Abstract
Nowadays, there is constant demand for the development of energy storage materials using advanced methodologies. In this scenario, a large-scale environmentally friendly synthesis was chosen to prepare Ni–Co-layered double hydroxide (LDH)-incorporated reduced graphene oxide (rGO) composites for asymmetric supercapacitors. The electrode sample was tested XRD, FESEM, Raman, BET, and XPS in order to study the detailed physic-chemical properties. The rGO was incorporated in the two-dimensional (2D) nanosheets, which not only serve as the spacer to increase the surface area, but also enhance the conductivity of the nanocomposite. The obtained architecture was employed as an advanced electrode in a supercapacitor. Thanks to the synergistic effect of conductive graphene and NiCo- LDH, the nanocomposites delivered a capacitance of 1975 Fg−1 at 1 Ag−1 and decent rate performance (capacitance retention of 87.9% at 20 Ag−1); while NiCo-LDH could only exhibited a capacitance of 720 Fg−1 at 1 Ag−1 and 78.5% of the capacitance remained at 10 Ag−1. The asymmetric supercapacitors assembled with NiCo-LDH@rGO and activated carbon (AC) delivered high energy density and power density, up to 55.76 Whkg−1 and 987.5 Wkg−1, respectively. The appealing electrochemical performance indicates its huge application potential in supercapacitors. Interestingly, the NiCo-LDH@rGO//AC ASC devices connected in series were able to light up a red LED indicator after being fully charged. The results demonstrate that the NiCo-LDH@rGO//AC ASC has a promising potential in commercial application.
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The data that support the findings of this study are available from the corresponding author, upon reasonable request.
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K. Vanasundari and P. Sureka, participated in the study conceptualization and writing of (original draft) the manuscript. G. Mahalakshmi participated in the data curation, formal analysis, and writing (review & editing) of the manuscript.
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Vanasundari, K., Sureka, P. & Mahalakshmi, G. Fabrication of porous Ni–Co LDH@rGO nanocomposites as efficient electrode materials for asymmetric supercapacitor. J Mater Sci: Mater Electron 35, 1083 (2024). https://doi.org/10.1007/s10854-024-12781-4
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DOI: https://doi.org/10.1007/s10854-024-12781-4