Effect of Co3O4/TiO2 heterojunction photoanode with enhanced photocathodic protection on 304 stainless steel under visible light

doi:10.1016/j.colsurfa.2023.131150

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	Effect of Co3O4/TiO2 heterojunction photoanode with enhanced photocathodic protection on 304 stainless steel under visible light
	Li, Xinran 1,2,3,5; Wang, Xiutong 1,2,3,4; Nan, Youbo 1,2; Sun, Yanan 1,3; Xu, Hui 1,2; Chi, Lifeng 1,3; Huang, Yanliang 1; Duan, Jizhou 1; Hou, Baorong 1,3
刊名	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
	2023-05-05
卷号	664 页码:10
关键词	TiO2 Stainless steel Corrosion Photoelectrochemical Visible light
ISSN号	0927-7757
DOI	10.1016/j.colsurfa.2023.131150
通讯作者	Wang, Xiutong(wangxiutong@qdio.ac.cn)
英文摘要	The Co3O4/TiO2 compound photoanodes were prepared by anodization and low-temperature hydrothermal method for the photocathodic protection of 304 stainless steel (304SS). The effect of Co3O4 loading on corrosion resistance of 304SS in 3.5 wt% NaCl was studied by changing the cobalt nitrate concentration of hydrothermal solutions, where the photoanodes were immersed in 0.1 M Na2S+ 0.2 M NaOH solution during tests. Compared with pure TiO2, Co3O4/TiO2 shows stronger visible-light absorption, higher separation efficiency of photo -carriers, and better corrosion protection in dark. When cobalt nitrate concentration is 1 mM in the reaction solution, the compound exhibits the best protection performance with a coupled potential under illumination/ dark of -0.69/-0.45 VSCE. This enhanced corrosion resistance is not only due to the staggered p-n heterojunction at Co3O4/TiO2 interface but also due to the excellent optical absorption activity and electronic storage capacity of Co3O4. Specifically, the p-n internal electric field drives the photoelectrons to flow to the 304SS under illu-mination. Meanwhile, it triggers the reverse flow once the light is removed. The latter electrons are stored by Co3O4 and then slowly released in the dark, thus realizing the delayed protection. This work provides theoretical support and possible guidance for the design and application of p-n junction photoanode in the photocathodic protection field.
资助项目	MIITC High-tech Ship Research Projects[MC -202003-Z01-02] ; Shandong Key Laboratory of Corrosion Science
WOS关键词	PHOTOELECTROCHEMICAL PROPERTIES ; PHOTOCATALYTIC ACTIVITY ; NANOWIRE ARRAYS ; PERFORMANCE ; COMPOSITE ; DEGRADATION ; STEEL ; FILMS ; CATALYST
WOS研究方向	Chemistry
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001002111300001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/183192]
专题	海洋研究所_海洋腐蚀与防护研究发展中心
通讯作者	Wang, Xiutong
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Marine Corros & Protect, Qingdao 266237, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 5.Sun Yat Sen Univ, Sch Mat, Guangzhou 510006, Peoples R China
推荐引用方式 GB/T 7714	Li, Xinran,Wang, Xiutong,Nan, Youbo,et al. Effect of Co3O4/TiO2 heterojunction photoanode with enhanced photocathodic protection on 304 stainless steel under visible light[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2023,664:10.
APA	Li, Xinran.,Wang, Xiutong.,Nan, Youbo.,Sun, Yanan.,Xu, Hui.,...&Hou, Baorong.(2023).Effect of Co3O4/TiO2 heterojunction photoanode with enhanced photocathodic protection on 304 stainless steel under visible light.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,664,10.
MLA	Li, Xinran,et al."Effect of Co3O4/TiO2 heterojunction photoanode with enhanced photocathodic protection on 304 stainless steel under visible light".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 664(2023):10.