Photocathodic Protection of 304 Stainless Steel by Bi₂S₃/TiO₂ Nanotube Films Under Visible Light

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• 作者：Hong Li ; Xiutong Wang ; Qinyi Wei ; Baorong Hou
• 关键词：TiO2 nanotube ; Bi2S3 ; Stainless steel ; Photocathodic protection
• 刊名：Nanoscale Research Letters
• 出版年：2017
• 出版时间：December 2017
• 年：2017
• 卷：12
• 期：1
• 全文大小：1389KB
• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X
• 卷排序：12

文摘

We report the preparation of TiO₂ nanotubes coupled with a narrow bandgap semiconductor, i.e., Bi₂S₃, to improve the photocathodic protection property of TiO₂ for metals under visible light. Bi₂S₃/TiO₂ nanotube films were successfully synthesized using the successive ionic layer adsorption and reaction (SILAR) method. The morphology and structure of the composite films were studied by scanning electron microscopy and X-ray diffraction, respectively. UV–visible diffuse reflectance spectra were recorded to analyze the optical absorption property of the composite films. In addition, the influence of Bi₂S₃ deposition cycles on the photoelectrochemical and photocathodic protection properties of the composite films was also studied. Results revealed that the heterostructure comprised crystalline anatase TiO₂ and orthorhombic Bi₂S₃ and exhibited a high visible light response. The photocurrent density of Bi₂S₃/TiO₂ was significantly higher than that of pure TiO₂ under visible light. The sensitization of Bi₂S₃ enhanced the separation efficiency of the photogenerated charges and photocathodic protection properties of TiO₂. The Bi₂S₃/TiO₂ nanotubes prepared by SILAR deposition with 20 cycles exhibited the optimal photogenerated cathodic protection performance on the 304 stainless steel under visible light.