Co掺杂对Ce_(0.85)Y_(0.15)O_(2-δ)固体电解质材料性能的影响

Effect of Co-doping on properties of Ce_(0.85)Y_(0.15)O_(2-δ) solid electrolyte materials

采用固相反应法合成并在不同温度下烧结Ce0.85Y0.15-xCoxO2-δ(x=0、0.01、0.03和0.05)固体电解质材料,着重研究Co掺杂量对试样的体积密度和离子电导率的影响.采用X射线衍射(XRD)分析烧结后试样的晶体结构,Archimedes法测定烧结试样密度,电化学阻抗谱测量试样的离子电导率.结果表明:试样Ce0.85Y0.15-xCoxO2-δ(x=0、0.01、0.03和0.05)1 400℃烧结后均呈单一的立方萤石结构相,掺杂Co可以有效提高试样的体积密度,促进试样烧结.此外,一定量的Co还可以增加试样的离子电导率,相同烧结条件下试样Ce0.85Y0.14Co0.01O2-δ呈现出最高的离子电导率,1 450℃烧结,其离子电导率在800℃时达到0.083 1 s/cm.

Ce0.85Y0.15O2-δ （x = 0,0. 01,0. 03, and 0. 05 ） solid electrolyte materials were synthesized by solid state reaction method and sintered at different temperatures. The effect of Co-dopant amount on volume densities and ionic conductivities was investigated. After sintering, crystal structures of the samples were analyzed by X-ray diffraction （XRD） , volume densities were measured using Archimedes method and ionic conductivities were tested by electrochemical impedance spectroscopy. Results showed that Ce0.85Y0.15O2-δ （x = 0,0.01,0.03, and 0. 05 ） sintered at 1 400 ℃ exhibited single cubic fluorite structure phase, the doping of Co effectively increased the volume densities and promoted the sintering process. Furthermore, the doping could also increase ionic conductivities. Under the same sintering conditions, Ce0.85Y0.15O2-δsintered at 1 450 ℃ achieved the highest ionic conductivity of 0. 083 1 s/cm at 800 ℃.