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采用溶胶-凝胶法制备了固体氧化物燃料电池(SOFCs)电解质材料Ce_(0.8)Y_(0.2-x)Sr_xO_(2-δ)(x=0.00、0.02、0.04、0.06、0.08),并通过红外光谱、热重-差示扫描量热分析、X射线衍射、扫描电镜、交流阻抗等对试样进行分析表征。结果表明,采用溶胶-凝胶法经700℃煅烧所得粉体呈现单相立方萤石结构,平均晶粒尺寸在8 nm~19 nm之间;溶胶-凝胶法制备的Ce_(0.8)Y_(0.2-x)Sr_xO_(2-δ)具有较高的烧结活性,经1400℃烧结2 h后材料的相对密度均大于98%。电化学性能研究显示,Y、Sr双掺杂能提高CeO_2基电解质的电性能,其中Ce_(0.8)Y_(0.16)Sr_(0.04)O_(1.88)在中温条件下具有良好的离子导电率、适中的电导活化能。Ce_(0.8)Y_(0.16)Sr_(0.04)O_(1.8)在800℃时的离子电导率为0.039 S/cm,电导活化能为0.86 eV。
Solid oxide fuel cells (SOFCs) electrolyte Ce_ (0.8) Y_ (0.2-x) Sr_xO_2 (δ = 0.00,0.02,0.04,0.06,0.08) were prepared by sol- Infrared spectroscopy, thermogravimetric-differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, AC impedance analysis of the sample characterization. The results show that the powders obtained by sol-gel method calcined at 700 ℃ have the single-phase cubic fluorite structure and the average grain size is between 8 nm and 19 nm. The Ce_ (0.8) Y_ 0.2-x) Sr_xO_ (2-δ) has high sintering activity, and the relative density of the materials after sintering at 1400 ℃ for 2 h is more than 98%. The electrochemical performance studies show that Y, Sr doping can improve the electrical properties of CeO_2 based electrolytes. Ce_ (0.8) Y_ (0.16) Sr_ (0.04) O_ (1.88) has good ionic conductivity at moderate temperature, The conductance activation energy. The ionic conductivity of Ce_ (0.8) Y_ (0.16) Sr_ (0.04) O_ (1.8) at 800 ℃ is 0.039 S / cm and the conductance activation energy is 0.86 eV.