Membrane Engineering Reveals Descriptors of CO2 Electroreduction in an Electrolyzer

Seok Hwan Yang, Wonsang Jung, Hyeonggeon Lee, Sang Hun Shin, Seung Jae Lee, Min Suc Cha, Woong Choi, Seong Geun Oh, Ki Bong Lee, Ung Lee, Da Hye Won, Jang Yong Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Anion exchange membranes (AEMs) and ionomers are keys for electrochemical CO2 reduction (eCO2R), but their development and multiple roles have not been intensively investigated. This study demonstrates HQPC-tmIM, a polycarbazole-based anion-conducting material, as a commercially viable AEM and reveals through multiphysics model simulation key descriptors governing eCO2R by exploiting the extraordinary membrane properties of HQPC-tmIM. The mechanical/chemical stability of HQPC-tmIM showed superior eCO2R performance in a membrane electrode assembly electrolyzer (MEA) in comparison to a commercial AEM (Sustainion). The CO partial current density (jCO) of −603 mA cm-2 on HQPC-tmIM MEA is more than twice that of Sustainion MEA and is achieved by only introducing HQPC-tmIM AEM and binder. The mutiphysics model revealed that the well-constructed membrane morphology of HQPC-tmIM leads to the outstanding membrane conductivity, and it enables high jCO through the facilitated charge transfer in overall reactions. This research suggests guidelines for developing a commercially viable AEM and ionomer for eCO2R.

Original languageEnglish
Pages (from-to)1976-1984
Number of pages9
JournalACS Energy Letters
Issue number4
Publication statusPublished - 2023 Apr 14

Bibliographical note

Funding Information:
This work was supported by “Carbon to X Project” (Project No. 2020M3H7A1098227, Project No. 2020M3H7A1098229, and Project No. 2020M3H7A1098271) through the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea, a KIST and a KRICT institutional programs.

Publisher Copyright:
© 2023 American Chemical Society.

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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