Synthesis and characterization of cerium oxide by electrochemical methods

Abstract

Ceria‐based materials have been synthesized by electrochemical process. Electrodeposition is an interesting cheap method which can be performed at ambient pressure and rather low temperature (less than 100 °C). Moreover, it is easy to control in situ the film thickness. Ceria coatings were obtained by an indirect electrodeposition method. A potentiostatic technique (–0.7 V/SCE) was used to first reduce a hydroxide precursor (O2 or NO3–) before leading to the formation of cerium oxide after 2h of deposition time. This work focused on the characterization of ceria films deposited onto stainless steel in view of high temperature fuel cell applications. The chosen deposition conditions lead to quite adherent, homogenous and covering films. The microstructure and the crystallinity of the ceria thin layers were characterized by SEM, TEM and XRD measurements. Electrochemical microscopy (SECM) was also used to locally study the conductive properties of ceria layers and the homogeneity of the deposited films. Finally, electrochemical characterizations such as impedance spectroscopy were performed under air atmosphere. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Mixtures of room temperature ionic liquid/ethanol solutions as electrolytic media for cerium oxide thin layer electrodeposition

“…From the relaxation frequency of the high frequency contribution, a dielectric constant equal to 2 was calculated. As reported in literature, such value was characteristic of ceria, for bulk [65], even when deposited in aqueous media [28].…”

“…It could however be noticed that this activation energy was slightly higher than the one observed for sintered materials, more often close to 0.9 eV, as already observed [28]. From the relaxation frequency of the high frequency contribution, a dielectric constant equal to 2 was calculated.…”

“…Among the different techniques, such as radiofrequency magnetron sputtering [11], laser beam evaporation ion [12], chemical vapour deposition [13,14] sol-gel processing [15,16], spray pyrolysis [17], or immersion [18][19][20][21][22], that have been used to obtain cerium oxide films, electrodeposition is an attractive method. Cerium oxide films have been obtained by cathodic [23][24][25][26][27][28][29][30] or anodic [31][32][33] deposition on different substrates and in various solvents [24].…”

Superhydrophobic Copper Foam Modified with n-Dodecyl Mercaptan-CeO2 Nanosheets for Efficient Oil/Water Separation and Oil Spill Cleanup

“…Here, fabricating a properly rough CeO 2 nanostructure is the key for the superhydrophobic surface as the electrodeposition of CeO 2 involves a series of processes, such as the formation of Ce­(OH) 3 and then its conversion to CeO 2 by oxygen according to the proposed mechanism . The detailed reaction mechanism can be summarized by the following equations ,− Also, the morphology of the deposition can be controlled by the current density and electrodeposition time due to their important influence on the nucleation growth of the crystal. , Therefore, the effect of current density on the morphology was investigated first at an electrodeposition time of 20 min.…”

Biosynthesis of 3D/2D Ceo2/Mos2 Nanocomposites with Enhanced Photocatalytic Activity to Degrade Organic Dye in Wastewater and Statistical Optimization of Reaction Parameters

“…Rare earth oxides of ceria are a widely accepted photocatalyst and has been researched for a long time [31]. Cerium Oxide (CeO 2) nanoparticles can be synthesized in multiple ways, which primarily includes electrochemical [32], chemical reduction [33], microemulsion [34], microwave [35], and hydrothermal [36,37], etc. Some of these methods uses carcinogenic chemical compounds and have complex reaction conditions.…”