Phase-controlled 1T/2H-MoS2 interaction with reduced TiO2 for highly stable photocatalytic CO2 reduction into CO. (January 2023)

• Record Type: Journal Article
• Authors: Park, Young Ho; Kim, Dongyun; Hiragond, Chaitanya B.; Lee, Junho; Jung, Jin-Woo; Cho, Chang-Hee; In, Insik; In, Su-Il
• Is Part Of: Journal of CO₂ utilization. Volume 67(2023)
• Publication Date: 2023-01
• Subjects: RT reduced titania -- Vo oxygen vacancies -- MRT 1T/2H-MoS2@R-TiO2; Phase control -- Molybdenum disulfide -- 2-dimensional material -- Photocatalyst -- CO2 reduction; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.102324
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: Photocatalytic CO2 reduction is a potential technique for converting solar energy and greenhouse gases into value-added-chemicals. However, limited light absorption and poor charge separation of electron-hole pairs are the main obstacles. Here, we have developed a highly stable, phase-controlled heterostructured photocatalyst of molybdenum sulfide with reduced titania (1T/2H-MoS2 @RT) for CO2 reduction into CO. The optimized 1T/2H-MoS2 @RT produced 1.02 μmol g −1 h −1 (1480.1 ppm g −1 h −1 ) of CO. The catalyst showed ∼5 and ∼19 times higher activity than RT and MoS2, respectively, and excellent stability over 48 h (8 cycles). Our investigation revealed that the combination of phase-controlled MoS2 with RT synergizes the selective conversion of CO2 to CO. MoS2 acts as a visible light sensitizer and electron transport bridge; however, RT extracts electrons from MoS2 because of its lower energy potential. Improved light absorption, CO2 adsorption, and rapid electron-hole separation are responsible for the increased catalytic activity and stability. Graphical Abstract: ga1 Highlights: The phase control of 1T/2H MoS2 @RT made the CO2 conversion stable Change in MoS2 's 1T/2H phase ratio for efficient transformation of CO2 was revealed Different roles of the 1T and 2H phase of MoS2 in photocatalysis were identified The electron trapping in the midgap state of RT for CO2 conversion was demonstrated The electron transfer mechanism in a MoS2 -RT heterojunction is studied