TiO2nanotube/Ag-AgBr three-component nanojunction for efficient photoconversion

Yang Hou, Xinyong Li, Qidong Zhao, Xie Quan, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

88 Citations (Scopus)

Abstract

A TiO2nanotube/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 TiO2nanotubes. Surface photovoltage measurements and luminescence spectra demonstrated that the Ag/AgBr loading enhanced the visible spectral absorption of TiO2nanotube arrays, as well as their separation efficiency of photoinduced electron-hole pairs, which may due to the nanojunction built between Ag/AgBr and TiO2in this system. The photoelectrochemical investigations verified that the TiO2nanotube/Ag-AgBr nanojunction showed enhanced photocurrent generation efficiency and had a more effective photoconversion efficiency of 0.71% than the aligned TiO2nanotube 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.
Original languageEnglish
Pages (from-to)18067-18076
Number of pages10
JournalJournal of Materials Chemistry
Volume21
Issue number44
DOIs
Publication statusPublished - 28 Nov 2011
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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