J. Mater. Sci. Technol. ›› 2025, Vol. 224: 159-168.DOI: 10.1016/j.jmst.2024.10.046

• Research Article • Previous Articles     Next Articles

Highly effective CO2 electroreduction to formate boosted by Ce-doping on Indium oxide electrocatalysts

Ziyuan Yanga, Yuxia Jina, Xiaowei Anc, Zhongbao Fengb,d, Peng Luoa, Yusrin Ramlia, Changrui Fenga, Yifan Zhoua, Juan Zhanga, Shasha Lie, Peifen Wangc, Xiao Duf, Xiaogang Haof, Abuliti Abudulaa, Guoqing Guana,b,*   

  1. aGraduate School of Science and Technology, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan;
    bEnergy Conversion Engineering Laboratory, Institute of Regional Innovation, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan;
    cCollege of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    dKey Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China;
    eCollege of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;
    fCollege of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2024-09-01 Revised:2024-10-21 Accepted:2024-10-31 Published:2025-07-20 Online:2024-12-03
  • Contact: *E-mail address: guan@hirosaki-u.ac.jp (G. Guan)

Abstract: Electrocatalytic reduction of carbon dioxide (CO2) with high selectivity to generate value-added chemical products and fuels, utilizing renewable electricity sources, offers an effective approach to address the continued increase in atmospheric CO2. Here, we report cerium (Ce)-doped indium oxide (In2O3) electrocatalyst generated in situ on carbon paper (Ce-In2O3/CP), and its application in the electrochemical reduction of CO2 (CO2RR) to formate formation with high Faradaic efficiency (FE) (reaching 97.6 % at -1.7 V vs. Ag/AgCl) and excellent stability. Experimental analysis and density functional theory (DFT) calculations indicate that doping Ce onto the (222) plane of In2O3 induces lattice distortion, which promotes electron transfer from Ce to In while adjusting the local electronic structure of the In atoms around Ce, making them more favorable for the adsorption of *OOCH intermediates and effectively lowering the energy barrier of the rate-determining step. Furthermore, Ce doping lowers the overpotential required for formate production and suppresses the hydrogen evolution reaction (HER), effectively enhancing the selectivity of formate.

Key words: Electrochemical CO2 reduction, Ce-doped In2O3, Formate, High selectivity, DFT calculation