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

• Published in: Nanomaterials (Basel, Switzerland) Switzerland), 2020-06, Vol.10 (7), p.1292
• Main Authors: Chen, Xin, Li, Hui, Xu, Jianzhou, Jaber, F., Musharavati, F., Zalnezhad, Erfan, Bae, S., Hui, K.S., Hui, K.N., Liu, Junxing
• Format: Article
• Language: English
• Subjects: Activated carbon; Annealing; Arrays; Capacitance; Carbon; Cobalt; Deposition; electrodeposition; Electrodes; Electrolytes; Energy; Energy storage; Flux density; Mass transport; Metal foams; nanostructure; Nanostructured materials; Nickel; Nickel compounds; NiCo2O4; Nitrates; Physical characteristics; Scanning electron microscopy; Spectrum analysis; Structural hierarchy; Supercapacitors; Voltammetry
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano10071292

In this study, we synthesized binder-free NiCo2O4@NiCo2O4 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 NiCo2O4@NiCo2O4 structure, facilitating faster mass transport, exhibited good cycling stability of 83.6% after 5000 cycles and outstanding specific capacitance of 1398.73 F g−1 at the current density of 2 A·g−1, signifying its potential for energy storage applications. A solid-state supercapacitor was fabricated with the NiCo2O4@NiCo2O4 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−1 at the power density of 269.77 W kg−1. This outstanding performance was attributed to its layered morphological characteristics. This study explored the potential application of cyclic voltammetry depositions in preparing binder-free NiCo2O4@NiCo2O4 materials with more uniform architecture for energy storage, in contrast to the traditional galvanostatic deposition methods.