La1-xSrxCr1-yMnyO3-δ阳极材料的固相合成及导电性能研究

Preparation and Electricity Performance of La_(1-x)Sr_xCr_(1-y)Mn_yO_(3-δ) by Solid State Reaction

采用固相法制备固体中温氧化物燃料电池(SOFC)阳极材料La1-xSrxCr1-yMnyO3-δ(LSCM),用X射线衍射(XRD)分析了LSCM材料中钙钛矿相的形成过程,直流四探针对合成材料的导电性能进行了研究,碘量法测定了材料中的非化学计量值。结果表明:固相法制备所得到的产物分别在1250和1350℃下烧结15h都能得到单一的钙钛矿相;对LSCM样品导电性能研究表明,其电导率随温度的升高而增加,在850℃时空气气氛下的电导率可达22.04S·cm-1;LSCM系列材料的电导率随着氧的非化学计量值的增加而提高。用丝网印刷方式,制备以LSCM为阳极,La1-xSrxGa1-yMgyO3-δ(LSGM)为电解质,La1-xSrxCo1-yFeyO3-δ(LSCF)为阴极的单电池,并对其性能进行测试,最大功率输出密度约100mW·cm-2。

La1-xSrxCr1-yMnyO3-δ （LSCM） anode material of intermediate temperature solid oxide fuel cell （ITSOFC） was prepared by solid state reaction method. The microstructure and conductive performance of LSCM were tested via X-ray diffraction （XRD） and four-probe direct current methods. The oxygen nonstoichiometry was tested by iodometry method. The results showed that homogeneous perovskite phase was obtained after being sintering at both 1250 and 1350 ℃ for 15 h, respectively. And electronic conductivity of LSCM enhanced with the increasing of temperature and the oxygen nonstoichiometry. The total conductivity could reach 22.04 S·cm^-1 at 850 ℃ in air. Electrolyte-supported single cell using LSCM, La1-xSrxGa1-yMgyO3-δ（LSGM） and La1-xSrxCo1-yFeyO3-δ（LSCF） as anode, electrolyte and cathode were prepared respectively by screen printing method and tested briefly, the maximum power output density was about 100 mW·cm^-2.