中温固体氧化物燃料电池阴极材料La0.7Sr0.2Ca0.1Co1-xFexO3-δ的合成与导电性能
Synthesis and Conductivity of La0.7Sr0.2Ca0.1Co1-xFexO3-δ as A Cathode Material for IT-SOFC
摘 要
采用固相反应法合成了锶、钙与铁掺杂的稀土复合氧化物La0.7Sr0.2Ca0.1Co1-xFexO3-δ(x=0.3,0.5);通过TG-DTA分析了产物的形成过程;分别测试了产物在100～900 ℃间的混合电导率和热膨胀系数;对产物的晶体结构与晶粒形貌等进行了表征.结果表明:经1 200 ℃烧结后的两种产物均具有单一的菱方钙钛矿结构;晶粒生长情况较好,但尺寸不够均匀;混合电导率随温度升高先升后降,在600～800 ℃均大于100 S·cm-1,可满足要求,在100～500 ℃与温度基本保持线性关系,其导电行为符合小极化子导电机理;钙与铁同时掺杂有效降低其热膨胀系数,表明钙钛矿晶格的热稳定性得以提高.
阴极材料
混合电导率
钙钛矿结构
燃料电池
solid state reaction
cathode material
mixed conductivity
perovskite structure
fuel cell
Abstract
Rare earth composite oxides La0.7Sr0.2Ca0.1Co1-xFexO3-δ(x=0.3,0.5) doped with Sr,Ca and Fe were synthesized by solid state reaction.The forming process of the products was analyzed by TG-DTA testing.The mixed conductivity and thermal expansion coefficient(TEC) of the products were measured in 100-900 ℃.The crystal structure and grain morphology of the products were characterized.The results show that both the two oxides had a single rhombohedral perovskite structure,and the grain growth was good,but the size was not uniform enough after sintering at 1 200 ℃.The mixed electrical conductivity increased first and then decreased with the increase of temperature.The conductivity of the two oxides was larger than 100 S·cm-1 at 600-800 ℃ which could meet the demand.The conductivity kept linear relation with the temperature which showed that the conductive behavior accorded with the small-polaron conductive mechanism at 100-500 ℃.Ca and Fe doping at the same time could effectively reduce the TEC which indicated that the thermal-stability of the perovskite lattice increased.
中图分类号 TM911
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(10704054);天津市科技发展计划资助项目(06TXTJJC14600)
收稿日期 2009/10/26
修改稿日期 2010/7/12
网络出版日期
作者单位点击查看
备注赵捷(1958-),女,辽宁沈阳人,教授,硕士.
引用该论文: ZHAO Jie,LI Chen,MA Yong-chang,WANG Min,JIANG Yun-yao. Synthesis and Conductivity of La0.7Sr0.2Ca0.1Co1-xFexO3-δ as A Cathode Material for IT-SOFC[J]. Materials for mechancial engineering, 2010, 34(11): 68～72
赵 捷,李晨,马永昌,王敏,江云尧. 中温固体氧化物燃料电池阴极材料La0.7Sr0.2Ca0.1Co1-xFexO3-δ的合成与导电性能[J]. 机械工程材料, 2010, 34(11): 68～72
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【6】李双保,盛建军,林峰,等.钙钛矿型复合氧化物La0.8Sr0.2-Mn1-y CoyO3-δ的合成与性能研究[J].深圳职业技术学院学报,2009(1):66-70.
【7】孙福禄,高文元,隋新国,等.新型ITSOFC阴极材料Ln0.7Sr0.3-CoO3-δ合成与电性能研究[J].电池技术,2009,33(1)30-32.
【8】SRDIC V V,OMORJAN R P,SEYDEL J.Electrochemical performances of (La,Sr)CoO3 cathode for zirconia-based solid oxide fuel cells[J].Mater Sci & Eng B,2005,116:119-124.
【9】GAO Wen-yuan,SUN Jun-cai,LIU Sha,et al.Electrical properties and microwave synthesis of mixed rare earth oxide La0.7Sr0.3-x Co0.9Fen0.1O3-δ[J].Journal of Rare Earths,2006,24(9):288-292.
【10】江金国,崔崇.La1-xSrxCo0.2Fe0.8 O3-δ阴极材料的导电机理研究[J].材料科学与工艺,2007,15(4):575-578.
【11】于洪浩,高文元,孙俊才.La0.7Sr0.3-xCaxCo0.9Fe0.1O3-δ的柠檬酸盐法制备和性能[J].稀土,2005,26(4):1-5.
【12】李彦,骆仲泱,余春江,等.复合掺杂钙钛矿氧化物La0.6-Sr0.4-xCaxCo1-yNiyO3-δ阴极的制备和电性能[J].化工学报,2007,58(5):1301-1306.
【13】中国科学院半导体研究所理化分析中心研究室.半导体的检测与分析[M].北京:科学出版社,1984:433-448.
【14】刘荣辉,马文会,王华,等.固相反应合成LaSrCrMnO3-δ过程热力学分析[J].稀有金属,2007,31(1):86-91.
【15】夏正才,唐超群.La1-xSrxMnO3阴极材料的导电机理研究[J].物理学报,1999,48(8):1518-1522.
【16】于洪浩,高文元,魏莉,等.阴极材料La0.7Sr0.2Ca0.1Co1-y-FeyO3-δ的微波烧结法制备及性能[J].有色矿冶,2008,24(1):36-39.
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