open access

https://hdl.handle.net/2115/79908

Macroscopic Visualization of Fast Electrochemical Reaction of SrCoOx Oxygen Sponge

英語

thermopower

2019-12-06

John Wiley & Sons

Advanced Materials Interfaces

6(23)

1901260

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.

学術雑誌論文

Accepted Manuscript

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 https://doi.org/10.1002/admi.201901260 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

2196-7350