Chinese Journal of Catalysis ›› 2025, Vol. 72: 199-210.DOI: 10.1016/S1872-2067(24)60287-1

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In-situ distortion of Bi lattice in Bi28O32(SO4)10 cluster boosted electrocatalytic CO2 reduction to formate

Jinghan Suna, Zhengrong Xua, Deng Liua, Aiguo Kongb,*(), Qichun Zhangc,*(), Rui Liua,*()   

  1. aKey Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
    bSchool of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
    cDepartment of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, China
  • Received:2024-12-04 Accepted:2025-02-03 Online:2025-05-18 Published:2025-05-20
  • Contact: *E-mail: agkong@chem.ecnu.edu.cn (A. Kong), qiczhang@cityu.edu.hk (Q. Zhang), ruiliu@tongji.edu.cn (R. Liu).
  • Supported by:
    Fundamental Research Funds for the Central Universities(22120230104)

Abstract:

To convert carbon dioxide into high-value-added liquid products such as formate with renewable electricity (CO2RR) is a promising strategy of CO2 resource utilization. The key is to find a highly efficient and selective electrocatalyst for CO2RR. Herein, clustered Bi28O32(SO4)10 was found to show a high formate Faradaic efficiency (FEformate) of 96.2% at -1.1 VRHE and FEformate above 90% in a wide potential range from -0.9 to -1.3 VRHE in H-type cell, surpassing the corresponding layered Bi2O2SO4 (85.6% FEformate at -1.1 VRHE). The advantageous CO2RR performance of Bi28O32(SO4)10 over Bi2O2SO4 was ascribed to a special two-step in-situ reconstruction process, consisting of Bi28O32(SO4)10 → Bi-2.1/Bi2O2CO3 → Bi-2.1/Bi-0.6 during CO2RR. It gave metallic Bi-2.1 with lattice distortion of -2.1% at the first step and metallic Bi-0.6 with lattice distortion of -0.6% at the second step. In contrast, the usual layered Bi2O2SO4 only formed metallic Bi-0.6 with weaker lattice strain. The metallic Bi-2.1 revealed higher efficiency in stabilizing *CO2 intermediate and reducing the energy barrier of CO2RR, while suppressing hydrogen evolution reaction and CO formation. This work delivers a high-performance cluster-type Bi28O32(SO4)10 electrocatalyst for CO2RR, and elucidates the origin of superior performance of clustered Bi28O32(SO4)10 electrocatalysts compared with layered Bi2O2SO4.

Key words: Inorganic metal-oxygen clusters, Bi28O32(SO4)10, Electrocatalytic CO2 reduction, In-situ reconstruction, Lattice strain