Abstract
A heterostructure of Ti3C2/ZnTCPP/CTFs was constructed by the freeze-drying method and steam-assisted method. In visible light, the hydrogen evolution rate of Ti3C2/ZnTCPP/CTFs-3 was 6.2 times that of ZnTCPP, 4.4 times that of CTFs, 5.6 times that of Ti3C2/ZnTCPP and 1.7 times that of Ti3C2/CTFs. The hydrogen evolution rate of the optimized ternary composite reached 462.6 μmol·g−1·h−1, and the quantum efficiency at 420 nm was 3.34 %. At the same time, the ternary photocatalyst showed high stability. The strong S-type interfacial electric field promoted the separation of space charges between ZnTCPP and CTFs effectively. The two-dimensional Ti3C2 nanosheets, as an Ohmic-junction H2-evolution co-catalyst, provided more electron transfer pathways and a large number of active sites for photocatalysis. This work provides some new ideas and enlightenment for the rational design of efficient Ohmic/S-scheme heterojunction photocatalysts.
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