期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 9, 期 18, 页码 4898-4908出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy01086f
关键词
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资金
- National Natural Science Foundation of China [51801164]
- Fundamental Research Funds for the Central Universities [XDJK2018C001]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2018080]
Core-shell g-C3N4/Pt/TiO2 nanowire structures were successfully synthesized through a facile two-step synthetic methodology, involving photodepositing Pt nanoparticles on the surface of TiO2 nanowires and subsequent growth of g-C3N4 (CN) layers via thermal evaporation of urea. The as-prepared CN/Pt/TiO2 composites show a higher photocurrent density compared to CN/TiO2. The CN/Pt/TiO2 photocatalysts exhibit an enhanced H-2 evolution rate of 8.93 mu mol h(-1) under visible light irradiation, which is 1.25 times higher than that of CN/TiO2 (7.15 mu mol h(-1)), while Pt/TiO2 and TiO2 nanowires do not show any visible light responses. Our experiments demonstrate for the first time that CN/Pt/TiO2 with a unique core-shell nanowire structure of semiconductor-metal-semiconductor enables concurrent hydrogen evolution through photo-induced water splitting and RhB degradation by photo-oxidation in the visible range. This result is probably attributable to the formation of a heterojunction and the Pt nanoclusters in CN/Pt/TiO2, facilitating the electron transfer from the LUMO of g-C3N4 to that of TiO2 and generating different active sites upon photo-absorption in the CN layers. Our work provides a feasible way to obtain H-2 while treating sewage using photocatalysis.
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