In Situ Fabrication of 3D Octahedral g‐C3N4/BiFeWOx Double‐Heterojunction for Highly Selective CO2 Photoreduction to CO Under Visible Light

Abstract A series of g‐C 3 N 4 /BiFeWO x composites (GN‐x/BFW) with double‐heterojunction composites as photocatalysts for efficient and stable CO 2 photoreduction had been rationally designed and synthesized by the facile in situ hydrothermal method. In situ growing BFW on g‐C 3 N 4 sheets achieved that the g‐C 3 N 4 was embedded in the inner of BFW as well as wrapped on the surfaces of BFW. The obtained heterojunction composites greatly inhibited the recommendation of photogenerated electron/hole pairs and enhanced the light respond on the visible light due to the tight chemically bonded interface interaction. Benefiting from the unique structure, the optimized GN‐5.0 %/BFW heterostructure catalyst showed a higher performance of photoreduction CO 2 to CO (43 μmol h −1 g −1 ) than that of pure BFW (5.2 μmol h −1 g −1 ) and g‐C 3 N 4 (8.9 μmol h −1 g −1 ) under visible light irradiation at 10 °C. Besides, the GN‐x/BFW composites exhibited outstanding recycling photostability and structural stability. A possible Z‐scheme mechanism was proposed according to the staggered band potentials between g‐C 3 N 4 and BFW and ESR results. Similarly, this facile synthetic method could be employed to fabricate other composites to accelerate the photocatalytic performance.