中温固体氧化物燃料电池Sr_(1-x)Tb_xCoO_(3-δ)(x≤0.3)阴极材料的制备与性能研究  

Preparation and Characterization of Sr_(1-x)Tb_xCoO_(3-δ)(x≤0.3) Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cell

作　　者：刘涛[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《无机材料学报》2013年第2期212-216,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(50904016);中央高校基本科研业务费专项基金(N110402011)~~

摘　　要：以化学计量比的 SrCO3, Co3O4和 Tb4O7为原料, 采用固相法合成了中温固体氧化物燃料电池阴极材料Sr1-xTbxCoO3-δ（STC, x ≤0.3）, 采用 XRD、ND、TGA、范德堡直流四探针法和交流阻抗谱技术对 STC 的晶体结构、高温失重、电导率和电化学性能进行了研究. 结果表明： Sr0.9Tb0.1CoO3-δ的晶体结构是立方相 Pm-3m 空间群结构;Sr0.8Tb0.2CoO3-δ和Sr0.7Tb0.3CoO3-δ是四方相I4/mmm结构. 随着Tb含量的增加, STC中的氧含量增加. 在500~800℃时, STC 的总电导率（σ）均大于 407 S/cm. 极化电阻（Rb）和活化能（Ea）随着 x 的增加而增加. 当 x=0.1 时, STC 的氧离子空位浓度最大, 具有最好的阴极性能, 由其组成的单电池最大功率密度为 836 mW/cm^2.Abstract： Cathode materials consisting of Sr1-xTbxCoO3-δ（x≤0.3） were prepared by solid-state reaction from stoichiometric proportions of SrCO3, Co304 and Tb407. Crystal structure, weight loss processes, electronic conductivity, polarization resistance and cell performance were investigated by XRD, ND, TGA, Van Der Pauw DC four-probe method and electrochemical method, respectively. XRD shows the presence of two structural phases in the series belonging to Pm-3m for Sr0.9Tb0ACoO3-δ and I4/mmm for Sr0.8Tb0.2CoO3-δ and Sr0.7Tb0.3CoO3-δ. Electronic conductivity measurements show that the conductivities of STC were all higher than 407 S/cm in the temperature range of 500℃ to 800℃. AC impedance measurements in symmetrical cells with LSGM as an electrolyte show that the polarization resistance （Rp） and the activation energy （Ea） increase with increasing Tb content. Sr0.9Tb0.1CoO3-δ, with the largest concentration of oxygen vacancies exhibits the best cathode characteristics with maximum power density of 836 mW/cm^2.

关 键 词：固体氧化物燃料电池 阴极 钴基钙钛矿 极化电阻 

分 类 号：O614[理学—无机化学]