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Solid-State Electrochemical Protonation of SrCoO2.5 into HxSrCoO2.5 (x=1, 1.5, and 2)

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Title: Solid-State Electrochemical Protonation of SrCoO2.5 into HxSrCoO2.5 (x=1, 1.5, and 2)
Authors: Yang, Qian Browse this author
Lee, Joonhyuk Browse this author
Jeen, Hyoungjeen Browse this author
Cho, Hai Jun Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: solid-state electrochemical protonation
optical property
magnetic property
Issue Date: 27-Jul-2021
Publisher: American Chemical Society
Journal Title: ACS Applied Electronic Materials
Volume: 3
Issue: 7
Start Page: 3296
End Page: 3300
Publisher DOI: 10.1021/acsaelm.1c00505
Abstract: Among many transition-metal oxides (TMOs), strontium cobalt oxide (SrCoOx) is a promising active material for advanced memory devices due to the versatile valence state of cobalt ions. Several SrCoOx-based electrochemical devices have been proposed, but solid-state protonation from SrCoO2.5 to HxSrCoO2.5 (x = 1, 1.5, and 2) at room temperature has not been demonstrated thus far due to the absence of an appropriate solid electrolyte. Here, we demonstrate a solid-state electrochemical protonation of SrCoO2.5 using mesoporous amorphous 12CaO center dot 7Al(2)O(3) (CAN) film as the solid electrolyte. The crystalline phase discretely changed from SrCoO2.5 to HSrCoO2.5 (phase A), H1.5SrCoO2.5 (phase B), and H2SrCoO2.5 (phase C) through formation of an intermediate phase of H1.25SrCoO2.5. H1.5SrCoO2.5 (phase B) was colorless transparent and showed weak ferromagnetism. The present results indicate that the CAN film can be used as the solid electrolyte for the protonation treatment of TMOs.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in [ACS Applied Electronic Materials], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [].
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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