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Bulk synthesis of chemically activated carbon and cobalt oxide nanocomposites as supercapacitor electrodes

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Abstract

A simple and inexpensive method was presented to prepare a bulk product of chemically activated carbon (AC) and cobalt oxide (Co3O4) nanocomposites (AC/Co3O4) with different weight ratios by a solid-state reaction, which can be used as electrode materials for supercapacitor applications. The microstructure, porosity, and surface chemical properties of the prepared samples were studied in the context of their different electrochemical properties. The results showed that the electrode prepared by mixing the micrometer-sized porous structure AC with 30 wt% Co3O4 nanoparticles has a maximum specific capacitance of 435.72 F/g at a current density of 1 A/g in 6 M KOH electrolyte and excellent capacitance retention of 97.3% after 5000 galvanostatic charge/discharge cycles. In addition, the AC/Co3O4 30 wt% asymmetric supercapacitor can deliver an energy density of 4.71 Wh/kg and a power density of 487.06 W/kg at a current density of 1 A/g. Therefore, the AC/Co3O4 30 wt% nanocomposite materials represent a promising pseudocapacitive material for the next generation of electrochemical and energy storage applications.

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Acknowledgements

The authors thank the Department of Physics, Faculty of Science, Khon Kaen University for the use of their electrochemical workstation. This research project is supported by National Research Council of Thailand (NRCT): (Contact No. N41A640217). The authors declare that they have no conflicts of interest.

Funding

Funding was provided by Royal Golden Jubilee (RGJ) Ph.D. Programme, National Research Council of Thailand (NRCT): (Contact No. N41A640217).

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Mahasarakham University, Khantarawichai District, Mahasarakham, 44150, Thailand

    Nititorn Kenyota & Paveena Laokul

  2. Department of Physics, Faculty of Science, Khon Kaen University, Khonkaen, 40002, Thailand

    Wirat Jarernboon

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by NK, WJ and PL. The first draft of the manuscript was written by NK and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Paveena Laokul.

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Kenyota, N., Jarernboon, W. & Laokul, P. Bulk synthesis of chemically activated carbon and cobalt oxide nanocomposites as supercapacitor electrodes. J Mater Sci: Mater Electron 35, 158 (2024). https://doi.org/10.1007/s10854-023-11886-6

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