The atomic hydrogen permeability in (CeO2)0.85(CaO)0.15 at high temperatures

Y. Nigara; K. Yashiro; T. Kawada; J. Mizusaki

doi:10.1016/S0167-2738(01)00932-8

The atomic hydrogen permeability in (CeO₂)_0.85(CaO)_0.15 at high temperatures

Y. Nigara, K. Yashiro, T. Kawada, J. Mizusaki

環境科学研究科・先進社会環境学専攻

研究成果: Conference article › 査読

17 被引用数 (Scopus)

抄録

The atomic hydrogen permeability, J_H, in fluorite-type (CeO₂)_0.85(CaO)_0.15 was measured to confirm the influence of CaO concentration in CeO₂ at 1050-1800 K. The decrease of J_H with reducing temperature and the proportionality of log J_H to inverse temperature are suggested. The estimated activation energies are 1.0₅±0.01, 1.3₅±0.02 and 0.2₂±0.04 eV at 1800-1400, 1400-1250 and 1250-1050 K, respectively. The J_H of (CeO₂)_1-X(CaO)_X decreases with increasing X and proportional to X^5/2 at 1800-1300 K under H₂-H₂O atmosphere. H₂ is decomposed to 2H⁺ and 2e^- on the surface of the specimen and they permeate it. They hop between oxygen ions and cerium ions, respectively. It would be difficult for H⁺ to cross over Vö, which was produced by CaO, then J_H decreased with increasing X. (CeO₂)_1-X(CaO)_X would be the electron-proton mixed conductor under H₂-H₂O atmosphere at high temperatures.

本文言語	English
ページ（範囲）	365-370
ページ数	6
ジャーナル	Solid State Ionics
巻	145
号	1-4
DOI	https://doi.org/10.1016/S0167-2738(01)00932-8
出版ステータス	Published - 2001 12月 1
イベント	10th International Conference on Solid State (SSPC10) - Montpellier, France 継続期間: 2000 9月 24 → 2000 9月 28

ASJC Scopus subject areas

化学 (全般)
材料科学（全般）
凝縮系物理学

文献へのアクセス

10.1016/S0167-2738(01)00932-8

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引用スタイル

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title = "The atomic hydrogen permeability in (CeO2)0.85(CaO)0.15 at high temperatures",

abstract = "The atomic hydrogen permeability, JH, in fluorite-type (CeO2)0.85(CaO)0.15 was measured to confirm the influence of CaO concentration in CeO2 at 1050-1800 K. The decrease of JH with reducing temperature and the proportionality of log JH to inverse temperature are suggested. The estimated activation energies are 1.05±0.01, 1.35±0.02 and 0.22±0.04 eV at 1800-1400, 1400-1250 and 1250-1050 K, respectively. The JH of (CeO2)1-X(CaO)X decreases with increasing X and proportional to X5/2 at 1800-1300 K under H2-H2O atmosphere. H2 is decomposed to 2H+ and 2e- on the surface of the specimen and they permeate it. They hop between oxygen ions and cerium ions, respectively. It would be difficult for H+ to cross over V{\"o}, which was produced by CaO, then JH decreased with increasing X. (CeO2)1-X(CaO)X would be the electron-proton mixed conductor under H2-H2O atmosphere at high temperatures.",

keywords = "Activation energy of CeCaO, Electron-proton mixed conductor, Fluorite-type oxide, Hydrogen permeability, Oxygen vacancy concentration, Proton conduction",

author = "Y. Nigara and K. Yashiro and T. Kawada and J. Mizusaki",

year = "2001",

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doi = "10.1016/S0167-2738(01)00932-8",

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TY - JOUR

T1 - The atomic hydrogen permeability in (CeO2)0.85(CaO)0.15 at high temperatures

AU - Nigara, Y.

AU - Yashiro, K.

AU - Kawada, T.

AU - Mizusaki, J.

PY - 2001/12/1

Y1 - 2001/12/1

N2 - The atomic hydrogen permeability, JH, in fluorite-type (CeO2)0.85(CaO)0.15 was measured to confirm the influence of CaO concentration in CeO2 at 1050-1800 K. The decrease of JH with reducing temperature and the proportionality of log JH to inverse temperature are suggested. The estimated activation energies are 1.05±0.01, 1.35±0.02 and 0.22±0.04 eV at 1800-1400, 1400-1250 and 1250-1050 K, respectively. The JH of (CeO2)1-X(CaO)X decreases with increasing X and proportional to X5/2 at 1800-1300 K under H2-H2O atmosphere. H2 is decomposed to 2H+ and 2e- on the surface of the specimen and they permeate it. They hop between oxygen ions and cerium ions, respectively. It would be difficult for H+ to cross over Vö, which was produced by CaO, then JH decreased with increasing X. (CeO2)1-X(CaO)X would be the electron-proton mixed conductor under H2-H2O atmosphere at high temperatures.

AB - The atomic hydrogen permeability, JH, in fluorite-type (CeO2)0.85(CaO)0.15 was measured to confirm the influence of CaO concentration in CeO2 at 1050-1800 K. The decrease of JH with reducing temperature and the proportionality of log JH to inverse temperature are suggested. The estimated activation energies are 1.05±0.01, 1.35±0.02 and 0.22±0.04 eV at 1800-1400, 1400-1250 and 1250-1050 K, respectively. The JH of (CeO2)1-X(CaO)X decreases with increasing X and proportional to X5/2 at 1800-1300 K under H2-H2O atmosphere. H2 is decomposed to 2H+ and 2e- on the surface of the specimen and they permeate it. They hop between oxygen ions and cerium ions, respectively. It would be difficult for H+ to cross over Vö, which was produced by CaO, then JH decreased with increasing X. (CeO2)1-X(CaO)X would be the electron-proton mixed conductor under H2-H2O atmosphere at high temperatures.

KW - Activation energy of CeCaO

KW - Electron-proton mixed conductor

KW - Fluorite-type oxide

KW - Hydrogen permeability

KW - Oxygen vacancy concentration

KW - Proton conduction

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