首页|Fast charge transfer kinetics in Sv-ZnIn2S4/Sb2S3 S-scheme heterojunction photocatalyst for enhanced photocatalytic hydrogen evolution
Fast charge transfer kinetics in Sv-ZnIn2S4/Sb2S3 S-scheme heterojunction photocatalyst for enhanced photocatalytic hydrogen evolution
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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 per-formance.Herein,a unique one-dimensional(1D)/two-di-mensional(2D)S-scheme heterojunction containing 1D Sb2S3 nanorods and 2D ZnIn2S4 with affluent sulfur vacancies(denoted as Sv-ZnIn2S4@Sb2S3)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 Sb2S3 and ZnIn2S4 effectively inhibits the recombination of photo-generated electron-hole pairs and abridges the migration distance of charges.As a result,the optimal Sv-ZnIn2S4@Sb2S3 sam-ple achieves H2 evolution activity of 2741.3 mol·h-1·g-1,which is 8.6 times that of pristine ZnIn2S4 and 3.0 times that of the Sv-ZnIn2S4 samples.Based on the experimental result,the photo-reactivity S-scheme mechanism of hydrogen evolution from water splitting with Sv-ZnIn2S4@Sb2S3 is proposed.This work provides an effective method for developing S-scheme heterojunction composites of transition metal sulfide with high hydrogen evolution performance.
ZnIn2S4 nanosheetsS-scheme heterojunctionSulfur vacancyCharge transfer and separationPhotocatalytic H2 evolution
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