摘要
采用固相反应法合成中温固体氧化物燃料电池的LaBaCoFeO_(5+δ)阴极粉末,研究不同煅烧温度对晶体结构的影响。将等量的LaBaCoFeO_(5+δ)和Ce_(0. 8)Sm_(0. 2)O_(1. 9)电解质粉末通过机械混合和煅烧制备成LaBaCoFeO_(5+δ)-Ce_(0. 8)Sm_(0. 2)O_(1. 9)复合阴极粉末。研究了复合阴极粉末的化学相容性、粒度分布、热膨胀和电化学性能。结果表明,LaBaCoFeO_(5+δ)固相反应的最佳温度为1200℃,LaBaCoFeO_(5+δ)和Ce_(0. 8)Sm_(0. 2)O_(1. 9)之间没有发生明显的反应,复合阴极粉末的中位径D_(50)为2. 441μm。LaBaCoFeO_(5+δ)-Ce_(0. 8)Sm_(0. 2)O_(1. 9)复合阴极比LaBaCoFeO_(5+δ)阴极组成的单电池在800℃的极化电阻下降了约48. 7%,而最大输出功率密度提高了约82. 5%,表现出更好的电化学性能。
LaBaCoFeO5+δ cathode powder was synthesized by conventional solid-state reaction for intermediate-temperature solid oxide fuel cell. The effect of sintering temperature on the crystal structure was investigated. To prepare the LaBaCoFeO5+δ-Ce0.8Sm0.2O1.9 composite cathode powder, equal amount of LaBaCoFeO5+δ and Ce0.8Sm0.2O1.9 electrolyte powder was mechanical mixed and calcined. The chemical compatibility, particle size distribution, thermal expansion and electrochemical performance of composite cathode were investigated. Experimental results show that the optimal temperature of solid-state reaction for LaBaCoFeO5+δ is about 1200 ℃, no serious reaction occurred between LaBaCoFeO5+δ and Ce0.8Sm0.2O1.9 , and its medium diameter D 50 is about 2.441 μm. Compared to LaBaCoFeO5+δ cathode, the polarization resistance of single cell with LaBaCoFeO5+δ-Ce0.8Sm0.2O1.9 composite cathode at 800 ℃ had an approximate decrease of 48.7%, while the maximum power density increased by 82.5%, showing the better electrochemical performance.
作者
李瑞锋
王文娟
刘诚
黄康
李纯
鲁自鼎
LI Rui-feng;WANG Wen-juan;LIU Cheng;HUANG Kang;LI Chun;LU Zi-ding(Key Laboratory of Inorganic Functional Materials,School of Chemistry and Chemical Engineering,Huangshan University,Huangshan 245041,China;Postdoctoral Scientific Research Workstation (Postdoctoral Programme),Huangshan Benma Group Co.,Ltd.,Huangshan 245900,China;Modern Educational Technology Center,Huangshan University,Huangshan 245041,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第4期1012-1017,共6页
Bulletin of the Chinese Ceramic Society
基金
安徽省教育厅自然科学研究重点项目(KJ2018A0405)
黄山学院自然科学研究项目(2015xkjq007
2015xkjq007I)
关键词
中温固体氧化物燃料电池
复合阴极
晶体结构
电化学性能
intermediate-temperature solid oxide fuel cell
composite cathode
crystal structure
electrochemical performance
