| Texto completo | |
| Autor(es): |
Barros, Fernando Jose Soares
;
Cardozo, Klebson Lucas Pereira
;
Cruvinel, Guilherme Henrique
;
Longo, Elson
;
Garcia, Marco Aurelio Suller
;
Tanaka, Auro Atsushi
;
Pinatti, Ivo Mateus
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Materials Science; v. 59, n. 10, p. 16-pg., 2024-02-29. |
| Resumo | |
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) | |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |