Preparation of graphene film decorated TiO2 nano-tube array photoelectrode and its enhanced visible light photocatalytic mechanism

被引：123
作者：
Cheng, Xiuwen [1 ]
Liu, Huiling [1 ]
Chen, Qinghua [1 ]
Li, Junjing [1 ]
Wang, Pu [1 ]
机构：
[1] Harbin Inst Technol, State Key Lab Urban Water Resources & Environm SK, Dept Environm Sci & Engn, Harbin 150090, Peoples R China
来源：
CARBON | 2014年 / 66卷
基金：
中国国家自然科学基金;
关键词：
HYDROGEN GENERATION; OXIDE; NANOPARTICLES; DEGRADATION; REDUCTION; PHOTODEGRADATION; NANOSTRUCTURES; POLLUTANTS; EFFICIENCY; SHEETS;
D O I：
10.1016/j.carbon.2013.09.021
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：
Graphene film decorated TiO2 nano-tube array (GF/TiO2 NTA) photoelectrodes were prepared through anodization, followed by electrodeposition strategy. Morphologies and structures of the resulting GF/TiO2 NTA samples were characterized by scanning electrons microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. In addition, the optical and photoelectrochemical properties were investigated through UV-visible light diffuse reflection spectroscopy, photocurrent response and Mott-Schottky analysis. Furthermore, the photodecomposition performances were investigated through yield of hydroxyl radicals and photocatalytic (PC) degradation of methyl blue (MB) under visible light irradiation. It was found that GF/TiO2 NTA photoelectrode exhibited intense light absorption both in UV light and visible region, higher transient photoinduced current of 0.107 mA cm(-2) and charge carrier concentration of 0.84 x 10(19) cm(-3), as well as effective PC performance of 65.9% for the degradation of MB. Furthermore, contribution of several reactive species to the PC efficiency of GF/TiO2 NTA photoelectrode was distinguished. Moreover, the enhanced visible light PC mechanism was proposed and confirmed in detail. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：450 / 458
页数：9
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