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

Author(s)

Barros, Fernando Jose Soares ; Cardozo, Klebson Lucas Pereira ; Cruvinel, Guilherme Henrique ; Longo, Elson ; Garcia, Marco Aurelio Suller ; Tanaka, Auro Atsushi ; Pinatti, Ivo Mateus

• Document type: Journal article
• Source: Journal of Materials Science; v. 59, n. 10, p. 16-pg., 2024-02-29.

Abstract

Herein, we investigated CeVO4 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 CeVO4 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 Ce3+, Ce4+, and V5+ 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. (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC