摘要
采用溶胶–凝胶燃烧法和机械混合法制备CeO2-BaCeO3、Ce0.8Gd0.2O1.9(GDC)-BaCeO3、CeO2-BaCe0.8Y0.2O3-δ(BCY)及GDC-BCY复合粉末,复合粉末中两相的摩尔比为1∶1,并在1550℃保温烧结5h。研究掺杂元素对掺杂CeO2与掺杂BaCeO3固相反应的影响,并研究了固相反应后GDC-BCY复合电解质的电化学性能。结果表明:掺杂元素能够抑制BaO的挥发,促使GDC-BCY复合电解质发生固相反应,形成以BaCe1-x-yGdxYyO3-α相为主的显微组织,其电导率大于单相BCY,略小于单相GDC。GDC-BCY电解质的单电池在700℃时的最大功率密度为0.657W/cm2,均高于相同条件下BCY、GDC电解质的单电池性能。
CeO2-BaCeO3, Ce0.8Gd0.2O1.9 (GDC)-BaCeO3, CeO2-BaCe0.8Y0.2O3–δ(BCY) and GDC-BCY composite powders (in a molar ratio 1:1) were prepared via a sol-gel combustion method and a mechanically-mixing method. The effect of doping elements on the solid-state reaction between doped CeO2 and doped BaCeO3 at a sintering temperature of 1 550℃ was investigated. The electrochemical properties of GDC-BCY composite electrolyte were investigated. The results show that the doping of elements into CeO2-BaCeO3 suppresses the evaporation of BaO, and promotes the solid-state reaction between GDC and BCY. The GDC-BCY composite electrolyte sintered at 1 550℃ produces a perovskite phase of BaCe1–x–yGdxYyO3–α. The conductivity of the GDC-BCY pellet after solid-state reaction is much greater than that of the single phase BCY, and slightly smaller than that of the single phase GDC. The single cell with GDC-BCY composite electrolyte has a peak power density of 0.657 W/cm2 at 700℃, which is greater than that of the cells with the GDC or BCY electrolyte.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第2期189-194,共6页
Journal of The Chinese Ceramic Society
关键词
中温固体氧化物燃料电池
复合电解质
固相反应
掺杂二氧化铈
掺杂铈酸钡
intermediate-temperature solid oxide fuel cells
composite electrolyte
solid-state reaction
doped ceria
doped barium cerate