Regulating COOH Intermediate via Rationally Constructed Surface-Active Sites of Bi2WO6 for Solar-Driven CO2-to-CO Production
- Citation:
- Thang, NQ, Sabbah A, Putikam R, Huang C-Y, Lin T-Y, Kamal Hussien M, Wu H-L, Lin M-C, Lee C-H, Chen K-H, Chen L-C. 2025. Regulating COOH Intermediate via Rationally Constructed Surface-Active Sites of Bi2WO6 for Solar-Driven CO2-to-CO Production, 2025. Advanced Functional Materials. n/a(n/a):2423751.: John Wiley & Sons, Ltd
Abstract:
Abstract Solar-driven CO2 reduction holds great promise for sustainable energy, yet the role of atomic active sites in governing intermediate formation and conversion remains poorly understood. Herein, a synergistic strategy using Ni single atoms (SAs) and surface oxygen vacancies (Ov) is reported to regulate the CO2 reduction pathway on the Bi2WO6 photocatalyst. Combining in-situ techniques and theoretical modeling, the reaction mechanism and the structure-activity relationship is elucidated. In-situ X-ray absorption spectroscopy identifies Bi and Ni as active sites, and in-situ diffuse reflectance infrared Fourier transform spectroscopy demonstrates that adsorption of H2O and CO2 readily forms CO32? species on the Ov-rich catalyst. Optimally balancing Ni SAs and Ov lowers the energy barrier for the formation and dehydration of a key COOH intermediate, leading to favorable CO formation and desorption. Consequently, a superior CO production efficiency of 53.49 µmol g?1 is achieved, surpassing previous reports on Bi2WO6-based catalysts for gas-phase CO2 photoreduction.
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