中温固体氧化物燃料电池阴极材料Pr_(2-x)Sr_xCoO_(4+δ)的制备及性能研究  

Preparation and Characterization of Pr_(2-x)Sr_xCoO_(4+δ) Cathode Materials for IT-SOFC

作　　者：曹悦[1] 顾海涛[1] 陈涵[1] 郑益锋[1] 周明[1] 郭露村[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《无机材料学报》2010年第7期738-742,共5页Journal of Inorganic Materials

摘　　要：采用固相反应法合成了中温固体氧化物燃料电池阴极材料Pr2-xSrxCoO4+δ(x=0.8,1.0,1.2).通过XRD、SEM、热膨胀法、直流四探针法、交流阻抗谱法和循环伏安法对该体系材料的晶体结构、热膨胀系数、电导率和电化学性能进行了研究.结果表明,合成的粉体均形成了单相K2NiF4结构,Pr0.8Sr1.2CoO4+δ与电解质材料Sm0.2Ce0.8O1.9(SDC)在1100℃空气气氛下混合烧结,未生成杂相.材料的热膨胀系数随着Sr含量的增加而升高.800℃时样品的电导率均大于100S/cm.随着Sr含量的增加,极化电阻减小,Pr0.8Sr1.2CoO4+δ在空气中的极化电阻最小,700℃为0.29Ω·cm2。The samples of Pr2-xSrxCoO4＋δ（x=0.8,1.0,1.2） as cathode material for intermediate-temperature solid oxide fuel cell（IT-SOFC） were synthesized by solid-state reaction.Crystal structure,thermal expansion,electrical conductivity and electrochemical properties were investigated by XRD,SEM,dilatometry,DC four-probe method,AC impedance and cyclic voltammetry（CV） techniques,respectively.The XRD results showed all the samples obtained as a single K2NiF4-structural phase,there were no chemical reaction occurred between the Pr0.8Sr1.2CoO4＋δ electrode and the Sm0.2Ce0.8O1.9（SDC） electrolyte at 1100℃ in air.The thermal expansion coefficients（TECs） increased with Sr content increasing.The electrical conductivity of the specimens was over 100S/cm at 800℃.The polarization resistance decreased with the increasing of Sr content.Pr0.8Sr1.2O4＋δ had the optimum value of 0.29Ω·cm^2 at 700℃ in air.

关 键 词：固体氧化物燃料电池 阴极 热膨胀系数 电导率 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]