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Issue 44, 2011
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TiO2 nanotube/Ag–AgBr three-component nanojunction for efficient photoconversion

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Abstract

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.

Graphical abstract: TiO2 nanotube/Ag–AgBr three-component nanojunction for efficient photoconversion

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Publication details

The article was received on 17 Jun 2011, accepted on 06 Sep 2011 and first published on 13 Oct 2011


Article type: Paper
DOI: 10.1039/C1JM12788H
Citation: J. Mater. Chem., 2011,21, 18067-18076
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    TiO2 nanotube/Ag–AgBr three-component nanojunction for efficient photoconversion

    Y. Hou, X. Li, Q. Zhao, X. Quan and G. Chen, J. Mater. Chem., 2011, 21, 18067
    DOI: 10.1039/C1JM12788H

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