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Fabrication and Photocathodic Protection Performance of Bi2S3/TiO2 Nanocomposites for 304 Stainless Steel |
YU Jiahui, WANG Tongtong, GAO Yun, GAO Rongjie( ) |
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China |
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Cite this article:
YU Jiahui, WANG Tongtong, GAO Yun, GAO Rongjie. Fabrication and Photocathodic Protection Performance of Bi2S3/TiO2 Nanocomposites for 304 Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 901-908.
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Abstract TiO2 nanotube arrays are decorated with Bi2S3 by a successive ionic layer adsorption and reaction (SILAR) method, aiming to enhance the photoelectric conversion ability of TiO2 and photogenerated cathodic protection performance of TiO2 nanotube arrays for 304 stainless steel. B-(x)/TiO2 nanotubes (x = 1,3,5,7) were prepared by changing the number of deposition cycles of Bi2S3. The morphology, structure, light response ability and photogenerated carrier separation efficiency of Bi2S3/TiO2 nanocomposites were examined by means of XRD, SEM and XPS. At the same time, the photoelectrochemical properties of Bi2S3/TiO2 nanocomposites were tested under simulated sunlight. In addition, the effect of the number of deposition cycles of Bi2S3 on the photocathodic protection performance of TiO2 nanocomposites was also studied. After Bi2S3 modification, the band gap of the composites decreases, and the recombination rate of photogenerated carriers decreases greatly. When a 5 cyclic deposition of Bi2S3 is adopted, the photoelectrochemical properties of the prepared nanocomposites are the best. Of which the band gap is reduced to 2.9 eV, and the photocurrent density is increased from 200 μA·cm-2 to 550 μA·cm-2 under the condition of turning on light, which is 2.75 times that of the bare TiO2 nanotube arrays. After coupling the modified nanocomposite with 304 stainless steel, the coupling potential can be reduced to -1.0 V under simulated sunlight, which is about 80 mV lower than the coupling potential before modification, which can further improve the photogenerated cathodic protection effect on 304 stainless steel.
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Received: 31 August 2023
32134.14.1005.4537.2023.270
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Fund: National Natural Science Foundation of China-Shandong Joint Fund(U1706221) |
Corresponding Authors:
GAO Rongjie, E-mail: dmh206@ouc.edu.cn
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