Poly(carbazole)-based anion-conducting materials with high performance and durability for energy conversion devices

Min Suc Cha, Ji Eun Park, Sungjun Kim, Seung Hui Han, Sang Hun Shin, Seok Hwan Yang, Tae Ho Kim, Duk Man Yu, Soonyong So, Young Taik Hong, Sang Jun Yoon, Seong Geun Oh, Sun Young Kang, Ok Hee Kim, Hyun S. Park, Byungchan Bae, Yung Eun Sung, Yong Hun Cho, Jang Yong Lee

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Anion conducting polymers (ACPs) are essential materials for alkaline electrochemical energy technology such as anion-exchange membrane fuel cells (AEMFCs) and water electrolysers (AEMWEs). The aforementioned polymers are promising alternatives for proton exchange membrane-based systems due to the possibility of using platinum group metal-free electrocatalysts. However, there are still no reliable ACPs possessing the desired performance and stability, which is a major challenge for developing alkaline energy systems. Herein, we highlight an anion-exchange membrane and ionomer based on quaternised poly-carbazole (QPC-TMA) with a rigid ether-free and curved backbone structure comprised of carbazole monomers. The developed ACP exhibits excellent ionic conductivity, as well as chemical and mechanical stability. Moreover, the AEMFC using QPC-TMA shows excellent performance (1.61 W cm-2) compared with the other best-performing AEMFCs. In addition, the AEMWE using QPC-TMA demonstrates outstanding stability and state-of-the-art performance (3.5 A cm-2 at 1.9 V), which is the first report of an AEMWE that outperforms the best-performing proton-exchange membrane water electrolysers.

Original languageEnglish
Pages (from-to)3633-3645
Number of pages13
JournalEnergy and Environmental Science
Volume13
Issue number10
DOIs
StatePublished - 2020 Oct

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