采用直流电解合成法, 分别以CeCl3, Ce(NO3)3, CeCl3-KI溶液为电解液单室制备了纳米CeO2粉体. 经高温焙烧后, TEM和XRD测试表明: 粒子基本呈球形, 所得产物均为立方晶系CeO2, 粒径分别为20～50nm, 30～50nm, 20～100nm. 同时, 使用阴离子交换膜的双室电解法电解CeCl3溶液, 发现得到的CeO2粒径(7～20nm)比单室电解得到的小, 分析了造成粒径不同的原因. 本工作还对各溶液体系电解形成CeO2的机理进行了分析.
CeCl3, Ce(NO3)3 and CeCl3-KI solutions were respectively electrolyzed at a constant current density in a single chamber cell or a double chamber cell, consequently, CeO2 powders were produced. After they were calcined at high temperature, the size and structure of ceria were analyzed by means of TEM and XRD. The reasons of size difference of CeO2 powders prepared in the single chamber cell or the double chamber cell were analyzed. The CeO2 synthesis mechanisms of electrolizing all the cerium (Ⅲ)-salt solution systems were also discussed in details. The results show that the nanometer scale powders are cubic crystal group in structure and spherical in shape, and the sizes of samples prepared in the single chamber cell are 20-50nm, 30-50nm and 20-100nm, respectively. The size (7-20nm) of CeO2 powders prepared by electrolizing CeCl3 solution in the double chamber cell with an anion-exchange membrane is smaller than that prepared in the single chamber cell.
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