Preparation of oxygen vacancy-controllable CeO2 by electrotransformation of a CeCl3 solution and its oxidation mechanism

被引：14
作者：
Liu, Jiang [1 ,2 ]
Dou, Zhihe [1 ,2 ]
Zhang, Ting-an [1 ,2 ]
机构：
[1] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
[2] Minist Educ, Key Lab Ecol Met Multimet Intergrown Ores, Shenyang 110819, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2020年 / 46卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Electrotransformation; Atmosphere; CeO2; microstructures; Oxygen vacancies; HYDROTHERMAL SYNTHESIS; OPTICAL-PROPERTIES; MORPHOLOGY; CATALYSTS;
D O I：
10.1016/j.ceramint.2019.11.052
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
CeO2 was successfully prepared by electrotransformation of CeCl3 solution in previous work. In this work, the oxidation mechanism of Ce3+ was determined by cyclic voltammetry and a potential-pH diagram, which indicated that Ce3+ was oxidized by oxygen during the electrotransformation, and the important role of the oxygen content in solution was confirmed. Thus, the influence of atmosphere (air/argon/oxygen) on CeO2 preparation was investigated by adjusting the gas type and flow rate. XRD patterns demonstrated the cubic fluorite structure and grain size of CeO2. With an increase in the gas flow rate, the grain size decreased, but the particle size increased. This result indicated that the smaller grains contained more lattice defects and higher surface energy, so the grains preferred to agglomerate together, forming larger particles. XPS spectra proved that Ce3+ and Ce4+ both existed in the CeO2 samples. Raman scattering revealed that more oxygen vacancies could be produced with an argon atmosphere and high gas flow.
引用
收藏
页码：5976 / 5982
页数：7
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