Chinese Journal of Catalysis ›› 2026, Vol. 83: 351-362.DOI: 10.1016/S1872-2067(25)64922-9

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Asymmetric oxygen-bridged Bi-In dual sites for efficient photothermal CO2 methanation

Mang Zhenga, Qi Lia, Qianxi Liub, Huiquan Gub, Mingyang Liua, Qi Liua,*(), Baojiang Jianga,b,*()   

  1. aKey Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China
    bKey Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, Heilongjiang, China
  • Received:2025-08-06 Accepted:2025-10-11 Online:2026-04-05 Published:2026-03-04
  • Contact: Qi Liu, Baojiang Jiang
  • Supported by:
    National Natural Science Foundation of China(U24A20550);National Natural Science Foundation of China(52273264);Key Project of the Heilongjiang Provincial Natural Science Foundation(ZD2024B001)

Abstract:

Photothermal coupling catalytic CO2/H2O to CH4 is recognized as an effective strategy for addressing environmental concerns and energy crisis. However, hydrogen evolution reaction (HER) competition and weak intermediate adsorption limiting CH4 selectivity and yield during the reaction process. Herein, we incorporate Bi into the In2O3 lattice to create an oxygen-bridged asymmetric bimetallic In-O-Bi (In-O-Bi bridge) sites. The optimized Bi/In2O3 catalyst achieves CH4 yield of 214.1 μmol·g-1 with 96.7% selectivity. The exceptional catalytic activity of Bi/In2O3 stems from two key synergistic effects: (1) the cooperative interaction between Bi and In as p-block metals effectively suppress the competing HER, and (2) the unique In-O-Bi bridge configuration induces significant electron delocalization through p-orbital hybridization. This electronic modulation creates highly active catalytic centers, with In sites preferentially facilitating H2O dissociation while Bi sites selectively promote CO2 reduction. Moreover, the electron delocalization effect in the In-O-Bi bridge sites enhances the adsorption and electron transfer capabilities of the Bi/In2O3 surface for key CHO species, and reduces the energy barrier, thereby enabling efficient CH4 production. These findings provide crucial insights into the design of photothermal catalysts, highlighting the transformative potential of oxygen-bridged asymmetric bimetallic units in efficient CO2 methanation and sustainable energy technologies.

Key words: Photothermal catalysis, CO2 methanation, Orbital hybridization, Electron delocalization, In-O-Bi bridge sites