title: Plasmonic Ag deposited TiO2 nano-sheet film for enhanced photocatalytic hydrogen production by water splitting.
abstract: TiO2 nano-sheet film (TiO2 NSF) was prepared by a hydrothermal method. Ag nanoparticles (NPs) were then deposited on the surface of TiO2 NSF (Ag/TiO2 NSF) under microwave-assisted chemical reduction. The prepared samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible (UV-vis) absorption spectroscopy, x-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, and Raman scattering spectroscopy. The results revealed that the Ag NPs were well dispersed on the anatase/rutile mixed-phase TiO2 nano-sheet surface with a metallic state. The visible light absorption and Raman scattering of TiO2 were enhanced by Ag NPs based on its surface plasmon resonance effect. Besides, Ag NPs could also effectively restrain the recombination of photogenerated electrons and holes. Photocatalytic water splitting was conducted on the films to obtain hydrogen, and the experimental results indicated that plasmonic Ag NPs could greatly enhance the photocatalytic activity of TiO2 due to the synergistic effect between electron transfer and surface plasmon resonance enhanced absorption. The hydrogen yield obtained from the optimal sample reached 8.1 μmol cm(-2) and the corresponding energy efficiency was about 0.47%, which was 8.5 times higher than that of pure TiO2 film. Additionally, the formation mechanism of TiO2 nano-sheet film is preliminarily discussed.
authors.affiliation: School of Chemical Engineering, Northwest University, No 229 Taibai North Road, Xi'an, Shaanxi 710069, People's Republic of China.
authors.forename: Enzhou
authors.initials: E
authors.lastname: Liu
authors.forename: Limin
authors.initials: L
authors.lastname: Kang
authors.forename: Yuhao
authors.initials: Y
authors.lastname: Yang
authors.forename: Tao
authors.initials: T
authors.lastname: Sun
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Hu
authors.forename: Changjun
authors.initials: C
authors.lastname: Zhu
authors.forename: Hanchen
authors.initials: H
authors.lastname: Liu
authors.forename: Qiuping
authors.initials: Q
authors.lastname: Wang
authors.forename: Xinghua
authors.initials: X
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Fan