Sweet potato‑derived carbon nanosheets incorporate NiCo2O4 nanocomposite as electrode materials for supercapacitors

Since a composite electrode made of carbon and transition metal oxides has much potential to be the best electrode type for a future energy storage system, the low-temperature solution growth method was used to make a carbon framework from sweet potato with NiCo₂O₄ nanoparticles attached to it. This method is easy, cheap, and can be used for large-scale commercial production. FTIR spectra a peak band of Ni-O and Co-O and the bending functional group at wave number 857 cm⁻¹. XRD shows the crystal planes (1 1 1), (2 2 0), (3 3 1), (2 2 2), (4 0 0), (4 2 2), (5 1 1), and (4 4 0) at 2θ = 18.97°, 31.97°, 37.51°, 38.10°, 44.55°, 55.51°, 58.65°, and 64.92°, which indicates the NiCo₂O₄. The typical broad peaks around 23.3° can be linked to (0 0 2) lattice planes of amorphous carbon. The average size of the grains in the NiCo₂O₄/C samples was found to be 21.5 ± 0.5 nm. VSM shows that NiCo₂O₄/C has strong magnet properties. Based on the CV curve formed, it can be seen that NiCo₂O₄/C-2.8 has a balanced cathodic and anodic curve and also a higher current density than the others. It shows that NiCo₂O₄/C-2.8 has a higher ability to move electrons. The addition of the number of variations in the carbon mixture in NiCo₂O₄ shows the specific capacitance. It shows that carbon can prevent the movement of electrons in NiCo₂O₄, causing a decrease in performance. The right amount of carbon can increase the electron transfer ability.