Low Temperature Preparation of Ceria Solid Solutions Doubly Doped with Rare-Earth and Alkali-Earth and Their Properties as Solid Oxide Fuel Cells
来源期刊：JOURNAL OF RARE EARTHS2003年第4期
论文作者：苏锵 王海霞 任引哲 蒋凯 孟健
Key words：ceria; solid electrolyte; amorphous citrate gel method; impedance spectra; solid oxide fuel cell; rare earths;
Abstract: A series of solid electrolytes, (Ce0.8Ln0.2)1-xMxO2-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 (Ce0.8Sm0.2)1-0.05Ca0.05O2-δ as electrolyte are 0.86 V and 33 mW*cm-2, respectively.
苏锵1，王海霞2，任引哲2，蒋凯2，孟健1
(1.The Key Laboratory of Rare Earth Chemistry and Physics, Chanchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2.Chemistry & Environmental Science College, Henan Normal University, Xinxiang 453002, China;
3.Chemistry Department, Shanxi Normal University, Linfen 041004, China)
Abstract:A series of solid electrolytes, (Ce0.8Ln0.2)1-xMxO2-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 (Ce0.8Sm0.2)1-0.05Ca0.05O2-δ as electrolyte are 0.86 V and 33 mW*cm-2, respectively.
Key words:ceria; solid electrolyte; amorphous citrate gel method; impedance spectra; solid oxide fuel cell; rare earths;
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