Origin of Hydrogen Incorporated into Ethylene during Electrochemical CO2 Reduction in Membrane Electrode Assembly

Woong Choi, Seongho Park, Wonsang Jung, Da Hye Won, Jonggeol Na, Yun Jeong Hwang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A catholyte-free membrane electrode assembly (MEA) has been proposed for practical application in the electrochemical CO2 reduction reaction (eCO2RR), and water management becomes critical in its catalyst-membrane interface. We investigate roles of the water supply within the MEA for ethylene production by utilizing deuterium-labeled water. The protons of ethylene originated mainly from the anolyte not the humidified water through the cathode, indicating that dominant water flux from the anolyte acts as a major proton supplier for the eCO2RR. Meanwhile, humidification of CO2 is still important in the Faradaic efficiency and current density because it affects the water activity at the catalyst junction, supported by multiphysics simulations. At low cell potentials, the eCO2RR dominates and is kinetically controlled, and the mass transport of CO2 and water limits its performance as the potential increases. This understanding of the water kinetics and transportation provides valuable insights into the design of active MEAs.

Original languageEnglish
Pages (from-to)939-945
Number of pages7
JournalACS Energy Letters
Volume7
Issue number3
DOIs
StatePublished - 11 Mar 2022

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