High-performance flexible 1D supercapacitor using NiCo BC/MoO3 nanosheets and Fe2O3 flakes

To address the challenges posed by the fossil energy crisis and environmental pollution, extensive research and development efforts have been dedicated to exploring novel forms of energy storage devices, with a particular focus on supercapacitors. In this study, NiCo basic carbonate (BC)/MoO3 was synthesized using a hydrothermal method on copper wire (CW), resulting in the CW@NiCo BC/MoO3 electrode, which served as the positive electrode and exhibited a specific capacitance of 17.9 F cm-3 . Meanwhile, Fe2O3 nanosheets were obtained by calcining Fe wire (FW) followed by immersion in a NaBH4 aqueous solution, producing the FW@Fe2O3 negative electrode with a specific capacitance of 37.4 F cm-3 . A high-performance flexible supercapacitor with a onedimensional structure was fabricated using the CW@NiCo BC/MoO3 positive electrode and the FW@Fe2O3 negative electrode. This supercapacitor achieved a maximum energy density of 2.004 mWh cm-3 at a power density of 159.63 mW cm-3 , while demonstrating excellent durability with 80 % capacitance retention even after 6000 cycles.