Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (2): 246-252.doi: 10.1007/s40242-022-2149-z

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Carbonized Yolk-shell Metal-Organic Frameworks for Electrochemical Conversion of CO2 into Ethylene

WANG Renquan, LI Tiantian, GAO Rui, QIN Jiaqi, LI Mengyao, GUO Yizheng, SONG Yujiang   

  1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
  • Received:2022-04-22 Online:2023-04-01 Published:2023-03-16
  • Contact: SONG Yujiang E-mail:yjsong@dlut.edu.cn
  • Supported by:
    This work was supported by the Talent Project of Revitalizing Liaoning Province, China(No.XLYC2002067), the Science & Technology Innovation Funds of Dalian City, China(Nos.2020JJ25CY003, 2021JB11GX005), the Key Research and Development Plan of Liaoning Province in 2020, China(No.2020JH2/10100025), and the Fundamental Research Funds for the Central Universities, China (Nos.DUT19ZD208, DUT20ZD208).

Abstract: With the excessive consumption of fossil fuels and the massive emission of CO2, it has led to a series of environmental crises posing a serious threat to sustainable development. Electrochemical CO2 reduction reaction (CO2RR) to ethylene helps solve these serious environmental crises. Herein, we report the synthesis of a copper-based electrocatalyst by pyrolysis of yolk-shell structured HKUST-1 with partial substitution of trimesic acid by benzimidazole(nitrogen source). The electrocatalyst exhibits an ethylene Faradic efficiency(FE) of 25.8% and a partial ethylene current density of 23.7 mA/cm2, in addition, the electrocatalyst can maintain stable performance during 10 h of electrolysis, which are all better than those of the electrocatalyst without nitrogen dopant. According to electrochemical measurements and X-ray photoelectron spectroscopy(XPS), we propose that the nitrogen dopant plays an effective role in stabilizing Cu(I) species and promoting CO2 molecules activation, as well as suppressing the reduction of Cu(I) species during electrolysis. Eventually, the performance of the electrocatalyst toward CO2RR is studied in a flow cell. This work provides a new route for the design of Cu-based electrocatalyst toward electrochemical CO2 conversion into ethylene.

Key words: CO2, Cu MOF, Electrocatalyst, Nitrogen, Ethylene