CAJ | 학술논문

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1 min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 Ω·cm2,活化能为2.34 eV.研究发现,偏置电压越大则活化能越低.
사용일충신적이상방법--미파보조용효응효법,재35 min내쾌속제비료개태광결구적La0.8Sr0.2Co0.5Fe0.5O3(LSCF)납미재료;이8%Y2O3은정화적ZrO2(YSZ)위전해질,La0.8Sr0.2Co0.5Fe0.5O3위음겁,박전겁위양겁,제비료LSCF/YSZ/Pt고체양화물전지.채용X사선분말연사(XRD)、부리협홍외광보(FT-IR)、소묘전자현미경(SEM)、BET화전화학조항보(EIS)등기술연구료La0.8Sr0.2Co0.5Fe0.5O3재료적성상과정、분정결구、전겁/전해질미관상모화전지전화학성능.결과발현경과1 min적미파복사,응효개시분해,3 min후유개태광상생성,도35 min시형성료완정적개태광정상,상응분체적립경화비표면적분별위22.7 nm화38.9 m2/g;재1094 K,0 mV편치전압하전겁/전해질계면전조위0.775 Ω·cm2,활화능위2.34 eV.연구발현,편치전압월대칙활화능월저.
Perovskite structured La0.8Sr0.2Co0.5Fe0.5O3(LSCF)cathode materials were prepared by a microwave assisted sol-gel process.The formation and crystalline structure of powders derived from the chelate solution were analyzed by X-Ray diffraction(XRD),Fourier transformation infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and BET techniques.In addition,the electrochemical performances of LSCF cathode for zirconia-based solid oxide fuel cells were investigated by Electrochemical Impedance Spectroscopy(EIS)on a three electrode cell,where the sample in this study was the LSCF working electrode and two platinum electrode used as counter and reference electrode.The results show that the gel began to decomposed after about 1 min microwave treatment,then transformed into a great quantity of LSCF and a pure LSCF Perovskite single phase when microwave treated for 3 min and 35 min respectively.Typical mean particle diameters and measured at 1094 K without a DC bias.The LSCF/YSZ interracial resistance activation energies is 2.34 eV.The DC bias has a great effect on the interfacial resistance activation energies,as larger DC bias gives rise to lower activation energies.