Au-Cu dual-single-atom sites on Bi2WO6 with oxygen vacancy for CO2 photoreduction towards multicarbon products

CO 2 photoreduction into high-value-added C 2+ products struggles with energetic challenges in forming critical intermediates and multiple C−C bonds. Herein, an effectively synthesized photocatalyst , Bi 2 WO 6 nanosheets with oxygen vacancies anchoring Au and Cu dual single atoms on the surface, can convert CO 2 and H 2 O vapour into C 3 H 6 and C 2 H 4 . The high product selectivity of 18.2 % for C 3 H 6 and 65.4 % for total C 2+ hydrocarbons are achieved under concentrated light irradiation (2.4 W·cm −2 ). Au-Cu dual-single-atom sites and defect engineering strategies exhibit synergistic effects on optimizing the reaction thermodynamics and charge kinetics for CO 2 conversion. Theoretical calculations provide reference values for reaction pathways of C 3 H 6 and C 2 H 4 formation, with the C−C couplings being potential determining steps of multicarbon product formation. Our work offers a promising strategy with a combination of concentrated light irradiation technology and catalyst modification to achieve high selectivity of C 2+ products.