Journal
APPLIED SURFACE SCIENCE
Volume 514, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145965
Keywords
WS2/ZnIn2S4 heterojunction; Cocatalyst; Charge separation and transfer; Photocatalytic H-2 evolution
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Funding
- Science and Technology Investigation Project of Hubei Provincial Department of Education, China [D20181805]
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Exploiting the low-cost, abundant and noble-metal-free cocatalysts was still a research hotspot in the photocatalysis field. Herein, few-layer WS2 decorating ZnIn2S4 heterojunctions were successfully fabricated by a twostep procedure including exfoliating bulk WS2 and post-sintering treatment. The multiple characterization techniques were employed to investigate the properties of as-prepared WS2/ZnIn2S4 heterojunctions. The photocatalytic activities were evaluated by H-2 evolution performances, and the results revealed that the activities would be significantly promoted by integrating a little amount of WS2 with ZnIn2S4. Moreover, the optimal loading amount of WS2 was about 3 wt% in the heterojunctions, corresponding to the H-2 evolution rate of 2.55 mmol g(-1)h(-1) and the apparent quantum efficiency (AQE) of 3.2% at 420 nm monochromatic light. Based on the photoelectrochemical and photoluminescence (PL) spectra tests, the effective charge separation and transfer in the WS2/ZnIn2S4 heterojunction were convincingly corroborated, which was beneficial for the improvement of photocatalytic activity. Furthermore, the few-layer WS2 as cocatalysts could also offer the sufficient active sites to facilitate the H-2 evolution. The present work would provide some insights for the development of non-noble-metal cocatalysts in the photocatalysis region.
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