Synthesis of Gadolinium-Doped Ceria Powders by Electrolysis of Aqueous Solutions

摘要

A gadolinium-doped ceria powder was produced by electrolysis of an aqueous solution containing Ce~(3+) and Gd~(3+) ions using direct and alternating current at 4-10 V of applied voltage between two platinum wire electrodes (anode and cathode). The powders produced were identified as a gadolinium-doped ceria solid solution by X-ray diffraction and chemical analysis. Large porous particles 60-70 urn in size were produced under a direct current field for 15 min. On the other hand, nanoparticles 40-250 nm in size were produced for 6-12 h of electrolysis using alternating current below 20 Hz of frequency. No particles were formed in the high frequency range from 100 Hz to 1 MHz. The nucleation and growth rates of the particles depended on the frequency of the alternating current and electrolysis time applied. The Gd_2O_3/CeO_2 ratio of the particles formed with alternating current was lower than that of the starting solution.