Bi2S3/CdS/TiO2 纳米复合材料的制备及对304不锈钢的光生阴极保护性能研究

doi:10.11902/1005.4537.2023.114

中国腐蚀与防护学报

2024, Vol. 44

Issue (2): 372-380 CSTR: 32134.14.1005.4537.2023.114 DOI: 10.11902/1005.4537.2023.114

研究报告

本期目录 | 过刊浏览

Bi₂S₃/CdS/TiO₂ 纳米复合材料的制备及对304不锈钢的光生阴极保护性能研究

叶梦颖, 于佳汇, 王彤彤, 高荣杰(

)

中国海洋大学材料科学与工程学院青岛 266100

Fabrication and Photocathodic Protection Performance of Bi₂S₃/CdS/TiO₂ Nanocomposites for 304 Stainless Steel

YE Mengying, YU Jiahui, WANG Tongtong, GAO Rongjie(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

引用本文:

叶梦颖, 于佳汇, 王彤彤, 高荣杰. Bi₂S₃/CdS/TiO₂ 纳米复合材料的制备及对304不锈钢的光生阴极保护性能研究[J]. 中国腐蚀与防护学报, 2024, 44(2): 372-380.
Mengying YE, Jiahui YU, Tongtong WANG, Rongjie GAO. Fabrication and Photocathodic Protection Performance of Bi₂S₃/CdS/TiO₂ Nanocomposites for 304 Stainless Steel[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 372-380.

全文: PDF(7919 KB) HTML

摘要:

通过超声辅助连续离子层吸附和反应法在TiO₂纳米管上负载CdS和Bi₂S₃，通过SEM、XRD、XPS等手段对材料的形貌、结构、元素组成和价态进行表征，在模拟太阳光下，系统研究TiO₂纳米复合材料的电化学性能。结果表明，负载CdS和Bi₂S₃的TiO₂纳米复合材料的光吸收范围扩展到可见光区，载流子的复合率也大大降低，光电流密度提升至850 μA·cm^-2，是改性前的3.4倍；将其与304不锈钢耦合后，电位降至-0.99 V，比改性前的耦合电位低约70 mV，可以进一步提升对304不锈钢的光生阴极保护效果。

关键词 ：光生阴极保护, 改性, Bi₂S₃/CdS/TiO₂, 304不锈钢

Abstract：

TiO₂ nanotube arrays are decorated with CdS and Bi₂S₃ by an ultrasonic-assisted successive ionic layer adsorption and reaction (SILAR) method aiming to enhance thephotoelectric conversion ability of TiO₂ and correspondingly the photogenerated cathodic protection performance for 304 stainless steel. The morphology, structural, element type and valence state of the TiO₂ nanocomposites are characterized by SEM, XRD and XPS, the photoelectrochemical performance of nanocomposites is studied systematically under irradiation of a simulated sunlight. The results indicate that the TiO₂nanocomposites decorated with proper amount of CdS and Bi₂S₃ by an optimal procedure exhibit the best performance, namely, the band gap is reduced to 2.4 eV, the light absorption range extends to the visible region, and the recombination rate of charge photogenerated carriers is greatly reduced. The electrochemical test results show that Bi₂S₃/CdS/TiO₂ nanocomposites have the lowest charge transfer resistance and the fastest electron transfer rate, and the photocurrent density is enhanced to 850 μA·cm^-2 under the condition of turning on light, which is 11.8% higher than that of CdS/TiO₂ nanocomposites and 3.4 times that of TiO₂ nanotube arrays. After coupling the nanocomposite with 304 stainless steel, the potential can be reduced to -0.99 V under simulated sunlight, which is about 70 mV lower than that with the undecorated TiO₂ nanocomposites, and it can further enhance the photogenerated cathodic protection effect on 304 stainless steel.

Key words： photogenerated cathodic protection modification Bi₂S₃/CdS/TiO₂ 304 stainless steel

收稿日期: 2023-04-14 32134.14.1005.4537.2023.114

ZTFLH:

TG174

通讯作者: 高荣杰，E-mail:dmh206@ouc.edu.cn，研究方向为海洋腐蚀与防护，阴极保护

Corresponding author: GAO Rongjie, E-mail:dmh206@ouc.edu.cn

作者简介: 叶梦颖，女，1998年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.114 或 https://www.jcscp.org/CN/Y2024/V44/I2/372

图1 TiO2纳米管阵列的制备过程示意图

图2 Bi2S3/CdS/TiO2纳米复合材料的制备过程示意图

图3 电化学测试装置示意图

图4 TiO2纳米管以及C-15/TiO2、B-3/C-15/TiO2纳米复合材料的XRD图谱

图5 TiO2纳米管及C-15/TiO2和B-3/C-15/TiO2纳米复合材料的SEM形貌及B-3/C-15/TiO2纳米复合材料的EDS谱

图6 B-3/C-15/TiO2纳米复合材料的元素分布图

图7 B-3/C-15/TiO2纳米复合材料的XPS图谱

图8 TiO2纳米管及TiO2纳米复合材料的紫外-可见漫反射谱和相应的Tauc曲线图

图9 TiO2纳米管及TiO2纳米复合材料的光致发光光谱

图10 TiO2纳米管及TiO2纳米复合材料在间歇可见光下的光生电流密度-时间曲线

图11 TiO2纳米复合材料耦合304不锈钢电极在间歇可见光下的电位变化及B-3/C-15/TiO2电位长期稳定性测试

图12 模拟太阳光下TiO2纳米复合材料的Nyquist图及等效电路图

表1 电化学阻抗谱拟合参数

图13 Bi2S3、CdS以及TiO2半导体的能带结构示意图

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