open access

https://hdl.handle.net/2115/86381

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

英語

magnetic property

2021-07-27

American Chemical Society

ACS Applied Electronic Materials

3(7)

3296-3300

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.

学術雑誌論文

Accepted Manuscript

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 [https://pubs.acs.org/articlesonrequest/AOR-SUGYQND5WHTBWYVHUQPS].