利用硝酸盐溶液一次浸渗工艺在La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF)表面涂覆Sm0.2Ce0.8O2(SDC)纳米颗粒,制备了LSCF-SDC纳米结构复合阴极.微观结构分析显示SDC纳米颗粒在LSCF表面均匀分布并且颗粒大小均一.界面阻抗图谱表明SDC浸渗极大的降低了LSCF阴极的界面极化阻抗,在750和650℃仅为0.074,0.44 Ω·cm2.LSCF-SDC复合阴极的表观活化能为1.42 eV,略小于纯LSCF阴极.与混合法制备的LSCF-GDC复合电极相比,采用浸渗工艺制备的LSCF-SDC纳米结构复合阴极也显示出良好的电化学催化活性.%Porous La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF) cathodes were coated with a thin film of Sm0.2Ce0.8O1.95-δ(SDC) using a one-step infiltration process. The SDC infiltrated LSCF cathodes were characterized by electronic microscope and impedance spectra. Examination of the microstructures reveals that well-distributed SDC nanoparticles are formed on the surface of LSCF grains with a relatively narrow size distribution. Impedance analysis indicates that the SDC infiltration has dramatically reduced the polarization of LSCF cathode, reaching the interfacial resistances of 0.074, and 0.44 fi-cm2 at 750 and 650℃, respectively. The activation energy of SDC infiltrated LSCF cathodes is 1.42 eV, which is a little lower than the blank LSCF cathodes. The SDC infiltrated LSCF cathodes also shown an electrocatalytic activity comparable to or better than that of LSCF-GDC composite cathodes.
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