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新型固体电解质Ce_6-xSm_xMoO_15-δ（0≤x≤1.2）的合成及电性质

Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce_6-xSm_xMoO_15-δ（0≤x≤1.2）

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【Author】 ZHOU De-Feng~(1),BO Qi-Bing~(2),WANG Qiu-Yan~(3),WANG Jing-Ping~(1),L Min-Feng~(1),LIU Jian-Fen~(1),CAO Xue-Qiang~(1),XING Xian-Ran~4,MENG Jian~(1*) (1.Key Laboratory of Rare Earth Chemistry and Physics,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;2.College of Chemistry and Chemical Engineering,Jinan University,Jinan 250000,China;3.Department of Chemistry,Changchun College of Chinese Medicine,Changchun 130000,China;4.Department of Physical Chemistry,Beijing University of Science & Technology,Beijing 100083,China)

【机构】中国科学院长春应用化学研究所稀土化学与物理重点实验室；济南大学化学化工学院；长春中医学院化学系；北京科技大学物理化学系；中国科学院长春应用化学研究所稀土化学与物理重点实验室长春130022；济南250000；长春130000；长春130022；北京100083；长春130022；

【摘要】采用溶胶-凝胶方法合成系列新型氧化物Ce6-xSmxMoO15-δ(0≤x≤1.2).通过TG-DTA,XRD和XPS等手段对氧化物结构进行了表征.结果表明,氧化物的最低成相温度为400℃,具有立方莹石结构.Sm的掺杂可增加氧离子空位浓度,改善母体电导率.阻抗谱表明,采用溶胶-凝胶法合成固体电解质可减少或消除其晶界电阻.800℃时,Ce5.2Sm0.8MoO15-δ的电导率高达6.67×10-3S/cm.更多还原

【Abstract】 A new solid electrolyte series of oxides Ce_6-xSm_xMoO_15-δ（0≤x≤1.2） were synthesized by sol-gel method.The precursors and the resultant oxide powders were characterized by differential thermal analysis/thermogravimetry（DTA/TG）,X-ray Diffraction（XRD） and X-ray Photoelectron Spectroscopy（XPS）.The formation temperature of the compounds was found to be as low as 400 ℃.Ce_6-xSm_xMoO_15-δ crystallized to fluorite-related cubic structure.The electrical conductivity of samples was investigated by using AC impedance spectroscopy.Impedance spectra analyses show that the grain-boundary resistance of the solid electrolyte prepared by sol-gel method wad reduced or even eliminated.It shows that the presence of Sm is related with the oxygen-ion conductivity.The highest oxygen-ion conductivity is found in Ce_6-xSm_xMoO_15-δ（x=0.8） reaching 6.67×10^-3 S/cm at 800 ℃. The Ce_6-xSm_xMoO_15-δionic conductor shows a potential application in the intermediate-temperature solid oxide fuel cells（SOFCs）.更多还原