Narrow band-gapped perovskite oxysulfide for CO2 photoreduction towards ethane

Owing to the large bandgap and inappropriate surface absorption energy, few reports can achieve commercially valuable carbon products, especially alkanes, through CO2 photoreduction. Herein, a new narrow band-gapped perovskite oxysulfide, Ba2Bi1}xTa1-xO6-ySy, is developed for CO2 photoreduction to produce ethane. It enhances the charge separation, facilitates the charge transfer, and reduces the reaction energy to *CH3, promoting phtotocatalytic CO2 reduction towards C2H6. The obtained perovskite oxysulfide has a C2H6 yield of over 5.4 mu mol g-1 h-1 with the yield-based selectivity of 30.2% and the electron-based selectivity of 65.6%. It also has outstanding stability for both photocatalytic water oxidation and CO2 reduction. The novel design and construction of a photocatalyst in this work could open new possibility for the practical application of artificial photosynthesis.