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 CO 2 photoreduction. Herein, a new narrow band-gapped perovskite oxysulfide, Ba 2 Bi 1+ x Ta 1- x O 6- y S y , is developed for CO 2 photoreduction to produce ethane. It enhances the charge separation, facilitates the charge transfer, and reduces the reaction energy to *CH 3 , promoting phtotocatalytic CO 2 reduction towards C 2 H 6 . The obtained perovskite oxysulfide has a C 2 H 6 yield of over 5.4 μmol 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 CO 2 reduction. The novel design and construction of a photocatalyst in this work could open new possibility for the practical application of artificial photosynthesis. A new narrow band-gaped perovskite oxysulfide, Ba 2 Bi 1+ x Ta 1- x O 6- y S y , is developed through enhancing charge separation for CO 2 photoreduction to produce ethane. Enhanced the charge separation facilitates the charge transfer, and reduces the reaction energy to *CH 3 , promoting phtotocatalytic CO 2 reduction towards C 2 H 6 . The obtained perovskite oxysulfide has a C 2 H 6 yield of over 5.4 μmol g −1 h −1 with an electron-based selectivity of 65.6%. It also has outstanding stability for both photocatalytic water oxidation and CO 2 reduction. • A new narrow band-gaped and stable perovskite oxysulfide, Ba 2 Bi 1+ x Ta 1- x O 6- y S y , was synthesized. • It shows outstanding photocatalytic CO 2 reduction performance toward ethane. • C 2 H 6 yield is over 54 μmol g −1 h −1 with an electron-based selectivity of 65.6%. • Enhanced the charge separation promotes phtotocatalytic CO 2 reduction towards C 2 H 6 .