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Exploring the charge storage mechanism in high-performance Co@MnO2-based hybrid supercapacitors using Randles–Ševčík and Dunn's models.
- Source :
- Journal of Applied Electrochemistry; Jan2024, Vol. 54 Issue 1, p65-76, 12p
- Publication Year :
- 2024
-
Abstract
- Hybrid supercapacitors are energy storage technology offering higher power and energy density as compared to capacitors and batteries. Cobalt-doped manganese oxide (Co@MnO<subscript>2</subscript>) was synthesized using an easy and affordable sol–gel process and measured the electrochemical properties. A value of the specific capacity of 1141.42 Cg<superscript>−1</superscript> was obtained which was larger in comparison to the reference sample (MnO<subscript>2</subscript> = 673.79 Cg<superscript>−1</superscript>). The value of the specific capacitance was achieved 1902 Fg<superscript>−1</superscript>. To design a hybrid supercapacitor device, Co@MnO<subscript>2</subscript> was used as the positive electrode and the activated carbon was employed as the negative electrode in two-electrode assembly. According to calculations, the measured value of the specific capacitance of Co@MnO<subscript>2</subscript> was 713.25 Fg<superscript>−1</superscript>. The charge storage mechanism is supported with the help of Randles–Ševčík and Dunn's models. The estimated value of energy and power densities were 3200 Wh kg<superscript>−1</superscript> and 24 Wkg<superscript>−1</superscript>, respectively. The stability of this device was checked by putting it to 1000 charging and discharging cycles, and it retained 86% of its initial capacity. Our result provides a platform for enhancing the functionality of energy storage systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0021891X
- Volume :
- 54
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Applied Electrochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 174644991
- Full Text :
- https://doi.org/10.1007/s10800-023-01939-3