DataVXACS Energy LettersPaper
journal article·2022-03-11

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

ACS Energy Letters· Volume 7· Issue 3
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Source abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storageCatalysis & surfaces

OpenAlex topics: CO2 Reduction Techniques and Catalysts · Advanced battery technologies research · Ionic liquids properties and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea

School of Chemical and Biological Engineering, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 08826, South Korea

Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea

Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea

Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea

Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea

Funding

National Research Foundation of Korea

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