武汉工程大学学报2025，Vol.47Issue(6)：621-628,8.DOI:10.19843/j.cnki.CN42-1779/TQ.202312030
锶掺杂磷灰石型硅酸镧固体电解质的电导性能
Electrical conductivity of strontium-doped apatite-type lanthanum silicate solid electrolyte
摘要
Abstract
Apatite-type lanthanum silicate solid electrolyte(La9.33Si6O26,LSO)is widely used as an electrolyte in solid oxide fuel cells due to its high ionic conductivity and excellent density.In this study,Sr-doped apatite-type lanthanum silicate solid electrolytes with the composition La9.33-xSrxSi6O26-0.5x(x=0.0,0.1,0.3,0.5,0.7,0.9)were successfully synthesized at 600℃via the urea-nitrate combustion method.The lanthanum silicate electrolytes were calcined at different temperatures(600-900℃)for 12 hours.Characterization by X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR)indicated that the optimal calcination temperature was 800℃.The influence of single Sr doping on the crystal structure,densification behavior and electrochemical performance of the electrolyte was systematically investigated using XRD,scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).Electrochemical impedance spectroscopy(EIS)measurements performed at 640℃revealed that the composition with x=0.3 exhibited the highest ionic conductivity of 1.42×10-3 S/cm.Based on these results,a conduction mechanism involving the synergistic enhancement of conductivity through oxygen ion and cation vacancies was proposed.关键词
尿素-硝酸盐燃烧法/氧离子导体/硅酸镧固体电解质/电导机理Key words
urea-nitrate combustion method/oxygen ion conductor/lanthanum silicate solid electrolyte/conduction mechanism分类
化学化工引用本文复制引用
孙建强,黄志良,商海鑫,田晓凤,王棋昌..锶掺杂磷灰石型硅酸镧固体电解质的电导性能[J].武汉工程大学学报,2025,47(6):621-628,8.基金项目
国家自然科学基金(51374155,51242010) （51374155,51242010）
湖北省科技支撑计划(2014BCB034) （2014BCB034）
武汉工程大学研究生教育创新基金(CX2022228) （CX2022228）
