固体氧化物燃料电池电解质材料La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)的制备与性能研究  

Preparation and properties of solid oxide fuel cell electrolyte material La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)

作　　者：杨春利[1] 晁泽莹 刘璐 余文瑞 YANG Chunli;CHAO Zeying;LIU Lu;YU Wenrui(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学,材料科学与工程学院,西安710055

出　　处：《功能材料》2025年第2期2084-2090,共7页Journal of Functional Materials

基　　金：陕西省大学生创新训练项目(S202310703159)。

摘　　要：采用溶胶-凝胶法制备了质子导体固体氧化物燃料电池电解质材料La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)。Sr^(2+)掺杂后材料仍为萤石结构,且掺杂提高了材料的氧空位含量。Sr^(2+)掺杂有效降低孔隙率,提高La_(2)Ce_(2)O_(7)质子导体陶瓷样品的致密性。在湿润氢气气氛中,700℃时,La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)的电导率可达到1.2×10^(-2)S·cm^(-1)。制备了不同阴极的燃料电池,与La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)-La_(0.9)Sr_(0.1)Co_(0.2)Fe_(0.8)O_(3-δ)相比,Sm_(0.5)Sr_(0.5)CoO_(3-δ)-Ce_(0.8)Sm_(0.2)O_(2-δ)作为阴极时,各部分电阻整体降低,性能得到了提升,其单电池的峰值功率密度在700℃时可达到207 mW·cm^(-2),开路电压为0.813 V。The electrolyte material La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)for proton conducting solid oxide fuel cell was prepared by sol-gel method.After Sr^(2+)doping,the material still has the structure of fluorite,and the doping increases the content of oxygen vacancy.Sr^(2+)doping effectively reduces the porosity and improves the compactness of La_(2)Ce_(2)O_(7)proton conductor ceramic samples.The conductivity of La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)can reach 1.2×10^(-2)S/cm in a humid hydrogen atmosphere at 700℃.Compared with La_(1.95)Sr_(0.05)Ce_(2)O_(7-δ)-La_(0.9)Sr_(0.1)Co_(0.2)Fe_(0.8)O_(3-δ),when Sm_(0.5)Sr_(0.5)CoO_(3-δ)-Ce_(0.8)Sm_(0.2)O_(2-δ)is used as the cathode,the resistance of each part is reduced overall,and the performance is improved.The peak power density of the single cell can reach 207 mW/cm^(2)at 700℃,and the open circuit voltage is 0.813 V.

关 键 词：固体氧化物燃料电池 质子导体 电解质 锶掺杂 

分 类 号：TB34[一般工业技术—材料科学与工程]