论文部分内容阅读
采用EDTA-柠檬酸法合成了中温固体氧化物燃料电池阴极材料Sr_(1.5)La_(0.5)Mn_(1-x)Co_xO_4(SLMCOx),并利用粉末X射线衍射(XRD)、X射线光电子能谱(XPS)以及电化学交流阻抗谱(EIS)进行表征。结果表明,该材料与Ce0.9Gd0.1O1.95(CGO)在1 200℃烧结12 h不发生化学反应。随着Co掺入量的增加,氧化物中Mn~(3+)和Co~(2+)含量增多,晶格氧含量降低,晶格畸变率增大。交流阻抗谱(EIS)测试结果显示,钴的掺杂明显降低电极的极化电阻,其中Sr_(1.5)La_(0.5)Mn_(0.7)Co_(0.3)O_4阴极在700℃空气中的极化电阻为0.62Ω·cm~2,明显小于Sr_(1.5)La_(0.5)MnO_4阴极在750℃的极化电阻(1.5Ω·cm~2),表明钴掺杂的Sr_(1.5)La_(0.5)Mn_(1-x)CoxO_4是一种潜在的IT-SOFC阴极材料。
The Sr_ (1.5) La_ (0.5) Mn_ (1-x) Co_xO_4 (SLMCOx) cathode material was synthesized by EDTA-citric acid method. The powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The results show that the material does not react with Ce0.9Gd0.1O1.95 (CGO) at 1200 ℃ for 12 h. With the increase of the content of Co, the content of Mn 3+ and Co 2 + in the oxide increases, the lattice oxygen content decreases and the lattice distortion rate increases. The results of AC impedance spectroscopy (EIS) showed that the doping of cobalt significantly reduced the polarization resistance of the electrode. The polarization resistance of Sr 1.5 La 0.5 Mn 0.7 Co 0.3 O 4 cathode in air at 700 ℃ (1.5) · cm ~ 2, which is obviously lower than the polarization resistance (1.5Ω · cm ~ 2) of Sr_ (1.5) La_ (0.5) MnO_4 cathode at 750 ℃, indicating that the cobalt doped Sr 1.5 La 0.5 Mn_ (1-x) CoxO_4 is a potential IT-SOFC cathode material.