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Hierarchical Manganese-Doped Nickel–Cobalt Oxide Electrodes with Graphene for Use as High-Energy-Density Supercapacitors
Journal article   Open access   Peer reviewed

Hierarchical Manganese-Doped Nickel–Cobalt Oxide Electrodes with Graphene for Use as High-Energy-Density Supercapacitors

Kuan-Ching Lee, Guan-Ting Pan, Thomas Chung-Kuang Yang, Po-Cheng Shen, Kuan Lun Pan, Timm Joyce Tiong, Aleksandar N. Nikoloski and Chao-Ming Huang
Surfaces (Basel), Vol.8(3), 43
2025
DOI: https://doi.org/10.3390/surfaces8030043
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Published11.04 MBDownloadView
CC BY V4.0,  Open Access

Abstract

supercapacitor nickel-cobalt oxide graphene electrochemical deposition binder-free
Thin films of manganese–nickel–cobalt oxide with graphene (G@MNCO) were deposited on copper foam using electrochemical deposition. NiCo2O4 is the main phase in these films. As the proportion of graphene in the precursor solution increases, the oxygen vacancies in the samples also increase. The microstructure of these samples evolves into hierarchical vertical flake structures. Cyclic voltammetry measurements conducted within the potential range of 0–1.2 V reveal that the electrode with the highest graphene content achieves the highest specific capacitance, approximately 475 F/g. Furthermore, it exhibits excellent cycling durability, maintaining 95.0% of its initial capacitance after 10,000 cycles. The superior electrochemical performance of the graphene-enhanced, manganese-doped nickel–cobalt oxide electrode is attributed to the synergistic contributions of the hierarchical G@MNCO structure, the three-dimensional Cu foam current collector, and the binder-free fabrication process. These features promote quicker electrolyte ion diffusion into the electrode material and ensure robust adhesion of the active materials to the current collector.

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