纳米Ce_(0.92)M_(0.08)O_(2)(M=Co,Mn,Fe,La)固溶体的制备及其氧化还原性能  

Preparation and redox performance of nanosized Ce_(0.92)M_(0.08)O_(2)(M=Co,Mn,Fe,La)solid solutions

作　　者：束俊 陆旻琳 张国芳[1] 许剑轶[1] SHU Jun;LU Minlin;ZHANG Guofang;XU Jianyi(School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《材料工程》2023年第3期138-144,共7页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51962028,52061036);内蒙古自然科学基金项目(2022LHMS05021);内蒙古自治区高等学校青年科技英才支持项目(NJYT23007)。

摘　　要：采用水热法制备Ce_(0.92)M_(0.08O_(2))(M=Co,Mn,Fe,La)固溶体,系统分析固溶体的微观结构、光谱特征及氧化还原性能。研究结果表明,Co离子掺杂样品中观察到Co_(3)O_(4)杂相,而另外三种离子均完全溶解在CeO_(2)中形成固溶体。样品为纳米尺寸,晶格常数与掺杂离子半径密切相关,样品的能隙明显降低,而且掺杂离子能够明显提高固溶体的氧空位浓度,氧空位浓度由小到大的顺序依次为:CeO_(2)<La<Fe<Co<Mn。此外,掺杂样品与H_(2)反应的还原峰温度均低于纯CeO_(2),且与H_(2)的反应量明显高于未掺杂样品。Ce_(0.92)M_(0.08O_(2))(M=La,Fe,Co,Mn)solid solutions were prepared by hydrothermal method,and the microstructure,spectral characteristics and redox properties of the solid solution were analyzed systematically.The results show that Co_(3)O_(4)is observed in Co ion doped samples,and the other three ions are completely dissolved in CeO_(2)to form solid solutions.All of samples are nanosized,and the lattice constants are related to the radius of doped ions.The band gap energies of doped samples reduce significantly,and doped ions can increase the concentration of oxygen vacancies in the solid solutions.The orders of oxygen vacancy concentration are CeO_(2)2,and the H_(2)consumption are significantly higher than that of the undoped samples.

关 键 词：CeO2固溶体 微观结构 光谱特征 氧化还原性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]