Phase transformation of the brownmillerite SrCoO2.5 thin film through alkaline water electrolysis

A phase transformation from insulating brownmillerite SrCoO 2.5 to conducting perovskite SrCoO 3 through electrochemical oxidation has been demonstrated for thin films of SrCoOx on a SrTiO 3 (001) substrate. The cobalt-oxide film strongly favors the brownmillerite phase of SrCoO 2.5 instead of the p...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2014, 64(12), , pp.1845-1848
Main Authors: Tambunan, Octolia Togibasa, Lee, Min Young, Kim, Deok Hyeon, Parwanta, Kadek Juliana, Jung, Chang Uk
Format: Article
Language:English
Subjects:
Mathematical and Computational Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Theoretical
물리학
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Summary:A phase transformation from insulating brownmillerite SrCoO 2.5 to conducting perovskite SrCoO 3 through electrochemical oxidation has been demonstrated for thin films of SrCoOx on a SrTiO 3 (001) substrate. The cobalt-oxide film strongly favors the brownmillerite phase of SrCoO 2.5 instead of the perovskite phase of SrCoO 3 on a SrTiO 3 (001) substrate due to its low lattice mismatch. Therefore, the phase transformation has its own retention. The alkaline water electrolysis occurs between the copper cathode and the SrCoO 2.5 film anode. The H + ions are attracted to the cathode and generate H 2 gas. The OH − ions are attracted to the film’s surface and generate a rich amount of oxygen to fill the oxygen vacancy channel of brownmillerite SrCoO 2.5 . The phase transformation was verified from the change in the out-of-plane lattice constant and the change in the resistivity of the electrolyzed film.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.64.1845