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以硝酸盐为原料,乙二醇为络合剂,采用溶胶凝胶法制备了质子导体SrCe0.9Y0.1O3-δ电解质薄膜。使用TG/DSC和XRD对凝胶前驱体的热分解过程及相组成进行了表征。探讨了溶胶凝胶制备SrCe0.9Y0.1O3-δ电解质的反应过程:凝胶前驱体由C3H3CeO6和Sr(NO3)2构成;Sr(NO3)2在630℃分解,并部分生成SrCO3中间相;SrCO3在865℃分解完全,并与CeO2反应最终得到SrCeO3。900℃热处理得到的SrCe0.9Y0.1O3-δ电解质薄膜致密、均匀,无气孔和微裂纹,为钙钛矿型SrCeO3相。热力学计算表明电解质凝胶前驱体生成SrCeO3的热分解反应过程能够达到的最高理论温度为1455.4℃,高于SrCeO3生成所需温度764.6℃,在热力学上有利于SrCeO3相生成。
The proton conductor SrCe0.9Y0.1O3-δ electrolyte film was prepared by sol-gel method using nitrate as raw material and ethylene glycol as complexing agent. The thermal decomposition process and phase composition of the gel precursors were characterized by TG / DSC and XRD. The reaction process of sol-gel preparation of SrCe0.9Y0.1O3-δ electrolyte was discussed: the gel precursor consisted of C3H3CeO6 and Sr (NO3) 2; Sr (NO3) 2 decomposed at 630 ℃ and partially formed SrCO3 mesophase; SrCO3 At 865 ℃ decomposition completely, and with CeO2 finally get SrCeO3.900 ℃ heat treatment SrCe0.9Y0.1O3-δ electrolyte film is dense, uniform, non-porous and micro-cracks, perovskite-type SrCeO3 phase. Thermodynamic calculations show that the highest theoretical temperature that the electrolyte gel precursor can generate during the thermal decomposition reaction of SrCeO3 is 1455.4 ℃, which is higher than that of SrCeO3, which is 764.6 ℃, which is thermodynamically favorable for the formation of SrCeO3 phase.