【作者】 陈磊； 周德凤；

【Author】 Lei Chen;Defeng Zhou;School of Chemistry and Life Science,Changchun University of Technology;

【机构】 长春工业大学化学与生命科学学院；

【摘要】 采用溶胶-凝胶法制备La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-δ（LSGM）、Ce_0.8Nd_0.2O_1.9（NDC）和Ce_0.8Nd_0.2O_1.9-1mol%Co（NDC-Co）电解质,在NDC和NDC-Co的溶胶中均加入5%（w,质量分数）的LSGM预烧粉体制得NDC-LSGM和NDC-Co-LSGM复合电解质。采用X-射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）和X-能量色散谱仪（EDS）对样品进行结构表征,交流（AC）阻抗谱测试样品导电性能。结果表明:CoO的添加可促进NDC的晶粒生长,提高致密性,增加电解质的晶界导电性;CoO主要位于晶界处,具有助烧结的作用;NDC-Co与LSGM复合因在三相晶界处产生杂质相,使晶界电导率略降低。更多还原

【Abstract】 Ce_0.8Nd_0.2O_1.9（NDC） and La_0.8Sr_0.2Ga_0.8Mg_0.2O_<sub>3-δ（LSGM） electrolytes were synthesized via a sol-gel method.NDC-LSGM and NDC-Co-LSGM composite electrolytes were then prepared by adding 5%（w,mass fraction） precalcined LSGM powders to NDC and NDC-Co sols.The microstructure and phase composition of the pellets were characterized using X-ray diffraction（XRD）,field-emission scanning electron microscopy（FE-SEM）,and energy dispersive X-ray spectroscopy（EDS）.The electrical conductivities of the pellets were measured using alternative current（AC）impedance spectroscopy.The results showed CoO additive significantly promote grain growth and improve the grain boundary conductivity of the electrolyte;CoO mainly was located in the grain boundaries region,played the role of a sintering aid role.However,the slightly decrease of the grain boundary conductivities(10.9×10^-2 S·m^-1) for the NDC-Co-LSGM electrolyte can be attributed to presence of trace amount of impurities phase in the grain boundaries.更多还原