Highly Selective Conversion of CO₂ to C₂H₆ by Photocatalytic Reduction with NiAl–Layered Double Hydroxides/Bi₂Sn₂O₇–Ov/CuO–Ov Double Oxygen Vacancy Photocatalyst

Photocatalytic CO 2 reduction is the use of solar energy to catalyze the conversion of CO 2 into a fuel with added value, and it is an effective way to reuse CO 2 to achieve carbon neutrality. In this study, NiAl–layered double hydroxides (LDH)/Bi 2 Sn 2 O 7 –Ov/CuO–Ov composites with double oxygen vacancies are successfully prepared, and the effects of different component contents are investigated. The main products of the best sample NiAl–LDH/BSOv‐40/CuOv‐20 are carbon monoxide, methane, and ethane with yields of 29.95, 18.46, and 32.13 μmol g −1 h −1 , respectively, and a selectivity of 68.15% for the C 2 H 6 product. The evolutionary pathway and photocatalytic mechanism of CO 2 are investigated by in situ Fourier transform infrared spectroscopy and theoretical calculations. In this work, the scope of application of oxygen vacancy catalysts for C 2 production in the field of photocatalysis is broadened.