Interfacial chemical bond and internal electric field modulated Z-scheme S<sub>v</sub>-ZnIn<sub>2</sub>S<sub>4</sub>/MoSe<sub>2</sub> photocatalyst for efficient hydrogen evolution.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34226543.
- Also identified by DOI 10.1038/s41467-021-24511-z and PMC identifier 8257585.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 ZnIn<sub>2</sub>S<sub>4</sub> and MoSe<sub>2</sub> 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<sup>-1</sup>·h<sup>-1</sup> 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.