Sustainable thermionic O- emission from stoichiometric 12CaO7 Al2O3 with nanoporous crystal structure

Jiang Li, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

We have examined electric field-assisted thermionic emission of oxygen radical anion (O-) and electron from a stoichiometric 12CaO7 Al 2O3 (C12A7). Lattice framework of C12A7 is composed of subnanometer-sized cages that can accommodate extra- framework species with negative charge, such as O-, O2- ions, and electrons. Absence of oxygen gas supply leads to a steady coemission of O- ion and electron with a ratio of ∼3:7. However, the oxygen gas supply markedly enhances the O- ion emission and suppresses the electron emission, realizing a sustainable and high-purity O- ion emission with a current density up to 11 nA cm-2 at 825°C. The O- ion emission accompanies a weak O2- ion emission, which is smaller by ∼130. TheO2 pressure at the rear side controls the concentrations of O- ion and electron on the emission surface as well as their concentrations in the bulk, and in turn, determines their emission intensities.

本文言語英語
ジャーナルJournal of the Electrochemical Society
156
1
DOI
出版ステータス出版済み - 2009
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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