Abstract
Hybrid supercapacitors are energy storage technology offering higher power and energy density as compared to capacitors and batteries. Cobalt-doped manganese oxide (Co@MnO2) 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−1 was obtained which was larger in comparison to the reference sample (MnO2 = 673.79 Cg−1). The value of the specific capacitance was achieved 1902 Fg−1. To design a hybrid supercapacitor device, Co@MnO2 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@MnO2 was 713.25 Fg−1. 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−1 and 24 Wkg−1, 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.
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Acknowledgements
The work was supported by Researchers Supporting Project number (RSP2023R492), King Saud University, Riyadh, Saudi Arabia.
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AMA, MR, and NM worked on the experiment, data collection, analysis, interpretation of results, and writing the manuscript. MWI, GD, S.M, EAA, AM, and SME helped with the calculation process, performed the experiments, and reviewed the manuscript.
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Afzal, A.M., Muzaffar, N., Iqbal, M.W. et al. Exploring the charge storage mechanism in high-performance Co@MnO2-based hybrid supercapacitors using Randles–Ševčík and Dunn’s models. J Appl Electrochem 54, 65–76 (2024). https://doi.org/10.1007/s10800-023-01939-3
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DOI: https://doi.org/10.1007/s10800-023-01939-3