Abstract
Construction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting. However, the conscious modulation of Z-scheme charge transfer is still a great challenge. Herein, interfacial Mo-S bond and internal electric field modulated Z-scheme heterostructure composed by sulfur vacancies-rich ZnIn2S4 and MoSe2 was rationally fabricated for efficient photocatalytic hydrogen evolution. Systematic investigations reveal that Mo-S bond and internal electric field induce the Z-scheme charge transfer mechanism as confirmed by the surface photovoltage spectra, DMPO spin-trapping electron paramagnetic resonance spectra and density functional theory calculations. Under the intense synergy among the Mo-S bond, internal electric field and S-vacancies, the optimized photocatalyst exhibits high hydrogen evolution rate of 63.21 mmol∙g−1·h−1 with an apparent quantum yield of 76.48% at 420 nm monochromatic light, which is about 18.8-fold of the pristine ZIS. This work affords a useful inspiration on consciously modulating Z-scheme charge transfer by atomic-level interface control and internal electric field to signally promote the photocatalytic performance.
Highlights
Construction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting
Finding an alternative energy source is of great significance for the long-term development of human society
At present, the low efficiency, high energy consumption, and environmentally hazardous H2 production technology seriously restrict the commercial application of hydrogen energy
Summary
Construction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting. Taking S vacancies-rich ZnIn2S4 (Sv-ZIS) and MoSe2 as model material, through a defect-induced heterostructure constructing strategy, an interfacial Mo-S bond and internal electric field modulated Z-scheme Sv-ZIS/MoSe2 photocatalyst was fabricated.
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