Improved Mass-Transfer Enhances Photo-Driven Dye Degradation and H2 Evolution over a Few-Layer WS2/ZnO
Yu-Ju Huang1, Lian-Ming Lyu1, Cheng-Yi Lin1
1Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan.
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.
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