Superionic Conduction in Co‐Vacant P2‐Na(x)CoO(2) Created by Hydrogen Reductive Elimination

The layered P2‐Na(x)MO(2) (M: transition metal) system has been widely recognized as electronic or mixed conductor. Here, we demonstrate that Co vacancies in P2‐Na(x)CoO(2) created by hydrogen reductive elimination lead to an ionic conductivity of 0.045 S cm(−1) at 25 °C. Using in situ synchrotron X...

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Detalles Bibliográficos
Autores principales: Kato, Kenichi, Kasai, Hidetaka, Hori, Akihiro, Takata, Masaki, Tanaka, Hiroshi, Kitagawa, Susumu, Kobayashi, Akira, Ozawa , Nobuki, Kubo , Momoji, Arikawa, Hidekazu, Takeguchi, Tatsuya, Sadakiyo, Masaaki, Yamauchi, Miho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Communications
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5084920/
https://www.ncbi.nlm.nih.gov/pubmed/27123554
http://dx.doi.org/10.1002/asia.201600370
Descripción
Sumario:The layered P2‐Na(x)MO(2) (M: transition metal) system has been widely recognized as electronic or mixed conductor. Here, we demonstrate that Co vacancies in P2‐Na(x)CoO(2) created by hydrogen reductive elimination lead to an ionic conductivity of 0.045 S cm(−1) at 25 °C. Using in situ synchrotron X‐ray powder diffraction and Raman spectroscopy, the composition of the superionic conduction phase is evaluated to be Na(0.61)(H(3)O)(0.18)Co(0.93)O(2). Electromotive force measurements as well as molecular dynamics simulations indicate that the ion conducting species is proton rather than hydroxide ion. The fact that the Co‐stoichiometric compound Na(x)(H(3)O)(y)CoO(2) does not exhibit any significant ionic conductivity proves that Co vacancies are essential for the occurrence of superionic conductivity.

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