Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)-Ag复合阴极材料的性能研究  

Study on Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)-Ag composite cathode materials

作　　者：朱文霞[1] 吕喆[2] 王乐新[1] 高丽敏[3] 

机构地区：[1]黑龙江八一农垦大学理学院,黑龙江大庆163319 [2]哈尔滨工业大学,黑龙江哈尔滨150001 [3]黑龙江科技学院,黑龙江哈尔滨150022

出　　处：《电源技术》2013年第8期1332-1335,共4页Chinese Journal of Power Sources

基　　金：黑龙江省骨干教师资助项目(1153G023)

摘　　要：为发展中温固体氧化物燃料电池(IT-SOFC)的阴极材料,用柠檬酸络合法合成了Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)粉体,并在BSCF中加入一定量的金属Ag作为SOFC的阴极材料。X-ray衍射方法研究了复合阴极Ba0.5Sr0.5Co0.8Fe0.2O3-δ-x Ag(BSCF-x Ag,x=0%～30%质量分数)系列样品的成相情况,结果表明Ba0.5Sr0.5Co0.8Fe0.2-O3-δ(BSCF)和Ag二者在烧结过程中没有发生反应。高温电阻测试表明复合阴极材料(BSCF-x Ag)比纯BSCF材料具有较高的电导率,BSCF-10%Ag的最大电导率在430℃达到24.3 S/cm,而BSCF的最大电导率在450℃,为19.1 S/cm。同时用交流阻抗法研究了BSCF-xAg复合阴极材料的性能,实验结果表明:Ag的参杂量为20%时,阴极极化电阻最小,在650℃BSCF的极化电阻为0.465Ω·cm2,而BSCF-20%Ag的电阻仅为0.099Ω·cm2,约为BSCF的1/5。这标志着参杂Ag的BSCF作为中低温固体氧化物燃料电池的阴极材料是非常具有发展前景的。In order to develop a cathode for IT-SOFC, Ba0.5 Sr0.5 Co0.8 Fe0.2 O3-δ（BSCF） powders were prepared by an EDTA-Pechini method with some Ag as the cathode materials of SOFC. Ba0.5 Sr0.5 Co0.8 Fe0.2 O3-5-x Ag （BSCF-x Ag, x=-0-30%） were studied for applications in IT-SOFCs. The XRD results suggest that no chemical reactions between BSCF and Ag in the composite cathode were found. The resistance measurements show that the addition of Ag into BSCF improves electrical conductivity of pure BSCF, and the improved conductivity results in attractive cathode performance. The composite materials exhibit higher conductivity than that of pure BSCF. In addition, electrochemical impedance spectra exhibit the better performance of BSCF-Ag composite cathodes than pure BSCF. The results of the polarization resistance indicate that the optimum content of Ag in the composite cathodes is about 20%, e.g., the polarization resistance value of BSCF-20%Ag was only 0.099 Ω.cm2 at 650 ℃, about one-fifth of that BSCF at 650 ℃. As a summary, compared to a pure BSCF cathode, it is found that adding Ag in the cathode enhances the BSCF performance significantly.

关 键 词：固体氧化物燃料电池 复合阴极 BSCF-Ag X射线衍射 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]