过渡金属离子对Ce_(0.8)Sm_(0.2)O_(1.9)电解质离子导电性的影响

Effect of Transition Metals on the Ionic Conductivity of Doped Ce_(0.8)Sm_(0.2)O_(1.9) Electrolytes

本文研究了掺杂过渡金属离子(Ni^(2+)、Cu^(2+)、V^(5+)、Mn^(2+))对Ce_(0.8)Sm_(0.2)O_(1.9)(SDC)材料离子导电性的影响。用电化学阻抗谱、SEM、XEDS等检测手段对样品的离子导电性、显微结构和微区元素进行了检测分析,并对影响机理进行了探讨。结果表明:掺杂过渡金属离子对SDC电解质材料的离子电导率有不同程度的影响,且主要是对晶界离子电导率产生较为显著的影响。Ni、Cu对SDC晶界离子电导率的提高相对较为显著,从而导致其对宏观离子电导率的提高也较为显著;其它过渡金属离子和铝离子对SDC电解质晶界离子电导率提高作用相对较小,故而对其宏观离子电导率的提高作用也较小。

Effect of transition metals(Ni2+,Cu2+,V5+,Mn2+)on the ionic conductivity of SDC materials was investigated.The ionic conductivity,microstructure and micro area of the samples were examined by electrochemical impedance spectroscopy(EIS),SEM and XEDS.The results indicated that transition metals could markedly affect the ionic conductivity of SDC materials by impacting the grain boundary conductivity.Especially Ni2+and Cu2+ions improved relatively significantly the grain boundary conductivity,which also resulted in the increase of the total ionic conductivity.The improvements to SDC grain boundary conductivity by other transition metal ions and aluminum ion were relatively small and,as a result,the improvement to the total ionic conductivity is not remarkable.