Construction of Ag₂S/WO₃ Direct Z-Scheme Photocatalyst for Enhanced Charge Separation Efficiency and H₂ Generation Activity
2019
Zhang, Shuai | Wang, Jinming | Chen, Shengtao | Li, Renjie | Peng, Tianyou
Efficient separation and utilization of the photoinduced charge is crucial to the photocatalytic H₂ generation reaction, especially for semiconductors with narrow band gap energies that suffer severe charge recombination. Herein, a novel Ag₂S/WO₃ direct Z-scheme photocatalyst was fabricated by depositing Ag₂S nanoparticles (NPs) on hexagonal WO₃ (h-WO₃) nanorods (NRs) via a precipitation process, which can effectively prevent the agglomeration of Ag₂S NPs, consequently shortening the charge migration pathway and reducing the recombination probability. Also, the Z-scheme mechanism further promotes the charge separation without crippling the redox ability of electron–hole pairs. In virtue of the synergistic effect between the morphology and the Z-scheme mechanism, the optimal Ag₂S/WO₃ photocatalyst exhibits a superior charge separation efficiency and ∼4 times higher photocatalytic H₂ generation activity than that of Ag₂S NPs alone. The present study provides a promising strategy to alleviate the charge recombination and improve the photoactivity of narrow band gap semiconductors by designing hybrid photocatalysts.
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