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

2020; Multidisciplinary Digital Publishing Institute; Volume: 10; Issue: 7 Linguagem: Inglês

10.3390/nano10071292

2079-4991

Xin Chen, Hui Li, Jianzhou Xu, Fadi Jaber, Farayi Musharavati, E. Zalnezhad, Sungchul Bae, Kwan San Hui, Kwun Nam Hui, Junxing Liu,

Electrochemical sensors and biosensors

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.