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Low Temperature Preparation of Ceria Solid Solutions Doubly Doped with Rare-Earth and Alkali-Earth and Their Properties as Solid Oxide Fuel Cells

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Journal of Rare Earths 2003年第4期21卷 461-465页

作者：任引哲蒋凯王海霞孟健苏锵 Chemistry & Environmental Science College The Key Laboratory of Rare Earth Chemistry and Physics

A series of solid electrolytes, (Ce 0.8 Ln 0.2 ) 1- x M x O 2-δ (Ln= La, Nd, Sm, Gd, M:Alkali earth), were prepared by amorphous citrate gel method. XRD patterns indicate that a pure fluorite phase is formed at 800 ℃. The electrical conductivity and the AC impedance spectra were measured. XPS spectra show that the oxygen vacancies increase owing to the MO doping, which results in the increase of the oxygen ionic transport number and conductivity. The performance of ceria based solid electrolyte is improved. The effects of rare earth and alkali earth ions on the electricity were discussed. The open circuit voltages and maximum power density of planar solid oxide fuel cell using (Ce 0.8 Sm 0.2 ) 1-0.05 Ca 0.05 O 2- δ as electrolyte are 0.86 V and 33 mW·cm -2 , respectively.

关键词： ceria solid electrolyte amorphous citrate gel method impedance spectra solid oxide fuel cell rare earths

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Synthesis,Structure and Ionic Conductivity of La2/3-xLi3xMoO4

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Journal of Rare Earths 2003年第4期21卷 458-460页

作者：蒋凯王海霞任引哲郭崇峰孟健任玉芳苏锵 Changchun Institute of Applied Chemistry Xinxiang 453002 The Key Laboratory of Rare Earth Chemistry and Physics Changchun 130022 Linfen 041004 Department of Chemistry The Key Laboratory of Rare Earth Chemistry and Physics Henan Normal University Chinese Academy of Sciences College of Chemistry & Environmental Science Shanxi Normal University China

A series of compounds, La 2/3- x Li 3 x MoO 4, were first prepared. Their structures are tetragonal scheelites with the cationic defects. The cell parameters a, c and values of c/a decrease with the increasing of the substitution amount (3 x ) of lithium ion. Cationic vacancies are getting more as Li + concentration is lower. The diffusion of lithium ion is predominant. The concentration of charge carriers increases with increasing the substitution amount (3 x ) of lithium ion, meanwhile, the concentration of cationic vacancies decreases. The conductivity approaches the best when the substitution amount (3 x ) of lithium ion is about 0.3. The conductivity of La 0.567 Li 0.3 MoO 4 is 6.5×10 -6 S·cm -1 at room temperature.

关键词： inorganic material chemistry rare earth molybdate lithium ion conductor ionic conduction rare earths

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Development of Doped Lanthanum Gallate Solid Electrolytes

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Journal of Rare Earths 2003年第3期21卷 301-306+297页

作者：蒋凯王海霞郑立庆杨林孟健苏锵 Chinese Academy of Sciences Xinxiang 453002 China Changchun College of Chemistry & Environmental Science Chinese Academy of Sciences Changchun 130022 The Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Henan Normal University

Development of the doped lanthanum gallate solid electrolytes in the recent years was reviewed. The structure and oxygen ion transference mechanism were discussed. Effects of alkali earths, transition metals, and impurities on electrical conductivity of the doped lanthanum gallates were also discussed. The applications of doped lanthanum gallate were described. The current problems and corresponding strategies were explored.

关键词： inorganic material chemistry solid electrolyte solid oxide fuel cells doped lanthanum gallate rare earths

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