Oxygen defect engineering by the current effect assisted with temperature cycling in a perovskite-type La0.7Sr0.3CoO3 film

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	Oxygen defect engineering by the current effect assisted with temperature cycling in a perovskite-type La0.7Sr0.3CoO3 film
	Li, J.; Wang, J.; Kuang, H.; Zhang, H. R.; Zhao, Y. Y.; Qiao, K. M.; Wang, F.; Liu, W.; Wang, W.; Peng, L. C.
刊名	ROYAL SOC CHEMISTRY
	2017-09-21
卷号	9 期号:35 页码:13214-13221
ISSN号	2040-3364
英文摘要	Introducing and modulating the oxygen deficiency concentration have been received as an effective way to obtain high catalytic activity in perovskite oxides. However, it is difficult to control the oxygen vacancy in conventional oxygen defect engineering due to harsh reaction conditions at elevated temperatures and the reducing atmosphere, which make it impractical for many technological applications. Herein, we report a new approach to oxygen defect engineering based on the combination of the current effect and temperature cycling at low temperature. Our investigations revealed that the electrical conductivity of the (011)-La0.7Sr0.3CoO3/PMN-PT film changes continuously from metallicity to insulativity under repeated transport measurements below room temperature, which indicates the transformation of the Co4+ state to Co3+ in the film. Further experiments and analysis revealed that oxygen vacancies can be well regulated by the combined current effect and temperature cycling in repeated measurements, which results in a decrease of Co4+/Co3+ and thus the remarkable variation of conductive properties of the film. Our work provides a simple and highly efficient method to engineer oxygen vacancies in perovskite-type oxides and brings new opportunities in designing high-efficiency oxidation catalysts.; Introducing and modulating the oxygen deficiency concentration have been received as an effective way to obtain high catalytic activity in perovskite oxides. However, it is difficult to control the oxygen vacancy in conventional oxygen defect engineering due to harsh reaction conditions at elevated temperatures and the reducing atmosphere, which make it impractical for many technological applications. Herein, we report a new approach to oxygen defect engineering based on the combination of the current effect and temperature cycling at low temperature. Our investigations revealed that the electrical conductivity of the (011)-La0.7Sr0.3CoO3/PMN-PT film changes continuously from metallicity to insulativity under repeated transport measurements below room temperature, which indicates the transformation of the Co4+ state to Co3+ in the film. Further experiments and analysis revealed that oxygen vacancies can be well regulated by the combined current effect and temperature cycling in repeated measurements, which results in a decrease of Co4+/Co3+ and thus the remarkable variation of conductive properties of the film. Our work provides a simple and highly efficient method to engineer oxygen vacancies in perovskite-type oxides and brings new opportunities in designing high-efficiency oxidation catalysts.
学科主题	Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
语种	英语
资助机构	National Key Research and Development Program of China [2017YFA0303601, 2017YFB0702702, 2014CB643700, 2016YFB0700903, 2016YFA0300701]; National Natural Sciences Foundation of China [11474341, 51531008, 11674378, 51590880]; Key Program and Strategic Priority Research Program of the Chinese cademy of Sciences
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79089]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, J; Hu, FX (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.; Hu, FX (reprint author), Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100190, Peoples R China.; Hu, FX (reprint author), Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China.
推荐引用方式 GB/T 7714	Li, J.,Wang, J.,Kuang, H.,et al. Oxygen defect engineering by the current effect assisted with temperature cycling in a perovskite-type La0.7Sr0.3CoO3 film[J]. ROYAL SOC CHEMISTRY,2017,9(35):13214-13221.
APA	Li, J..,Wang, J..,Kuang, H..,Zhang, H. R..,Zhao, Y. Y..,...&Hu, FX .(2017).Oxygen defect engineering by the current effect assisted with temperature cycling in a perovskite-type La0.7Sr0.3CoO3 film.ROYAL SOC CHEMISTRY,9(35),13214-13221.
MLA	Li, J.,et al."Oxygen defect engineering by the current effect assisted with temperature cycling in a perovskite-type La0.7Sr0.3CoO3 film".ROYAL SOC CHEMISTRY 9.35(2017):13214-13221.