Z型TiO2/Au/CdS异质结对304不锈钢的光生阴极保护效果研究

许守武, 张红兵, 王镜淇, 张凯丽, 都俐俐, 巩大明, 卢贵武, 邱萍

doi:10.16577/j.issn.1001-1560.2023.0289

材料保护 >

2023 , Vol. 56 >Issue 12: 58 - 64

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0289

试验研究

Z型TiO₂/Au/CdS异质结对304不锈钢的光生阴极保护效果研究

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1. 中国石油大学(北京)油气装备材料失效与腐蚀防护北京市重点实验室2. 国家石油天然气管网集团有限公司3. 中石油长庆油田分公司第三采气厂

邱萍(1979-),博士,教授,主要从事石油、天然气工业领域腐蚀与防腐电化学技术研究以及新能源材料电化学调控研究工作,E-mail:qiuping@cup.edu.cn

收稿日期: 2023-06-20

修回日期: 2023-07-20

录用日期: 2023-08-14

网络出版日期: 2024-01-08

基金资助

国家自然科学基金(52071335, 2462020YXZZ016);中国石油大学优秀青年教师研究项目(2462015YQ0602)资助

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Study on the Photogenerated Cathodic Protection Effect of Z-Scheme TiO₂/Au/CdS Heterojunction on 304 Stainless Steel

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(1. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facilities, China University of Petroleum, Beijing 102249, China;2. China Oil &Gas Pipeline Network Co., Ltd., Beijing 100000, China;3. PetroChina Changqing Oilfield Thrid Gas Plant, Erdos 017300, China)

Received date: 2023-06-20

Revised date: 2023-07-20

Accepted date: 2023-08-14

Online published: 2024-01-08

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摘要

为了提高TiO2对304不锈钢的光生阴极保护性能,采用阳极氧化法在Ti片表面制备TiO2纳米带,再使用离子溅射制备TiO2/Au,然后进一步使用连续离子层吸附反应法制备出Z型TiO2/Au/CdS异质结复合膜。利用X射线衍射仪、扫描电子显微镜、能谱仪、X射线光电子能谱对所制备膜层的晶体结构、表面形貌、元素分布、各元素的价态以及键能进行分析,使用分光光度计分析膜层的光学性质,使用电化学工作站测试膜层对304不锈钢的光生阴极保护性能。结果表明:TiO2/Au(10)/CdS复合膜对304不锈钢的光生阴极保护效果最好,其开路电位为-1.252 V (vs SCE),同时光生电流密度达到2.697 mA/cm2,是纯TiO2 (0.185 mA/cm2)的14倍。TiO2复合Au和CdS后形成了Z型异质结,这种Z型电荷转移机制可以改变光生电子的迁移路径,能促进光生电子与空穴的分离,因此能够为304不锈钢提供有效的阴极保护。

关键词： 304不锈钢; TiO2纳米带; Z型异质结; TiO2/Au/CdS复合膜; 光生阴极保护

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许守武, 张红兵, 王镜淇, 张凯丽, 都俐俐, 巩大明, 卢贵武, 邱萍 . Z型TiO₂/Au/CdS异质结对304不锈钢的光生阴极保护效果研究[J]. 材料保护, 2023 , 56(12) : 58 -64 . DOI: 10.16577/j.issn.1001-1560.2023.0289

Abstract

For improving the photogenerated cathodic protection performance of TiO2 on 304 stainless steel, TiO2 nanobelts were prepared on the surface of Ti sheet by anodization, TiO2/Au films were prepared by ion sputtering, and finally the Z-type heterojunction TiO2/Au/CdS heterojunction composite films were obtained by successive ionic layer adsorption and reaction methods. Meanwhile, X-ray diffractometer, scanning electron microscope, energy spectrometer, and X-ray photoelectron spectroscopy were used to analyze the crystal structure, surface morphology, element distribution, valence state of each element, and bond energy of the prepared films. A spectrophotometer was used to analyze the optical properties of the film, and an electrochemical workstation was employed to evaluate the photogenerated cathodic protection performance of the film on 304 stainless steel. Results showed that the TiO2/Au(10)/CdS composite film had the best photogenerated cathodic protection effect on 304 stainless steel with the open circuit potential of -1.252 V (vs SCE), and the photogenerated current density of 2.697 mA/cm2, which was 14 times that of pure TiO2 (0.185 mA/cm2). Besides, TiO2 combined Au and CdS to form a Z-type heterojunction, and this Z-type charge transfer mechanism could change the migration path of photogenerated electrons and promote the separation of photogenerated electrons and holes, and hence the films could provide effective cathodic protection for 304 stainless steel.

Key words： 304 stainless steel; TiO2 nanobelts; Z-type heterojunction; TiO2/Au/CdS composite films; photogenerated cathodic protection

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