Significantly enhanced photoelectrochemical cathodic protection performance of hydrogen treated Cr-doped SrTiO3 by Cr6+ reduction and oxygen vacancy modification

doi:10.1016/j.electacta.2019.03.020

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	Significantly enhanced photoelectrochemical cathodic protection performance of hydrogen treated Cr-doped SrTiO3 by Cr6+ reduction and oxygen vacancy modification
	Jing, Jiangping 1,3,5; Chen, Zhuoyuan 1,3,5; Bu, Yuyu 2; Sun, Mengmeng 1,5; Zheng, Wenqiang 4; Li, Weibing 4
刊名	ELECTROCHIMICA ACTA
	2019-05-01
卷号	304 页码:386-395
关键词	Cr doped-SrTiO3 Hydrogen treatment Photoelectrochemical cathodic protection Cr6+ reduction Oxygen vacancy
ISSN号	0013-4686
DOI	10.1016/j.electacta.2019.03.020
通讯作者	Chen, Zhuoyuan(zychen@qdio.ac.cn) ; Bu, Yuyu(yybu@xidian.edu.cn)
英文摘要	SrTiO3 is a promising material for the photoelectrochemical (PEC) cathodic protection technology due to its intrinsic band structure. Its disadvantage of light absorption only in the ultraviolet region can be effectively solved by Cr doping. The Cr dopant usually exists as two states of Cr3+ and Cr6+, among which the latter one usually behaves as the trapping center for the photoinduced electrons and leads to the decrease of the PEC performance. In this paper, a hydrogen treatment process is performed on the Cr-doped SrTiO3 to reduce the Cr6+. It is verified that hydrogen treatment reduces Cr6+ to Cr3+, leading to the increase of the concentration of the charge carriers and the decrease of the charge transfer resistance. And also, hydrogen treatment induces the formation of oxygen vacancy, which leads to the negative shift of conduction band potential and the increase of the concentration of the charge carriers. The effect of the hydrogen treatment temperature is further studied in this work. Higher temperature will promote the reduction degree of Cr6+ and increase the concentration of oxygen vacancy. However, hydrogen treatment with excessively high temperature will induce too high concentration of oxygen vacancy, which would act as the recombination centers of the photogenerated charge carriers, suppress the mobility conduction and thus lead to the decrease of the PEC performance. Therefore, benefiting from the Cr6+ reduction and modification with appropriate concentration of oxygen vacancy, the Cr-doped SrTiO3 with hydrogen treatment at 250 degrees C shows the optimal PEC cathodic protection performance in NaCl solution. (C) 2019 Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[41506093] ; National Natural Science Foundation of China[41676069] ; Qingdao Innovative Leading Talent Foundation[15-10-3-15-(39)-zch] ; Qingdao Science and Technology Achievement Transformation Guidance Plan (Applied Basic Research)[14-2-4-4-jch] ; State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, China[614290101011703]
WOS研究方向	Electrochemistry
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000461909000042
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/154959]
专题	海洋研究所_海洋腐蚀与防护研究发展中心
通讯作者	Chen, Zhuoyuan; Bu, Yuyu
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, 7 Nanhai Rd, Qingdao 266071, Peoples R China 2.Xidian Univ, Sch Microelect, Key Lab Wide Band Gap Semicond Mat & Devices, Xian, Peoples R China 3.Luoyang Ship Mat Res Inst, State Key Lab Marine Corros & Protect, Wenhai Rd, Qingdao 266237, Peoples R China 4.Qingdao Univ Sci & Technol, Sch Environm & Safety Engn, 53 Zhengzhou Rd, Qingdao 266042, Peoples R China 5.Chinese Acad Sci, Ctr Ocean Megasci, 7 Nanhai Rd, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Jing, Jiangping,Chen, Zhuoyuan,Bu, Yuyu,et al. Significantly enhanced photoelectrochemical cathodic protection performance of hydrogen treated Cr-doped SrTiO3 by Cr6+ reduction and oxygen vacancy modification[J]. ELECTROCHIMICA ACTA,2019,304:386-395.
APA	Jing, Jiangping,Chen, Zhuoyuan,Bu, Yuyu,Sun, Mengmeng,Zheng, Wenqiang,&Li, Weibing.(2019).Significantly enhanced photoelectrochemical cathodic protection performance of hydrogen treated Cr-doped SrTiO3 by Cr6+ reduction and oxygen vacancy modification.ELECTROCHIMICA ACTA,304,386-395.
MLA	Jing, Jiangping,et al."Significantly enhanced photoelectrochemical cathodic protection performance of hydrogen treated Cr-doped SrTiO3 by Cr6+ reduction and oxygen vacancy modification".ELECTROCHIMICA ACTA 304(2019):386-395.