Construction of full spectrum-driven CsxWO3/g-C3N4 heterojunction catalyst for efficient photocatalytic CO2 reduction.

• Cs x WO 3 /g-C 3 N 4 catalyst shows full spectrum CO 2 photoreduction activity. • Improved charge separation efficiency is realized on Cs x WO 3 /g-C 3 N 4 catalyst. • LSPR effect is responsible for the NIR photocatalytic activity. Full spectrum-driven Cs x WO 3 /g-C 3 N 4 catalyst was successfully synthesized by the combination of solvothermal and ultrasonication methods and used in CO 2 photocatalytic reduction. The experimental results suggested that 20 wt% Cs x WO 3 /g-C 3 N 4 catalyst possessed the best yield of CH 4 under NIR and full spectrum light irradiation, which were 1.72 and 6.79 μmol·g−1·h−1, respectively. This outstanding photocatalytic activity could be attributed to the localized surface plasmonic resonance effect and the formation of heterojunction structure, which led to the improved charge separation efficiency, good light-harvesting ability and broadened light response. [ABSTRACT FROM AUTHOR]