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Electrochemical Conversion of CO2 to CO into a Microchannel Reactor System in the Case of Aqueous Electrolyte

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    Electrochemical Conversion of CO2 to CO into a Microchannel Reactor System in the Case of Aqueous Electrolyte
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    • Fanghua Zhang
      Fanghua Zhang
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      More by Fanghua Zhang
      Orcidhttp://orcid.org/0000-0002-9586-5837
    • Zhichao Jin
      Zhichao Jin
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      More by Zhichao Jin
    • Chengzhen Chen
      Chengzhen Chen
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      More by Chengzhen Chen
    • Yanling Tang
      Yanling Tang
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      More by Yanling Tang
    • Samah A. Mahyoub
      Samah A. Mahyoub
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      More by Samah A. Mahyoub
    • Shenglin Yan
      Shenglin Yan
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      More by Shenglin Yan
    • Zhenmin Cheng*
      Zhenmin Cheng
      State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
      *Email: [email protected]
      More by Zhenmin Cheng
      Orcidhttp://orcid.org/0000-0001-7467-7135
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    Industrial & Engineering Chemistry Research

    Cite this: Ind. Eng. Chem. Res. 2020, 59, 13, 5664–5674
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    https://doi.org/10.1021/acs.iecr.9b07014
    Published March 6, 2020
    Copyright © 2020 American Chemical Society
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    Abstract

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    A microchannel electrochemical reactor system was designed to facilitate the reduction of CO2 to CO, which is composed of a premixing section in the upstream consisting of a circular microchannel for the presaturation of CO2 in the electrolyte and a reacting section in the downstream consisting of an annular microchannel containing a Ag rod as the catalyst. Such a combined structure exhibited an ultrahigh CO faradaic efficiency of 95.3% due to the efficient mass transfer under Taylor flow. It is interesting to find that CO2 conversion was increased from 0.94 to 3.66% when the length of the microchannel was increased by connection in series due to the prolonged contacting time between CO2 and the electrocatalyst. Furthermore, “scale-up” experiments demonstrated that the faradaic efficiency for CO could keep all above 95.0% at a current density of 7.5 mA cm2 when the microchannel number was increased in parallel, revealing that the microchannel electrochemical reactor is efficient to conduct the electroreduction of CO2.

    Copyright © 2020 American Chemical Society

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    Industrial & Engineering Chemistry Research

    Cite this: Ind. Eng. Chem. Res. 2020, 59, 13, 5664–5674
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.iecr.9b07014
    Published March 6, 2020
    Copyright © 2020 American Chemical Society
    Request reuse permissions

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