2D Cu-FeTCPP MOF assembled on ZnTi-LDH to construct 2D/2D direct Z-scheme heterojunction for enhanced photocatalytic CO2 reduction. (15th March 2023)

• Record Type: Journal Article
• Authors: Zhou, Changqing; Yang, Yinbao; Wu, Guang; Mu, Manman; Yin, Xiaohong
• Is Part Of: Solar energy. Volume 253(2023)
• Page Start: 480
• Page End: 490
• Publication Date: 2023-03-15
• Subjects: ZnTi-LDH -- Cu-FeTCPP MOF -- photocatalytic CO2 reduction -- 2D/2D Z-scheme heterojunction; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2023.02.058
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: Cu-FeTCPP MOF was first used as a co-catalyst hybridized with ZnTi-LDH for photocatalytic CO2 reduction. The photocatalytic CO2 reduction activity of the composites in aqueous system is significantly higher than that of ZnTi-LDH and Cu-FeTCPP MOF. The successful construction of a novel 2D/2D Z-scheme heterojunction ZnTi-LDH/Cu-FeTCPP MOF is the key factor to improve the photocatalytic activity. The Z-scheme heterojunction accelerates the directional migration and separation of photogenerated carriers. DFT calculations and experiments verify that different porphyrin metal centers of MOFs affect photocatalytic performance. Abstract: The artificial photocatalysis to convert CO2 into renewable fuels has been of great significance in solving climate crisis and depletion of fossil fuels. The development of Z-scheme photocatalyst is crucial to achieve efficient photocatalytic CO2 reduction. Herein, a 2D/2D Z-scheme ZnTi-LDH/Cu-FeTCPP MOF heterojunction is designed for photocatalytic CO2 reduction without photosensitizer and organic sacrificial agent. The optimized ZnTi-LDH/Cu-FeTCPP MOF photocatalyst exhibits attractive activity with a CO yield of 37.80 μmolg −1, which is 28 and 26 times higher than those of ZnTi-LDH and Cu-FeTCPP MOF respectively. The increased photocatalytic activity is attributed to the contact of Cu-FeTCPP MOF and ZnTi-LDH, which enhances the CO2 adsorption and light utilization. More importantly, the internal electric field created at the contact interface is capable of establishing a direct Z-scheme heterojunction in the ZnTi-LDH/Cu-FeTCPP MOF hybrid to separate photogenerated carriers and boost the redox reactions. Additionally, cycling tests confirm its favorable stability. This study strategies designing effective LDHs/MOFs Z-scheme heterojunction photocatalysts toward CO2 photocatalytic reduction.