摘要
以La2O3,MnO2和SrCO3为原料,通过固相反应合成SOFC的阴极粉料LSM,利用XRD,TGA/DTA热分析仪等现代分析仪器研究了该材料的反应历程.结果发现,实验过程首先出现了La2SrOx相,并在350～1000℃的较大范围内一直存在,到800℃时才出现LaMnO3.通过分析研究,反应过程先是La2O3+SrCO3→La2SrOx+Co2,然后为La2O3+MnO2→LaMnO3,,最后发生La2SrOx和LaMnO3向La1-xSrxMnO3转化.这一结果与人们一致公认的反应历程,即先发生La2O3+MnO2→LaMnO3,然后是LaMnO3+SrCO3→La1-xSrxMnO3有较大差异.
The cathode LSM powders of solid state fuel cells (SOFC) were manufactured from solid state reaction materials such as La2O3, MnO2, and SrCO3. The modern instrument, such as XRD, TGA/DTA etc, were used to research the processing steps of LSM fine powders. During the processing, there was La2SrOxexisted, no LaMnO3. The reaction steps were described as follows. First, La2O3+SrCO3→La2SrOx+CO2, andthen La2SrOx+MnO2→La1-xSrxMnO3, finally got La1-xSrxMnO3. This result is different from the recognizedsteps during the LSM processing, in which La2O3+MnO2→LaMnO3 first, and then LaMnO3+SrCO3--La1-xSrxMnO3.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2002年第6期619-622,共4页
Journal of University of Science and Technology Beijing
基金
国家杰出青年科学基金资助项目 (No.50025413)
