Microwave-assisted hydrothermal synthesis of CeVO4 nanostructures: exploring their applicability in supercapacitor technologies

• Published in: Journal of materials science 2024-03, Vol.59 (10), p.4236-4251
• Main Authors: Barros, Fernando José Soares, Cardozo, Klebson Lucas Pereira, Cruvinel, Guilherme Henrique, Longo, Elson, Garcia, Marco Aurélio Suller, Tanaka, Auro Atsushi, Pinatti, Ivo Mateus
• Format: Article
• Language: English
• Subjects: Activated carbon; Cerium compounds; Characterization and Evaluation of Materials; Chemical composition; Chemical synthesis; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Electrochemical analysis; Electrons; Energy Materials; Energy storage; High resolution electron microscopy; Materials Science; Nanostructure; Oxidation; Polymer Sciences; Solid Mechanics; Storage systems; Supercapacitors; X ray photoelectron spectroscopy
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-024-09487-7

Herein, we investigated CeVO 4 nanostructures synthesized using a microwave-assisted hydrothermal method, focusing on their structural and electrochemical properties for potential supercapacitor applications. Notably, the selected synthesis method yielded a material that displays lattice spacing consistent with the (200) plane of the tetragonal CeVO 4 structure, as confirmed by high-resolution transmission electron microscopy and corroborated by X-ray diffraction analysis. In addition, EDX spectroscopy demonstrated the high purity of the sample, with only Ce, V, and O elements presented, and XPS analysis revealed the chemical composition of the elements and oxidation states on the surface, with Ce 3+ , Ce 4+ , and V 5+ identified. Following, cyclic voltammetry tests indicated pseudocapacitive behavior with well-defined redox peaks and good capacitive behavior and stability; then, galvanostatic charge–discharge profiles exhibited high specific capacitances at various current densities. After such analyses, an asymmetric supercapacitor was assembled using activated carbon as a cathode, and it demonstrated an excellent energy density value of 424.43 Wh kg −1 at a power density of 2783.11 W kg −1 (1 A g −1 in 2.0 M KOH). Thus, the comprehensive structural and electrochemical characterizations provided valuable insights into the material’s potential for energy storage systems. Graphical abstract