TiO2 nanotube/Ag-AgBr three-component nanojunction for efficient photoconversion

被引：86

作者：

Hou, Yang ^{[1
,2
]}

Li, Xinyong ^{[1
,2
,3
]}

Zhao, Qidong ^{[1
,2
]}

Quan, Xie ^{[1
,2
]}

Chen, Guohua ^{[3
]}

机构：

[1] Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn MOE, Sch Environm Sci & Technol, Dalian 116024, Peoples R China

[2] Dalian Univ Technol, State Key Lab Fine Chem, Sch Environm Sci & Technol, Dalian 116024, Peoples R China

[3] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2011年 / 21卷 / 44期

基金：

国家高技术研究发展计划(863计划);

关键词：

VISIBLE-LIGHT; ARRAY ELECTRODE; HYDROGEN; PHOTOCATALYST; 4-CHLOROPHENOL; SEMICONDUCTORS; NANOPARTICLES; FABRICATION; GENERATION; TITANIA;

D O I：

10.1039/c1jm12788h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：18067 / 18076

页数：10

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