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Improved Mass-Transfer Enhances Photo-Driven Dye Degradation and H2 Evolution over a Few-Layer WS2/ZnO Heterostructure.


ABSTRACT: In this study, we observed the enhanced photocatalytic activity of a few-layer WS2/ZnO (WZ) heterostructure toward dye degradation and H2 production. The few-layer WS2 acted as a co-catalyst that separated photogenerated electron/hole pairs and provided active sites for reactions, leading to the rate of photocatalytic H2 production of WZ being 35% greater than that over the bare ZnO nanoparticles. Moreover, vortex-stirring accelerated the mass-transfer of the reactants, leading to the efficiency of dye photodegradation being 3 times higher than that obtained without high-speed stirring. We observed a similar effect for H2 production, with greater photocatalytic performance arising from the increased mass-transfer of H2 from the catalyst surface to the atmosphere.

SUBMITTER: Huang YJ 

PROVIDER: S-EPMC8771954 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature

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Improved Mass-Transfer Enhances Photo-Driven Dye Degradation and H<sub>2</sub> Evolution over a Few-Layer WS<sub>2</sub>/ZnO Heterostructure.

Huang Yu-Ju YJ   Lyu Lian-Ming LM   Lin Cheng-Yi CY   Lee Guan-Chi GC   Hsiao Kai-Yuan KY   Lu Ming-Yen MY  

ACS omega 20220105 2


In this study, we observed the enhanced photocatalytic activity of a few-layer WS<sub>2</sub>/ZnO (WZ) heterostructure toward dye degradation and H<sub>2</sub> production. The few-layer WS<sub>2</sub> acted as a co-catalyst that separated photogenerated electron/hole pairs and provided active sites for reactions, leading to the rate of photocatalytic H<sub>2</sub> production of WZ being 35% greater than that over the bare ZnO nanoparticles. Moreover, vortex-stirring accelerated the mass-transfer  ...[more]

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