Ultrastable and Efficient Visible‐light‐driven CO2 Reduction Triggered by Regenerative Oxygen‐Vacancies in Bi2O2CO3 Nanosheets

Abstract Herein, we first design a fast low‐pressure ultraviolet light irradiation strategy for easily regenerating the nearly equivalent surface vacancies. Taking the defective Bi 2 O 2 CO 3 nanosheets as an example, nearly equal amount of oxygen vacancies can be regenerated under UV light irradiation. Synchrotron‐radiation quasi in situ X‐ray photoelectron spectra disclose the Bi sites in the O‐defective Bi 2 O 2 CO 3 nanosheets can act as the highly active sites, which not only help to activate CO 2 molecules, but also contribute to stabilizing the rate‐limiting COOH* intermediate. Also, in situ Fourier transform infrared spectroscopy and in situ mass spectrometry unravel the UV light irradiation contributes to accelerating CO desorption process. As a result, the O‐defective Bi 2 O 2 CO 3 nanosheets achieve a stability up to 2640 h over 110 cycling tests and a high evolution rate of 275 μmol g −1 h −1 for visible‐light‐driven CO 2 reduction to CO.