Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 263-271.DOI: 10.1016/j.jechem.2023.01.017

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In-situ constructing Cu1Bi1 bimetallic catalyst to promote the electroreduction of CO2 to formate by synergistic electronic and geometric effects

Houan Ren, Xiaoyu Wang, Xiaomei Zhou, Teng Wang, Yuping Liu, Cai Wang, Qingxin Guan*, Wei Li*   

  1. College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China
  • Received:2022-11-17 Revised:2022-12-16 Accepted:2023-01-10 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: qingxinguan@nankai.edu.cn (Q. Guan), weili@nankai.edu.cn (W. Li).

Abstract: Electrochemical CO2 reduction to formate is a potential approach to achieving global carbon neutrality. Here, Cu1Bi1 bimetallic catalyst was prepared by a co-precipitation method. It has a ginger like composite structure (CuO/CuBi2O4) and exhibited a high formate faradaic efficiency of 98.07% at -0.98 V and a large current density of -56.12 mA cm-2 at -1.28 V, which is twice as high as Bi2O3 catalyst. Especially, high selectivity (FE-HCOO > 85%) is maintained over a wide potential window of 500 mV. In-situ Raman mea-surements and structure characterization revealed that the reduced Cu1Bi1 bimetallic catalyst possesses abundant Cu-Bi interfaces and residual Bi-O structures. The abundant Cu-Bi interface structures on the catalyst surface can provide abundant active sites for CO2RR, while the Bi-O structures may stabilize the CO2*- intermediate. The synergistic effect of abundant Cu-Bi interfaces and Bi-O species promotes the efficient synthesis of formate by following the OCHO* pathway.

Key words: CO2 electroreduction, Bimetallic catalyst, Formate, Cu-Bi interfaces, Bi-O structure