【摘要】 以金属硝酸盐为原料,柠檬酸盐法合成了用于中温固体氧化物燃料电池阴极材料La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ(LSC-CF,x=0.05、0.10、0.15、0.20)的前驱体,TG-DSC、XRD和SEM研究了LSCCF的形成过程、晶体结构、粉体形貌、催化性能以及与电解质的化学相容性,并在空气气氛下用直流四极探针法测试经1 200℃烧结3 h后LSCCF样品从100℃到800℃的电导率。实验结果表明:800℃处理3 h后的LSCCF前驱体可以形成粒度小于20μm钙钛矿结构的粉体,LSCCF样品的电导率随着Ca2+含量的减少而变大,且在500~800℃内均大于500 S/cm。LSCCF粉料可使碳粉的着火点降低14℃并加剧了碳粉的反应。LSCCF阴极与电解质Ce0.8Sm0.2O2具有好的化学相容性。更多还原

【Abstract】 The precursor of La_0.7Sr_0.3-xCa_xCo_0.9Fe_0.1O_3-δ（LSCCF,x=0.05,0.10,0.15,0.20） as the cathode materials for intermediate temperature solid oxide fuel cell were synthesized by a citrate method using metal nitrate as the start materials in the work.The formation process,crystal structure,powder morphology,catalysis performance and chemical compatible with the electrolyte were investigated with TG-DSC,XRD and SEM.The experimental results showed that the precursor calcined at 800℃ for 3 h could form a perovskite phase powders with particle diameter distribution less than 20 μm.The electrical conductivity of all samples sintered at 1 200℃ for 3 h measured by four-probe DC method in air from 100℃ to 800℃ increases with decreasing the content of Ca²⁺,and the minimum of the electrical conductivity of LSCCF by a citrate method was 500 S/cm from 500℃ to 800℃.The LSCCF powders,slowed down 14℃ for the fire point of carbon powder as catalyst and are good chemical compatible with the electrolyte Ce_0.8Sm_0.2O₂.更多还原