Chemical synthesis and properties of La_(1.9)Ba_(0.1)Mo_(1.9)Mn_(0.1)O_9 as electrolyte for IT-SOFCs  

作　　者：田长安 尹奇异 谢劲松 阳杰 孙虹 季必发 鲍魏涛 

机构地区：[1]Department of Chemistry and Materials Engineering, Hefei University

出　　处：《Journal of Rare Earths》2014年第5期423-428,共6页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China(51102073);Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province(AE201361);Natural Science Foundation of Education Department of Anhui Province(KJ2012B154,KJ2013B229,KJ2012ZD15);Natural Science Foundation of Anhui Province of China(10040606Q53,1308085QB35);the College Students'Innovation and Entrepreneurship Training Program of China(201311059056,201311059044,201311059055,201311059044)

摘　　要：The highly phase-pure electrolyte materials with compositionLa1.9Ba0.1MO1.9Mn0.1O9（LBMMO） was prepared by the sol-gel auto-combustion method for intermediate-temperature solid oxide fuel cells （IT-SOFCs）. The details ofgel＇s auto-combustion, phase evolution, sintering, thermal expansion and electrochemical performance of LBMMO were investigated by means of thermo-gravimetry （TG）, X-ray diffxaction （XRD）, scanning electron microscopy （SEM）, transmission electron spectroscopy （TEM）, thermal expansion curve （TEC） and complex impedance spectra. The results showed that the highly phase-pure electrolyte LBMMO could be obtained after calcining at 600 ℃. The sample sintered at 900 ℃ for 4 h in air exhibited a better sinterability, and the relative density of LBMMO was higher than 96%. The electrical conductivities of the sample were 6.7x 10-3 and 25.9× 10-3 S/cm at 700 and 800 ℃ in air, respectively. Results also showed that LBMMO had moderate thermal expansion （a=16.3×10-6 K-l, between room temperature and 800 ℃） and an electrical activation energy equal to 1.32 eV）.The highly phase-pure electrolyte materials with compositionLa1.9Ba0.1MO1.9Mn0.1O9（LBMMO） was prepared by the sol-gel auto-combustion method for intermediate-temperature solid oxide fuel cells （IT-SOFCs）. The details ofgel＇s auto-combustion, phase evolution, sintering, thermal expansion and electrochemical performance of LBMMO were investigated by means of thermo-gravimetry （TG）, X-ray diffxaction （XRD）, scanning electron microscopy （SEM）, transmission electron spectroscopy （TEM）, thermal expansion curve （TEC） and complex impedance spectra. The results showed that the highly phase-pure electrolyte LBMMO could be obtained after calcining at 600 ℃. The sample sintered at 900 ℃ for 4 h in air exhibited a better sinterability, and the relative density of LBMMO was higher than 96%. The electrical conductivities of the sample were 6.7x 10-3 and 25.9× 10-3 S/cm at 700 and 800 ℃ in air, respectively. Results also showed that LBMMO had moderate thermal expansion （a=16.3×10-6 K-l, between room temperature and 800 ℃） and an electrical activation energy equal to 1.32 eV）.

关 键 词：ELECTROLYTE electrical conductivity La2M0209 SOL-GEL rare earths 

分 类 号：TM911.4[电气工程—电力电子与电力传动]