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TiO(2) nanotube/Ag-AgBr three-component nanojunction for efficient photoconversion

Authors Hou, Yang
Li, Xinyong
Zhao, Qidong
Quan, Xie
Chen, Guohua View this author's profile
Issue Date 2011
Source Journal of materials chemistry , v. 21, (44), 2011, p. 18067-18076
Summary A TiO(2) nanotube/Ag-AgBr three-component nanojunction with enhanced visible-light activity was synthesized by a two-step approach including an electrochemical anodization technique followed by an in situ photo-assisted dipping and deposition approach. Ag/AgBr nanoparticles with good dispersion were effectively deposited on both the inside and outside of the TiO(2) nanotubes. Surface photovoltage measurements and luminescence spectra demonstrated that the Ag/AgBr loading enhanced the visible spectral absorption of TiO(2) nanotube arrays, as well as their separation efficiency of photoinduced electron-hole pairs, which may due to the nanojunction built between Ag/AgBr and TiO(2) in this system. The photoelectrochemical investigations verified that the TiO(2) nanotube/Ag-AgBr nanojunction showed enhanced photocurrent generation efficiency and had a more effective photoconversion efficiency of 0.71% than the aligned TiO(2) nanotube arrays alone. The enhanced photoelectrochemical properties can be attributed to the extended absorption in the visible light region resulting from Ag/AgBr nanoparticles, and the effective separation of photogenerated carriers driven by the photoinduced potential difference generated at the TiO(2)/Ag-AgBr nanojunction interface.
ISSN 0959-9428
Language English
Format Article
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