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使用一种新的理想方法——微波辅助溶胶凝胶法,在35 min内快速制备了钙钛矿结构的La0.8Sr0.2Co0.5Fe0.5O3(LSCF)纳米材料:以8%Y2O3稳定化的ZrO2(YSZ)为电解质,La0.8Sr0.2Co0.5Fe0.5O3为阴极,铂电极为阳极,制备了LSCF/YSZ/Pt固体氧化物电池。采用X射线粉末衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)、BET和电化学阻抗谱(EIS)等技术研究了La0.8Sr0.2Co0.5Fe0.5O3材料的成相过程、粉晶结构、电极/电解质微观相貌和电池电化学性能。结果发现经过1min的微波辐射,凝胶开始分解,3 min后有钙钛矿相生成,到35 min时形成了完整的钙钛矿晶相,相应粉体的粒径和比表面积分别为22.7 nm和38.9 m2/g:在1094 K,0 mV偏置电压下电极/电解质界面电阻为0.775 Q·cm2,活化能为2.34 eV。研究发现,偏置电压越大则活化能越低。
A new and ideal method, microwave-assisted sol-gel method, was used to prepare La0.8Sr0.2Co0.5Fe0.5O3 (LSCF) nanomaterials with perovskite structure rapidly in 35 min: ZrO2 (YSZ) as electrolyte, La0.8Sr0.2Co0.5Fe0.5O3 as cathode, and platinum electrode as anode. The LSCF / YSZ / Pt solid oxide battery was prepared. The microstructures of La0.8Sr0.2Co0.5Fe0.5O3 materials were investigated by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), BET and electrochemical impedance spectroscopy (EIS) Phase formation process, powder crystal structure, electrode / electrolyte microscopic appearance and electrochemical performance of the battery. The results showed that after 1 min of microwave irradiation, the gel began to decompose and formed the perovskite phase after 3 min. At 35 min, the complete perovskite phase was formed. The particle size and specific surface area of the corresponding powders were 22.7 nm And 38.9 m2 / g: The electrode / electrolyte interface resistance was 0.775 Q · cm2 at 1094 K, 0 mV bias voltage and the activation energy was 2.34 eV. The study found that the greater the bias voltage, the lower the activation energy.