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ACS Publications. Most Trusted. Most Cited. Most Read
Electrocatalytic Reduction of Low Concentrations of CO2 Gas in a Membrane Electrode Assembly Electrolyzer

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Download Hi-Res ImageDownload to MS-PowerPointCite This:ACS Energy Lett. 2021, 6, 10, 3488-3495
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    Electrocatalytic Reduction of Low Concentrations of CO2 Gas in a Membrane Electrode Assembly Electrolyzer
    Click to copy article linkArticle link copied!

    • Dongjin Kim
      Dongjin Kim
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
      More by Dongjin Kim
    • Woong Choi
      Woong Choi
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      More by Woong Choi
    • Hee Won Lee
      Hee Won Lee
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
      More by Hee Won Lee
    • Si Young Lee
      Si Young Lee
      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
      More by Si Young Lee
    • Yongjun Choi
      Yongjun Choi
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
      More by Yongjun Choi
    • Dong Ki Lee
      Dong Ki Lee
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
      Graduate School of Energy and Environment (Green School), Korea University, Seoul 02841, Republic of Korea
      More by Dong Ki Lee
      Orcidhttps://orcid.org/0000-0002-3740-0986
    • Woong Kim
      Woong Kim
      Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
      More by Woong Kim
      Orcidhttps://orcid.org/0000-0002-2319-6945
    • Jonggeol Na
      Jonggeol Na
      Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
      More by Jonggeol Na
    • Ung Lee*
      Ung Lee
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
      Graduate School of Energy and Environment (Green School), Korea University, Seoul 02841, Republic of Korea
      *Email for U.L.: [email protected]
      More by Ung Lee
      Orcidhttps://orcid.org/0000-0001-6693-5309
    • Yun Jeong Hwang*
      Yun Jeong Hwang
      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
      *Email for Y.J.H.: [email protected]
      More by Yun Jeong Hwang
      Orcidhttps://orcid.org/0000-0002-0980-1758
    • Da Hye Won*
      Da Hye Won
      Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
      Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
      *Email for D.H.W.: [email protected]
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    Other Access OptionsSupporting Information (1)

    ACS Energy Letters

    Cite this: ACS Energy Lett. 2021, 6, 10, 3488–3495
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    https://doi.org/10.1021/acsenergylett.1c01797
    Published September 10, 2021
    Copyright © 2021 American Chemical Society
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    Abstract

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    The direct conversion of low concentrations of CO2 is an essential approach, considering the expensive gas conditioning process for pure CO2, but has not yet been intensely studied in a membrane electrode assembly (MEA) electrolyzer. Herein, we explored the CO2 reduction with various CO2 concentrations in a zero-gap MEA electrolyzer and found that suppressing the hydrogen evolution reaction (HER) became more critical at low concentrations of CO2. We demonstrate that a Ni single-atom (Ni-N/C) catalyst exhibits a high tolerance toward low CO2 partial pressure (PCO2) because of the intrinsically large activation energy of the HER. Ni-N/C outperformed the CO productivity of Ag nanoparticles, especially at low concentrations of CO2 in the zero-gap MEA. When the PCO2 was lowered from 1.0 to 0.1 atm, Ni-N/C maintained >93% of CO Faradaic efficiency (FECO), but Ag nanoparticles showed a decrease in FECO from 94% to 40%. Furthermore, on the basis of a computational fluid dynamics simulation, we developed extrinsic operating conditions controlling the water transfer from the anolyte to the catalyst layer and improved CO selectivity at low CO2 concentrations in the MEA electrolyzer.

    Copyright © 2021 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsenergylett.1c01797.

    • Experimental details, TEM, SEM, and XPS analyses of the prepared Ag and Ni-N/C electrodes, schematic illustration of the MEA electrolyzer, CO2R performance graph involving current density, Faradaic efficiency, and CO2 conversion, CFD simulation results for the MEA system, and comparison of CO2R performance in this study with literature results (PDF)

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    Cited By

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    This article is cited by 40 publications.

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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2021, 6, 10, 3488–3495
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsenergylett.1c01797
    Published September 10, 2021
    Copyright © 2021 American Chemical Society
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