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Exploring the charge storage mechanism in high-performance Co@MnO2-based hybrid supercapacitors using Randles–Ševčík and Dunn’s models

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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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Authors and Affiliations

  1. Department of Physics, Riphah International University, Campus Lahore, Lahore, Pakistan

    Amir Muhammad Afzal, Nimra Muzaffar, Muhammad Waqas Iqbal & Muhammad Razaq

  2. Department of Physics and Astronomy, Sejong University, Seoul, 05006, South Korea

    Ghulam Dastgeer

  3. Department of Physics, GC University, Faisalabad, Pakistan

    Alina Manzoor & Saikh Mohammad Wabaidur

  4. Chemistry Department, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia

    Alina Manzoor & Saikh Mohammad Wabaidur

  5. Department of Electrical Engineering, College of Engineering, King Saud University, P.O. Box 800, 11421, Riyadh, Saudi Arabia

    Essam A. Al-Ammar

  6. Faculty of Engineering and Technology, Future University in Egypt, New Cairo, 11835, Egypt

    Sayed M. Eldin

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  1. Amir Muhammad Afzal
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Contributions

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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Correspondence to Amir Muhammad Afzal.

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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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