs.202306988
Appears in Collections:
KIST Article > 2023
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