The fabrication, formation mechanisms and applications of novel nanoporous TiO2 membranes prepared by anodization

被引：0

作者：

Yang F. ^{[1
]}

Ding H. ^{[1
]}

Du W. ^{[1
]}

Xie J. ^{[1
]}

Li S. ^{[1
]}

Yu L. ^{[1
]}

Zhang J. ^{[1
]}

Wang H. ^{[1
]}

机构：

[1] Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Technology, Hubei University, Wuhan

来源：

Zhang, Jun (gwen_zhang@126.com) | 1600年 / Chinese Academy of Sciences卷 / 47期

关键词：

Anodization; Dye-sensitized solar cells; Formation mechanism; Nanoporous membrane; Titanium oxide;

D O I：

10.1360/N092016-00280

中图分类号：

学科分类号：

摘要：

In this paper, the TiO2 nanoporous membranes were prepared by a two-step anodization method on Ti foils. The novel overlapped porous nanostructure, core-shell nanotube arrays and normal nanotubes arrays were successively observed during the anodization process. The formation mechanisms of such novel porous nanostructures were proposed based on the results and analysis of the surface morphology, crystallographic structure, X-ray photoelectron spectroscopy analysis and time-dependent current density curves. The overlapped porous nanostructure may originate from the exponential decay of current density during the initial stage. The nanopore diameter significantly depends on the current density; the large current density causes large nanopores on the top layer and the successive deceased current density results in the small nanopores in the under layer. The core-shell nanotubes arrays structure was suggested to relate with the composition and solubility of the anodized nanotubes. From the inner to the outer, each tube consists of several kinds of titanium oxide layers with different composition and different solubility. With further anodization, the inner layer titanium oxide, with high solubility in the electrolyte, could be gradually dissolved by the solution, which results in the formation of the normal nanotubes arrays. The finally obtained stable TiO2 nanotube arrays were used as anodes to assemble dye-sensitized solar cells (DSSCs), and the photovoltaic performance of the cells were studied. The cell based on TiO2 nanotube arrays without any surface modification gives a power conversion efficiency (η) up to 5.88%. After treating the TiO2 nanotube arrays by TiCl4 sol solution, the efficiency of the assembled cell increases to 8.47%, exhibiting a well prospect in energy conversion. © 2017, Science Press. All right reserved.

引用

页码：727 / 737

页数：10

共 42 条

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