Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

摘要

In this study, we synthesized binder-free NiCo O @NiCo O nanostructured materials on nickel foam (NF) by combined hydrothermal and cyclic voltammetry deposition techniques followed by calcination at 350 °C to attain high-performance supercapacitors. The hierarchical porous NiCo O @NiCo O structure, facilitating faster mass transport, exhibited good cycling stability of 83.6% after 5000 cycles and outstanding specific capacitance of 1398.73 F g at the current density of 2 A·g , signifying its potential for energy storage applications. A solid-state supercapacitor was fabricated with the NiCo O @NiCo O on NF as the positive electrode and the active carbon (AC) was deposited on NF as the negative electrode, delivering a high energy density of 46.46 Wh kg at the power density of 269.77 W kg . This outstanding performance was attributed to its layered morphological characteristics. This study explored the potential application of cyclic voltammetry depositions in preparing binder-free NiCo O @NiCo O materials with more uniform architecture for energy storage, in contrast to the traditional galvanostatic deposition methods.