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- Title
Chemical synthesis and electrochemical performance of Hausmannite Mn<sub>3</sub>O<sub>4</sub>/rGO composites for supercapacitor applications.
- Authors
Cuéllar-Herrera, Lorena; Miriam Arce-Estrada, Elsa; Esperanza Pacheco-Catalán, Daniella; Vivas, Leonardo; Ortiz-Landeros, José; Jiménez-Lugos, Cancio; Romero-Serrano, Antonio
- Abstract
A simple approach for the preparation of hausmannite Mn3O4/rGO composites for supercapacitor electrodes is reported. The individual Mn3O4 and rGO phases were synthesized by dry ball milling and the modified Hummers method, respectively. Subsequently, composites with different Mn3O4/rGO ratios were prepared by ultrasonic treatment. The physicochemical and electrochemical properties were characterized. In addition, the electrochemical performance of an electrode supercapacitor was tested in two different configurations: a three-electrode cell and a symmetric supercapacitor (SSC). The three-electrode cell showed an excellent specific capacitance of 525 F·g-1 at 5 mV·s-1. To investigate practical applications, Mn3O4/rGO were used as electrodes to construct symmetric supercapacitors. The composite with a volume ratio of Mn3O4:rGO of 7:3 showed a remarkable stability of 85 % after 5000 charge-discharge cycles. This SSC also delivered an energy density of 6.25 W·h·kg 1 at a power density of 125 W·h·kg 1 with a current density of 0.5 A·g 1, and 5.36 W·h·kg 1 at a power density of 500 W·h·kg 1 and 2 A·g 1.
- Subjects
CHEMICAL synthesis; MANGANESE oxides; ELECTROCHEMISTRY; SUPERCAPACITOR electrodes; ENERGY density
- Publication
International Journal of Electrochemical Science, 2024, Vol 19, Issue 9, p1
- ISSN
1452-3981
- Publication type
Article
- DOI
10.1016/j.ijoes.2024.100737