Narrow band-gapped perovskite oxysulfide for CO2 photoreduction towards ethane

• Published in: Applied catalysis. B, Environmental Environmental, 2022-11, Vol.316, p.121615, Article 121615
• Main Authors: Xu, Fenghua, Li, Zhenzhen, Zhu, Rilong, Chu, Yanmeng, Pan, Zhipeng, Xia, Sihong, Fu, Junwei, Xiao, Zewen, Ji, Xiaobo, Liu, Min, Weng, Baicheng
• Format: Article
• Language: English
• Subjects: Bandgap; CO2 reduction; Perovskite Oxysulfide; Photocatalysis
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2022.121615

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 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 CO2 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, Ba2Bi1+xTa1-xO6-ySy, is developed through enhancing charge separation for CO2 photoreduction to produce ethane. Enhanced 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 μmol g−1 h−1 with an electron-based selectivity of 65.6%. It also has outstanding stability for both photocatalytic water oxidation and CO2 reduction. [Display omitted] •A new narrow band-gaped and stable perovskite oxysulfide, Ba2Bi1+xTa1-xO6-ySy, was synthesized.•It shows outstanding photocatalytic CO2 reduction performance toward ethane.•C2H6 yield is over 54 μmol g−1 h−1 with an electron-based selectivity of 65.6%.•Enhanced the charge separation promotes phtotocatalytic CO2 reduction towards C2H6.