Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 335, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122859
Keywords
Heterojunction photocatalysts; Photocatalytic water splitting for H-2; ZnIn2S4/ZnSe heteronanosheets; S-scheme mechanism
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The effects of different band alignments in semiconducting heteronanosheets (HNSs) on photocatalytic water splitting were investigated. The results showed that ZnSe-based HNSs exhibited higher photocatalytic activity compared to ZnS-based HNSs, due to the S-scheme mechanism formed by internal electric field rather than the defect trapping-mediated transfer mechanism. Moreover, the long-lived carrier separation and efficient charge transfer pathways of ZnSe-based HNSs contributed to their superior photocatalytic performance.
The photoinduced carrier transfer mechanism in heterojunction photocatalysts plays a significant role in pho-tocatalytic water splitting. However, the relationships between photocatalytic activity and different band alignments in semiconducting heteronanosheets (HNSs) are rarely reported. Here, we used the ultrathin ZnIn2S4 (ZIS) as a model, and constructed the HNSs such as ZIS/ZnSe, ZIS/ZnS with different band alignments. The time-resolved transient absorption results show that ZIS/ZnSe HNSs exhibited the S-scheme mechanism forming the internal electronic field which has more advantages in HER than the defects state trapping-mediated transfer mechanism in ZIS/ZnS HNSs. The long-lived carrier separation (>3.58 mu s) and efficient charge transfer pathways of ZIS/ZnSe HNSs contribute to a highest photocatalytic performance so far, compared with the ZIS-based photocatalysts. These results could pave the route for the design the functional HNCs with different photoin-duced carrier dynamics to establish the relationships between composite structures and properties.
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