Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (12): 3134-3141.DOI: 10.1016/S1872-2067(22)64116-0

• Articles • Previous Articles     Next Articles

Efficient CO2 fixation with acetophenone on Ag-CeO2 electrocatalyst by a double activation strategy

Anxiang Guana,, Yueli Quana,, Yangshen Chena, Zhengzheng Liua, Junbo Zhanga, Miao Kana, Quan Zhanga, Haoliang Huangb, Linping Qiana, Linjuan Zhangb, Gengfeng Zhenga,*()   

  1. aLaboratory of Advanced Materials, Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis & Innovative Materials, Fudan University, Shanghai 200438, China
    bKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2022-03-29 Accepted:2022-04-27 Online:2022-12-18 Published:2022-10-18
  • Contact: Gengfeng Zheng
  • About author:First author contact:Contributed equally to this work.
  • Supported by:
    National Key Research and Development Program of China(2018YFA0209401);National Natural Science Foundation of China(22025502);National Natural Science Foundation of China(21975051);Science and Technology Commission of Shanghai Municipality(21DZ1206800);Shanghai Municipal Education Commission(2019-01-07-00-07-E00045)

Abstract:

The electrocarboxylation reaction is an attractive means to convert CO2 into valuable chemicals under ambient conditions, while it still suffers from low efficiency due to the high stability of CO2. In this work, we report a double activation strategy for simultaneously activating CO2 and acetophenone by silver-doped CeO2 (Ag-CeO2) nanowires, featuring as an effective electrocatalyst for electrocarboxylation of acetophenone with CO2. Compared to the Ag foil, Ag nanoparticles and CeO2 nanowires, the Ag-CeO2 nanowire catalyst allowed to reduce the onset potential difference between CO2 and acetophenone activation, thus enabling efficient electrocarboxylation to form 2-phenyllactic acid. The Faradaic efficiency for producing 2-phenyllactic acid reached 91% at -1.8 V versus Ag/AgI. This double activation strategy of activating both CO2 and organic substrate molecules can benefit the catalyst design to improve activities and selectivities in upgrading CO2 fixation for higher-value electrocarboxylation.

Key words: Electrocarboxylation, CO2 reduction, Electrocatalyst, Ag-CeO2, Double activation strategy