中温固体氧化物燃料电池阴极材料Pr2-xSrxCoO4+δ的制备及性能研究
Preparation and Characterization of Pr2-xSrxCoO4+δ Cathode Materials for IT-SOFC
Received date: 2009-11-16
Revised date: 2009-12-23
Online published: 2010-06-10
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100 S/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0.29 Ω·cm2.
曹 悦, 顾海涛, 陈 涵, 郑益锋, 周 明, 郭露村 . 中温固体氧化物燃料电池阴极材料Pr2-xSrxCoO4+δ的制备及性能研究[J]. 无机材料学报, 2010 , 25(7) : 738 -742 . DOI: 10.3724/SP.J.1077.2010.00738
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 Pr0.08Sr1.2CoO4+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·cm2 at 700℃ in air.
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