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Journal of Electrochemistry ›› 2020, Vol. 26 ›› Issue (6): 797-807.  doi: 10.13208/j.electrochem.191228

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Effect of Reaction Conditions on Cu⁃Catalyzed CO2 Electroreduction

ZHU Chang1,2, CHEN Wei1,*(), SONG Yan-fang1, DONG Xiao1, LI Gui-hua1, WEI Wei1,3,*(), SUN Yu-han1,3,*()   

  1. 1. CAS Key Laboratory of Low-carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China
    2. University of Chinese Academy of Sciences, Beijing, 100049, China
    3. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
  • Received:2019-12-30 Revised:2020-02-25 Online:2020-12-28 Published:2020-04-15
  • Contact: CHEN Wei,WEI Wei,SUN Yu-han E-mail:chenw@sari.ac.cn;weiwei@sari.ac.cn;sunyh@sari.ac.cn

Abstract:

Electrochemical conversion of carbon dioxide (CO2) driven by renewable electricity that can meet both carbon emission reduction and renewable energy utilization has been rapidly developed in recent years. Copper (Cu) catalyst has long been a promising candidate for CO2 electroreduction applications because of its natural abundance and specific capability of producing a substantial amount of C2 products. However, various metallic Cu electrodes reported have been significantly influenced by the adsorption of certain cation/anion ions, resulting in wide-span catalytic activities and selectivity for various products. In addition, a recent report demonstrated that by virtue of gas-diffusion flow cell with Cu cathode, remarkable ethylene production was achieved in CO2 electroreduction. It is, therefore, desirable to systematically investigate the effect of reaction conditions on the performances of Cu-catalyzed CO2 electroreduction. Here we chose the commercial Cu particles with an average size of 600 nm as the catalyst for CO2 electroreduction and investigated the electrocatalytic performances under various reaction conditions, including the commonly used electrolyte solutions, the different potassium hydrogen carbonate (KHCO3) concentrations, as well as H-type and gas-diffusion flow cells. The results of linear sweep voltammetry and potentiostatic CO2 electrolysis showed that KHCO3 as an electrolyte solution with a concentration of 0.5 mol?L-1 offered good catalytic activities and high current densities, and the gas-diffusion flow cell could further improve the Faradaic efficiencies and partial current densities of the main products formate and CO. This work provides a fundamental insight to the electrocatalytic conversion of CO2 reduction from the view of reaction conditions.

Key words: CO2 electroreduction, copper catalyst, reaction conditions, gas-diffusion electrode

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