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Oxygen defect engineering by current effect assisted with temperature cycling in Perovskite-type La0.7Sr0.3CoO3 Film

Abstract

Introducing and modulating the oxygen deficiency concentration have been received as an effective ways to obtain high catalytic activity in perovskite oxides. However, it is difficult to control over the oxygen vacancy in the conventional oxygen defect engineering due to the harsh reaction conditions at elevated temperatures and reducing atmosphere, which makes it impractical for many technological applications. Here, we report a new approach of oxygen defect engineering, based on the combination of the current effect and temperature cycling under 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 Co4+ state to Co3+ in the film. Further experiments and analysis revealed that oxygen vacancies can be well regulated by combined current effect and temperature cycling in the repeated measurements, which results in the 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 the perovskite-type oxides and brings new opportunities in designing high-efficiency oxidation catalysts.

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Publication details

The article was received on 04 May 2017, accepted on 04 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR03162A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Oxygen defect engineering by current effect assisted with temperature cycling in Perovskite-type La0.7Sr0.3CoO3 Film

    J. Li, J. Wang, H. Kuang, H. Zhang, Y. Zhao, K. Qiao, F. Wang, W. Liu, W. Wang, L. Peng, Y. Zhang, R. Yu, F. Hu, J. Sun and B. Shen, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03162A

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