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Macroscopic Visualization of Fast Electrochemical Reaction of SrCoOx Oxygen Sponge

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Title: Macroscopic Visualization of Fast Electrochemical Reaction of SrCoOx Oxygen Sponge
Authors: Yang, Qian Browse this author
Cho, Hai Jun Browse this author
Jeen, Hyoungjeen Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: conductive AFM
electrochemical oxidation
Issue Date: 6-Dec-2019
Publisher: John Wiley & Sons
Journal Title: Advanced Materials Interfaces
Volume: 6
Issue: 23
Start Page: 1901260
Publisher DOI: 10.1002/admi.201901260
Abstract: Strontium cobaltite (SrCoOx) is known as a material showing fast topotactic electrochemical redox reaction so-called 'oxygen sponge'. Although atomic scale phenomenon of the oxidation of SrCoO2.5 into SrCoO3 is known, the macroscopic phenomenon has not been clarified yet thus far. Here, the electrochemical oxidation of SrCoOx is visualized macroscopically. SrCoOx epitaxial films with various oxidation states are prepared by the electrochemical oxidation of SrCoO2.5 film into SrCoO3-delta film. Steep decrease of both resistivity and the absolute value of thermopower of electrochemically oxidized SrCoOx epitaxial films indicate the columnar oxidation first occurred along with the surface normal and then spread in the perpendicular to the normal. Further, the phenomena are directly visualized using the conductive atomic force microscopy. This macroscopic imaging of the electrochemical oxidation will be useful to develop a functional device utilizing the electrochemical redox reaction of SrCoOx.
Rights: This is the peer reviewed version of the following article: Yang, Q., Cho, H. J., Jeen, H., Ohta, H., Macroscopic Visualization of Fast Electrochemical Reaction of SrCoOx Oxygen Sponge. Adv. Mater. Interfaces 2019, 6, 1901260., which has been published in final form at . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 太田 裕道

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