Visible light photoelectrochemical responsiveness of self-organized nanoporous WO3 films

被引：77
作者：
Li, Wenzhang [1 ]
Li, Jie [1 ]
Wang, Xuan [1 ,2 ]
Luo, Sha [1 ]
Xiao, Juan [1 ]
Chen, Qiyuan [1 ]
机构：
[1] Cent S Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Resources Chem Nonferrous Met, Changsha 410083, Hunan, Peoples R China
[2] Shenyang Aluminum & Magnesium Engn & Res Inst, Shenyang 110001, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2010年 / 56卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Tungsten trioxide; Self-organized nanoporous film; Voltage stepping anodization; Photoelectrochemical property; Electronic conductivity; TIO2 NANOTUBE ARRAYS; ELECTROCHROMIC PROPERTIES; TUNGSTEN TRIOXIDE; ANODIC GROWTH; ANODIZATION; MORPHOLOGY; FABRICATION; TITANIUM; WATER; OXIDE;
D O I：
10.1016/j.electacta.2010.06.025
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Visible light-responsive WO3 nanoporous films with preferential orientation of the (0 0 2) planes were prepared by anodization in neutral F-similar to-containing strong electrolytes. The pore diameter of the self-organized structure was estimated to be in the region of 70-90 nm. Voltages were applied by stepping, which positively influenced passivity breakdown and played a significant role in the formation of self-organized nanoporous films. Under visible light irradiation, the photocurrent density (at 1.6 V vs. Ag/AgCl) and maximum photoconversion efficiency generated by the annealed nanoporous film were 3.45 mA/cm(2) and 0.91%, respectively. The annealed nanoporous WO3 films show maximum incident photon-to-current conversion efficiency of 92% at 340 nm at 1.2 V vs. Ag/AgCl. These values are higher than that of annealed compact WO3 film due to the large interfacial heterojunction area. The photoelectrochemical activities and electronic conductivities were also enhanced by annealing crystallization, which removed the recombination centers. (C) 2010 Elsevier Ltd. All rights reserved.
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页码：620 / 625
页数：6
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