Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 44, Pages 18067-18076Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12788h
Keywords
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Funding
- National Nature Science Foundation of China [20877013, 20837001, NSFC-RGC 21061160495]
- National High Technology Research and Development Program of China [2010AA064902]
- Major State Basic Research Development Program of China [2011CB936002]
- Liaoning Provincial University [LR2010090]
- Key Laboratory of Industrial Ecology and Environmental Engineering, China Ministry of Education
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A TiO2 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 TiO2 nanotubes. Surface photovoltage measurements and luminescence spectra demonstrated that the Ag/AgBr loading enhanced the visible spectral absorption of TiO2 nanotube arrays, as well as their separation efficiency of photoinduced electron-hole pairs, which may due to the nanojunction built between Ag/AgBr and TiO2 in this system. The photoelectrochemical investigations verified that the TiO2 nanotube/Ag-AgBr nanojunction showed enhanced photocurrent generation efficiency and had a more effective photoconversion efficiency of 0.71% than the aligned TiO2 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 TiO2/Ag-AgBr nanojunction interface.
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