固体氧化物燃料电池阳极材料La_(1-x)Sr_xCr_(1-y)Mn_yO_(3-δ)的合成及性能研究(英文)

Preparation and Characterization of La_(1-x)Sr_xCr_(1-y)Mn_yO_(3-δ) Anode Material for Solid Oxide Fuel Cell by Solid State Reaction

采用固相法制备La1-xSrxCr1-yMnyO3-δ(LSCM)固体氧化物燃料电池(SOFC)阳极材料,用TG-DTA和X射线衍射分析仪分析了LSCM材料中钙钛矿相的形成过程,用SEM、直流四探针、交流阻抗等方法对合成材料的结构与性能进行研究。研究结果表明:用固相法制备所得到的非晶产物分别在1250℃和1350℃下烧结15h都能得到单一的钙钛矿相,对LSCM样品电性能研究表明,其电子电导率随温度的升高而增加,在850℃时空气状态下的电子电导率可达29.2S/cm;LSCM交流阻抗图是有由两个半圆组成的,显示出良好的离子电导率.

La1-x Srx Cr1-y Mny O3-δ（LSCM） anode material of solid oxide fuel cell （SOFC） was prepared by solid state reaction method. The microstructure and properties of LSCM was tested via differential thermal analysis （DTA） and thermo-gravimetric analysis （TGA）, X-ray diffraction （XRD）, scanning election microcopy （SEM）, AC impedance and four-probe direct current methods. Single-phase was prepared after being sintered at 1 250 ℃ and 1 350 ℃ for 15 h respectively. The electronic conductivity of LSCM enhanced with the temperature increasing and reached 29.2 S/cm at 850℃ in air. The AC impedance spectra show LSCM has good ionic conductivity.