Dehydration of Electrochemically Protonated Oxide: SrCoO2with Square Spin Tubes

Hao Bo Li, Shunsuke Kobayashi, Chengchao Zhong, Morito Namba, Yu Cao, Daichi Kato, Yoshinori Kotani, Qianmei Lin, Maokun Wu, Wei Hua Wang, Masaki Kobayashi, Koji Fujita, Cédric Tassel, Takahito Terashima, Akihide Kuwabara, Yoji Kobayashi, Hiroshi Takatsu, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Controlling oxygen deficiencies is essential for the development of novel chemical and physical properties such as high-Tc superconductivity and low-dimensional magnetic phenomena. Among reduction methods, topochemical reactions using metal hydrides (e.g., CaH2) are known as the most powerful method to obtain highly reduced oxides including Nd0.8Sr0.2NiO2 superconductor, though there are some limitations such as competition with oxyhydrides. Here we demonstrate that electrochemical protonation combined with thermal dehydration can yield highly reduced oxides: SrCoO2.5 thin films are converted to SrCoO2 by dehydration of HSrCoO2.5 at 350 °C. SrCoO2 forms square (or four-legged) spin tubes composed of tetrahedra, in contrast to the conventional infinite-layer structure. Detailed analyses suggest the importance of the destabilization of the SrCoO2.5 precursor by electrochemical protonation that can greatly alter reaction energy landscape and its gradual dehydration (H1-xSrCoO2.5-x/2) for the SrCoO2 formation. Given the applicability of electrochemical protonation to a variety of transition metal oxides, this simple process widens possibilities to explore novel functional oxides.
Original languageEnglish (US)
Pages (from-to)17517-17525
Number of pages9
JournalJournal of the American Chemical Society
Volume143
Issue number42
DOIs
StatePublished - Oct 27 2021
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-13

ASJC Scopus subject areas

  • Biochemistry
  • Colloid and Surface Chemistry
  • General Chemistry
  • Catalysis

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