【摘要】 通过固相反应法制备了Yb掺杂量分别为5%、10%和15%的SrCeO3电解质陶瓷粉体,通过Fullprof对SrCeO3电解质粉体的XRD图谱进行了全谱分析。通过电化学阻抗谱法对烧结电解质在不同气氛下的导电性能进行了表征。结果表明,600~800℃温度范围内当Yb掺杂量为10%时,经过密度修正后理想致密的SrCeO3电解质具有最高电导率,在含水氢气气氛中800℃下电解质总电导率可以达到8.2×10-3S/cm。当Yb掺杂量为15%时电解质中出现Yb3O4第二相,导致电解质总电导率有所降低。在不同气氛中电解质电导率由低到高的顺序为:干燥氩气<湿润氩气<干燥空气<干燥氢气<湿润空气≈湿润氢气。更多还原

【Abstract】 Sr Ce1- xYbxO3- α( x = 0. 05,0. 1,0. 15) solid electrolyte powders were prepared by solid-state reaction method. Rietveld refinement of X-ray diffraction( XRD) patterns was carried out by Fullprof.The conductivity of Sr Ce O3 electrolyte was measured by electrochemical workstation in different atomospheres. The results show that the electrolyte with 10% Yb has the highest conductivity at 600-800℃ in aqueous hydrogen atmosphere,which can reach 8. 2 × 10- 3S / cm at 800 ℃. Excessive Yb content might cause the formation of Yb3O4 secondary phase in the case of 15% Yb doped Sr Ce O3,which results in decreasing of the electrolyte conductivity. Total conductivity of Sr Ce O3 electrolyte in different atmospheres can be ordered as follows: σ( dry Ar) < σ( wet Ar) < σ( dry air) < σ( dry H2) < σ( wet air)≈σ( wet H2).更多还原