Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 3, Pages 1381-1391Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b01387
Keywords
Hierarchical; ZnO@ZnS core-shell; Stainless steel wire mesh; Photocatalytic hydrogen production; Visible light
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Funding
- Ministry of Science and Technology [MOST 104-2221-E-035-075]
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Ag2S-coupled ZnO@ZnS core-shell nanorods heterostructures were grown on stainless steel wire mesh substrates along the c-axis by sulfidation of aligned ZnO nanorod arrays as immobilized hierarchical photocatalysts (Ag2S-coupled ZnO@ZnS/metal wire mesh) for photo catalytic H-2 production. The effects of the sulfidation time and AgNO3 precursor concentration on the morphology, crystalline properties, optical property, photocurrent response, and photocatalytic H-2 production activity of the photocatalysts under UV or visible light irradiation, together with the stability of photocatalytic activity for recycled photocatalysts were investigated. In comparison with ZnO/metal wire mesh under the same conditions, the ZnO@ZnS/metal wire mesh photocatalysts showed excellent photocatalytic H-2 production activity that can be attributed to the formation of Ag2S-coupled ZnO-ZnS heterojunctions on conductive metal wire mesh substrate that favors the absorption of light, separation of photogenerated electron-hole pairs, and contact with the reactant solution. The H-2 production rates for Ag2S-coupled ZnO@ZnS/metal wire mesh photocatalysts reached 5870 and 168 mu mol g(-1) h(-1) under UV and visible light irradiation.
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