M. Stojmenović, N. Nisic, M. Zunic, F. Basoli, Jelena Gulicovki, I. Ristovic, M. Kragović
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引用次数: 1
摘要
Ce0.8Nd0.0025Sm0.0025Gd0.005Dy0.095Y0.095O2-?采用改良甘氨酸-硝酸盐法(MGNP)和室温自传播反应(SPRT)制备了透视固体离子导体(CNSGDY)。两种粉末的压小球在1550℃下烧结。在空气环境中温度升高2小时。采用XRPD、拉曼光谱、FESEM、EDS和EIS等方法对烧结样品进行了表征。尽管烧结温度较高，但样品的XRPD和FESEM分析证实了适当尺寸的萤石结构晶粒。通过能谱分析确定了烧结过程后CeO2结构中引入掺杂剂的总浓度(x = 0.2)。烧结后，拉曼光谱证实了氧化铈晶格中氧空位的保留，这与固体离子导体离子电导率的提高是一致的。烧结MGNP样品的总电导率在700℃时达到最高值。C (4.22 ?10？2 S cm?1)，对应的活化能为0.26 eV。
Development of a new system of solid ionic conductors based on multi-doped ceria for application in IT-SOFCs
Nanosized multi-doped ceria with composition Ce0.8Nd0.0025Sm0.0025Gd0.005Dy0.095Y0.095O2-? (CNSGDY) as perspective solid ionic conductor was obtained by modified glycine-nitrate procedure (MGNP) and room temperature self-propagating reaction (SPRT). The pressed pellets of both powders were sintered at 1550?C for 2 h in an air atmosphere. The obtained sintered samples were characterized by XRPD, Raman spectroscopy, FESEM, EDS and EIS methods. Despite a high temperature of sintering, XRPD and FESEM analyses of the samples confirmed appropriate dimensions of grains with fluorite structure. Overall concentration of introduced dopants (x = 0.2) in the structure of CeO2 after the sintering process was confirmed by EDS analysis. After sintering, Raman spectroscopy confirmed retention of the oxygen vacancies in the ceria lattice, which is in accordance with the improvement of ionic conductivity of solid ionic conductors. The highest value of total conductivity was obtained for the sintered MGNP sample at 700?C (4.22 ? 10?2 S cm?1), with the corresponding activation energy of 0.26 eV.
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