Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (9): 1393-1400.DOI: 10.1016/S1872-2067(20)63577-X

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Copper-indium bimetallic catalysts for the selective electrochemical reduction of carbon dioxide

Jiaqi Shaoa,b, Yi Wangb, Dunfeng Gaob, Ke Yea,b, Qi Wangc, Guoxiong Wangb   

  1. a Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China;
    b State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    c Liaoning Key Materials Laboratory for Railway, School of Materials and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China
  • Received:2020-01-16 Revised:2020-02-27 Online:2020-09-18 Published:2020-08-08
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21802124 and 91845103), Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science (20180510035), the China Postdoctoral Science Foundation (2018M630307 and 2019T120220) and Excellent Youth Project of Natural Science Foundation of Heilongjiang Province of China (YQ2019B002).

Abstract: Copper-indium bimetallic catalysts with a dendritic structure are fabricated by a two-step electrodeposition method using a hydrogen evolution template for the CO2electroreduction reaction (CO2RR). The dendritic Cu-In-30 catalyst electrodeposited for 30 min shows the highest specific surface area and exposes the most active sites, resulting in improved CO2RR activity. The dendritic Cu-In-30 catalyst exhibits distinctly higher formate partial current density (42.0 mA cm-2) and Faradaic efficiency (87.4%) than those of the In-30 catalyst without the dendritic structure (the formate partial current density and Faradaic efficiency are 4.6 mA cm-2and 57.0%, respectively) at -0.85 V vs. reversible hydrogen electrode, ascribed to the increased specific surface area. The Cu-In-30 catalyst can maintain stable performance for 12 h during the CO2RR. In addition, the intrinsic current density of Cu-In-30 with the dendritic structure (4.8 mA cm-2) is much higher than that of In-30 without the dendritic structure (2.1 mA cm-2), indicating that the dendritic structure promotes the CO2RR, possibly due to additional coordination unsaturated atoms.

Key words: CO2 electroreduction reaction, Copper, Indium, Electrodeposition, Formate