中温固体氧化物燃料阴极La_(0.7)Sr_(0.3-x)Ca_xCo_(0.9)Fe_(0.1)O_(3-δ)粉体的柠檬酸盐法合成及性能  

Preparation and properties of powders of La_(0.7)Sr_(0.3-x)Ca_xCo_(0.9)Fe_(0.1)O_(3-δ) using a citrate method for intermediate temperature solid oxide fuel cells

作　　者：高文元[1] 孙俊才[1] 刘莎[1] 李长敏[2] 唐乃岭[2] 

机构地区：[1]大连海事大学材料工艺研究所,辽宁大连116026 [2]大连轻工业学院材料科学与工程系,辽宁大连116034

出　　处：《现代化工》2006年第z2期219-222,共4页Modern Chemical Industry

基　　金：国家"863"计划项目(2001AA515080);瑞典亚洲合作计划项目(DNR6964);辽宁省教育厅高等学校科学研究项目(05L073);辽宁省自然科学基金项目(20062145)

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。The precursor of La_(0.7)Sr_(0.3-x)Ca_xCo_(0.9)Fe_(0.1)O_(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 Ca^(2+),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_(0.8)Sm_(0.2)O_2.

关 键 词：柠檬酸盐法 La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ 电导率 化学相容性 催化作用 

分 类 号：TM911.4[电气工程—电力电子与电力传动]