S‐Scheme Heterojunction and Defect Site Engineering on CuxIn5S8−Cu2‐ySe for Highly Efficient Photoreduction of CO2 to methanol. Issue 3 (27th December 2021)

• Record Type: Journal Article
• Authors: Zhao, Hui; Duan, Jihai; Zhang, Zisheng; Wang, Weiwen
• Is Part Of: ChemCatChem. Volume 14:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-27
• Subjects: Cu1.5In4.5S7.5−Cu1.45Se -- defect engineering -- hierarchical transition -- photocatalytic reduction -- S-scheme heterojunction; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202101733
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: The conversion and utilization of CO2 is imminent. Herein, the Cux In5 S8 −Cuy Se S‐scheme heterojunction catalyst was successfully synthesized by the MOF‐derived method and the strategy of surface hydrogenation. In a photocatalytic performance test, Cu1.5 In4.5 S7.5 −Cu1.45 Se has excellent catalytic activity, and the production rate of methanol is 5.250 umol g −1 h −1, and the methanol selectivity is about 100 %. In addition, through DFT calculation and in situ FT‐IR, a new mechanism for the catalytic reduction of CO2 to methanol by bimetallic sites or variable valence metal sites is revealed, which opens up a new strategy to conversion of CO2 into energy fuel. This research couples charge accumulation centers, active sites and adsorption sites on the exposed active interface to enhance the visible light‐driven photocatalytic performance of the catalyst through defect engineering, morphology engineering and heterojunction engineering, which provides a promising approach to facilitate the selective photocatalytic reduction of CO2 to methanol. Abstract : CO2 reduction : The bimetal or variable metal site catalytic reduction of CO2 to produce methanol is proposed. C and O are fixed at the bimetal or variable metal sites, respectively. After activation, COOH* is dehydrated and H is added to become CHO*, and affected by defects, heterojunctions, etc., the surface reconstruction becomes *OCH, and finally H is continuously added to become CH3 OH.