摘要
研究碳酸铈在500, 700和900℃H2中分解形成的CeO2-x氧空位特征,并对比考察了碳酸铈在700℃空气和N2中的分解过程,结果显示:随着温度的升高,分解获得的CeO2-x颗粒尺寸增加且表面有"烧结"现象出现;另外在H2中制备的CeO2-x氧空位浓度随着温度的增加而增加,相同分解温度下, H2中分解获得的CeO2-x的氧空位浓度较在空气和N2中制备的样品高。不同温度H2条件下制备的CeO2-x样品的紫外-可见光吸收光谱表明,随氧空位浓度的增加CeO2-x的响应光谱发生红移。
The oxygen vacancies characterization of CeO2-x synthesized by the cerium carbonate decomposing at 500, 700 and 900 ℃ in hydrogen atmosphere was studied, while the decomposition of cerium carbonate at 700 ℃ in air and nitrogen was also investigated. Results showed that with the temperature rising, the particles size of CeO2-x was increasing and the surface of ceria was fusion. The oxygen vacancies concentration of CeO2-x increased with the temperature elevating in H2 atmosphere. At the same decomposition temperature, the CeO2-x obtained in hydrogen had a larger oxygen vacancies concentration than that of CeO2-x produced in nitrogen and air. The UV-visible absorption results indicated that the absorption peak had a red shift with oxygen vacancies concentration increasing.
作者
洪华华
兰苑培
刘涛
顾小英
章子熊
田翔宇
姜浪钊
Hong Huahua;Lan Yuanpei;Liu Tao;Gu Xiaoyin;Zhang Zixiong;Tian Xiangyu;Jiang Langzhao(College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China;Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang550025, China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2019年第3期320-326,I0003,共8页
Journal of the Chinese Society of Rare Earths
基金
黔科合平台人才([2017]5788,贵大人基合字(2017)04号,贵大SRT字(2017)020)资助
