Low temperature preparation and fuel cell properties of rare earth doped barium cerate solid electrolytes  

作　　者：蒋凯 何志奇 孟建 任玉芳 苏锵 

出　　处：《Science China Chemistry》1999年第3期298-304,共7页中国科学（化学英文版）

基　　金：Project supported by the State Key Program for Basic Research;the National Natural Science Foundation of China (Grant No. 29741002)

摘　　要：The solid electrolytes, BaCe0.8Ln0.2O2.9(Ln: Gd, Sm, Eu), were prepared by the sol-gel method. XRD indicated that a pure orthorhombic phase was formed at 900°C. The synthesis temperature by the sol-gel method was about 600°C lower than the high temperature solid phase reaction method. The electrical conductivity and impedance spectra were measured and the conduction mechanism was studied. The grain-boundary resistance of the solid electrolyte could be reduced or eliminated by the sol-gel method. The conductivity of BaCe0.8Gd0.2O2.9 is 7.87 × 10-2 S· cm-1 at 800°C. The open-rireuit voltage of hydrogen-oxygen fuel cell using BaCe0.8Gd0.2O2.9 as electrolyte was near to 1 V and its maximum power density was 30 mW· cm-2.The solid electrolytes, BaCe_0.8 Ln_0.2O_2.9 （Ln: Gd, Sm, Eu）, were prepared by the sol-gel method. XRD indicated that a pure orthorhombic phase was formed at 900℃. The synthesis temperature by the sol-gel method was about 600℃ lower than the high temperature solid phase reaction method, The electrical conductivity and impedance spectra were measured and the conduction mechanism was studied. The grain-boundary resistance of the solid electrolyte could be reduced or eliminated by the sol-gel method. The conductivity of BaCe_0.8Gd_0.2O_2.9 is 7.87×10^-2 S·cm^-1 at 800℃. The open-circuit voltage of hydrogen-oxygen fuel cell using BaCe_0.8 Gd_0.2O_2.9 as electrolyte was near to 1 V and its maximum power density was 30 mW·cm^-2.

关 键 词：BACEO3 solid electrolyte fuel cell impedance spectra sol-gel method 

分 类 号：O646[理学—物理化学]