title: Photocathodic Protection of 304 Stainless Steel by Bi2S3/TiO2Nanotube Films Under Visible Light.
abstract: We report the preparation of TiO2nanotubes coupled with a narrow bandgap semiconductor, i.e., Bi2S3, to improve the photocathodic protection property of TiO2for metals under visible light. Bi2S3/TiO2nanotube 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 Bi2S3deposition cycles on the photoelectrochemical and photocathodic protection properties of the composite films was also studied. Results revealed that the heterostructure comprised crystalline anatase TiO2and orthorhombic Bi2S3and exhibited a high visible light response. The photocurrent density of Bi2S3/TiO2was significantly higher than that of pure TiO2under visible light. The sensitization of Bi2S3enhanced the separation efficiency of the photogenerated charges and photocathodic protection properties of TiO2. The Bi2S3/TiO2nanotubes prepared by SILAR deposition with 20 cycles exhibited the optimal photogenerated cathodic protection performance on the 304 stainless steel under visible light.
authors.affiliation: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, No. 7, Nanhai Road, Qingdao, 266071, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.affiliation: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, No. 7, Nanhai Road, Qingdao, 266071, China. xiutongwang@gmail.com.
authors.forename: Xiutong
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, No. 7, Nanhai Road, Qingdao, 266071, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Qinyi
authors.initials: Q
authors.lastname: Wei
authors.affiliation: Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, No. 7, Nanhai Road, Qingdao, 266071, China.
authors.forename: Baorong
authors.initials: B
authors.lastname: Hou
keywords: Bi2S3; Photocathodic protection; Stainless steel; TiO2 nanotube