Interfacial chemical bond and internal electric field modulated Z-scheme Sv-ZnIn2S4/MoSe2 photocatalyst for efficient hydrogen evolution

Abstract Construction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting. 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.

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• 1 However, the conscious modulation of Z-scheme charge transfer is still a great challenge.
• 2 Herein, interfacial Mo-S bond and internal electric field modulated Z-scheme heterostructure composed by sulfur vacancies-rich ZnIn 2 S 4 and MoSe 2 was rationally fabricated for efficient photocatalytic hydrogen evolution.
• 3 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.

This work deepens our understanding of the fundamental laws governing the universe, from subatomic particles to cosmic structures.

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