Abstract: B a _{0. 6} S r _{0. 4} Co _{0. 9} N b _{0. 1} O _3 --δ (BSCN) perovskitetype oxide was prepared by the solid state reaction. The high temperature chemical compatibility between BSCN0.6 and G d _{0. 1} C e _{0. 9} O _{1. 9 -5}(GDC) were analyzed by XRD. XRD patterns indicate that a week solid solution between BSCN0.6 and GDC takes place after the BSCN0.6GDC composite material was calcined at high temperature. However, this solid solution does not show a negative effect on the performance of the cathode. The mixture of BSCN0.6 and GDC in a weight ratio of 70∶30 was used as SOFC composite cathode and the electrical property, thermal expansion behavior and electrochemical performance were investigated. The electrical conductivity was found to decrease with increasing GDC content|however, the thermal expansion coefficients (TEC) of BSCN0.630%GDC composite cathode decreased, which enhances the thermal match between the cathode and GDC electrolyte. With BSCN0.630%GDC as the electrode, the polarization resistance of a symmetrical cell BSCN0.630%GDC//GDC is only 0.047～0.012 Ω•cm2 in 700～800 ℃. Therefore, BSCN0.630%GDC composite material is a promising ITSOFC cathode.

Key words: Intermediatetemperature solidoxide fuel cells, Cathode, Electrical conductivity, Thermal expansion, Polarization resistance

摘要： 通过固相反应法制备了钙钛矿氧化物B a _{0. 6} S r _{0. 4} Co _{0. 9} N b _{0. 1} O _3 --δ( 简称B S CN 0. 6) , 采用XR D对B S CN 0. 6与
G d _{0. 1} C e _{0. 9} O _{1. 9 -5}( 简称GD C) 电解质间的高温化学相容性进行表征。结果表明, B S CN 0. 6与 GD C高温煅烧后存在微
弱的固溶反应, 但并未对阴极性能造成不利影响。将 B S CN 0. 6与质量分数为3 0%的 GD C复合( 简称 B S CN 0. 6-3 0%GD C) 后作S OF C阴极, 采用四电极法测电导、 热膨胀测试等手段对复合阴极进行表征。结果表明, B S CN 0. 6与
GD C复合降低了材料的电导率, 同时也降低了材料的热膨胀系数, 提高了阴极与 GD C电解质间的热匹配性。以
B S CN 0. 6 -3 0%GD C复合材料作电极, 7 0 0~8 0 0曟时对称电池 B S CN 0. 6 - 3 0%GD C / / GD C的极化阻抗为0. 0 4 7~
0 .0 1 2Ω·c m2。因此, B S CN 0. 6 - 3 0%GD C复合材料有望作I T- S OF C的低极化阻抗的阴极材料。

关键词: 中温固体氧化物燃料电池 ,  阴极 , 电导率 ,  ,  热膨胀 , 极化阻抗