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Fast charge transfer kinetics in Sv-ZnInS/SbS S-scheme heterojunction photocatalyst for enhanced photocatalytic hydrogen evolution

Rare Metals, ISSN: 1867-7185, Vol: 43, Issue: 2, Page: 533-542
2024
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Constructing a S-scheme heterojunction with tight interface contact and fast charge transfer is beneficial to improving the photocatalytic hydrogen evolution performance. Herein, a unique one-dimensional (1D)/two-dimensional (2D) S-scheme heterojunction containing 1D SbS nanorods and 2D ZnInS with affluent sulfur vacancies (denoted as Sv-ZnInS@SbS) was designed. The introduced sulfur vacancy can promote the effective adsorption of H for the following interfacial hydrogen-evolution reaction. Furthermore, the larger contact area and stronger electron interaction between SbS and ZnInS effectively inhibits the recombination of photo-generated electron–hole pairs and abridges the migration distance of charges. As a result, the optimal Sv-ZnInS@SbS sample achieves H evolution activity of 2741.3 mol·h·g, which is 8.6 times that of pristine ZnInS and 3.0 times that of the Sv-ZnInS samples. Based on the experimental result, the photo-reactivity S-scheme mechanism of hydrogen evolution from water splitting with Sv-ZnInS@SbS is proposed. This work provides an effective method for developing S-scheme heterojunction composites of transition metal sulfide with high hydrogen evolution performance.

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