Synthesis and characterization of calcium and manganese-doped rare earth oxide La1-xCaxFe0.9Mn0.1O3-δ for cathode material in IT-SOFC
来源期刊：Journal of Rare Earths2011年第11期
论文作者：赵捷 李晨 孔令龙 吴雪薇 马永昌
文章页码：1066 - 1069
摘 要：In order to develop novel cathode materials with high performance for intermediate temperature SOFC（IT-SOFC）,Ca and Mn doped rare earth oxides La1-xCaxFe0.9Mn0.1O3-δ（x=0.1,0.3 and 0.5,denoted as LCFM9191,LCFM7391 and LCFM5591） were synthesized by solid state reaction（SSR） method.The formation process,phase structure and microstructure of the synthesized samples were characterized using thermogravimetry/differential scanning calorimetry（TG/DSC）,X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The thermal expansion coefficients（TEC） of the samples were analyzed at 100-900 oC by thermal dilatometry.The electrical conductivities of the samples were measured with direct current（DC） four-terminal method from 300 to 850 oC.The results indicated that the samples（x=0.1 and 0.3） exhibited a single phase with orthorhombic and cubic perovskite structure,respectively after being sintered at 1200 oC for 3 h.The electrical conductivity of the samples increased with temperature up to a maximum value,and then decreased.The small polaron hopping was regarded as the conducting mechanism for synthesized samples at T≤600 oC.The negative temperature dependence occurring at higher temperature was due to the creation of oxygen vacancies for charge balance.LCFM7391 had higher mixed conductivity（>100 S/cm） at intermediate temperature and could meet the demand of cathode material for IT-SOFC.In addition,the average TECs of LCFM9191 and LCFM7391 were 11.9×10-6 and 13.1×10-6 K-1,respectively,which had good thermal match to the common electrolytes.
赵捷1,2，李晨1，孔令龙1，吴雪薇1，马永昌1,3
1. School of Materials Science & Engineering,Tianjin University of Technology2. Tianjin Key Lab for Photoelectric Materials and Devices3. Key Laboratory of Display Materials and Photoelectric Devices(Tianjin University of Technology),Ministry of Education
摘 要：In order to develop novel cathode materials with high performance for intermediate temperature SOFC（IT-SOFC）,Ca and Mn doped rare earth oxides La1-xCaxFe0.9Mn0.1O3-δ（x=0.1,0.3 and 0.5,denoted as LCFM9191,LCFM7391 and LCFM5591） were synthesized by solid state reaction（SSR） method.The formation process,phase structure and microstructure of the synthesized samples were characterized using thermogravimetry/differential scanning calorimetry（TG/DSC）,X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The thermal expansion coefficients（TEC） of the samples were analyzed at 100-900 oC by thermal dilatometry.The electrical conductivities of the samples were measured with direct current（DC） four-terminal method from 300 to 850 oC.The results indicated that the samples（x=0.1 and 0.3） exhibited a single phase with orthorhombic and cubic perovskite structure,respectively after being sintered at 1200 oC for 3 h.The electrical conductivity of the samples increased with temperature up to a maximum value,and then decreased.The small polaron hopping was regarded as the conducting mechanism for synthesized samples at T≤600 oC.The negative temperature dependence occurring at higher temperature was due to the creation of oxygen vacancies for charge balance.LCFM7391 had higher mixed conductivity（>100 S/cm） at intermediate temperature and could meet the demand of cathode material for IT-SOFC.In addition,the average TECs of LCFM9191 and LCFM7391 were 11.9×10-6 and 13.1×10-6 K-1,respectively,which had good thermal match to the common electrolytes.
关键词：
