Hierarchical CNT@NiCo₂O₄core–shell hybrid nanostructure for high-performance supercapacitors

Abstract

Ultrathin NiCo2O4 nanosheets directly grown on one-dimensional CNTs, as high-performance electrode materials for supercapacitors, were synthesized through a facile chemical co-deposition process combined with post-calcination in air.

NiCo2O4 nanosheets in-situ grown on three dimensional porous Ni film current collectors as integrated electrodes for high-performance supercapacitors

“…It was observed that 69.9% of the capacitance could be retained when the current density was increased 10 times, showing good rate capability of the asymmetric supercapacitor. It should be noted that the areal specific capacitance and rate performance of complete supercapacitor are not as excellent as the single 3D porous NiCo 2 O 4 /Ni electrode tested in three-electrode cell, which is similar to the previous reports [39,40]. It might be attributed to the separator and the another electrode as well as the complete supercapacitor fabrication process.…”

“…For example, NiCo 2 O 4 nanosheets, nanoneedle, wires arrays grown on Ni foam exhibit greatly improved electrochemical performance with very high capacitance and excellent cycling stability [23,25e27]. NiCo 2 O 4 nanosheets also demonstrate very good capacitive performance by coating on carbon nanotubes or carbon nanofibers [21,22].…”

High-performance aqueous rechargeable batteries based on zinc anode and NiCo2O4 cathode

“…20-0781). 4 It is worth mentioning that the pattern shows a weak crystalline state and no other peaks are observed, which effectively confirms the purity of the obtained NiCo 2 O 4 phase. Figure 2 shows CVs of the zinc metal and the obtained NiCo 2 O 4 at a scan rate of 2 mV s -1 in a mixed Li(OH)/ KOH aqueous electrolyte.…”

Mesoporous NiCo2O4 nanoneedles grown on three dimensional graphene networks as binder-free electrode for high-performance lithium-ion batteries and supercapacitors

“…In the past years, several approaches have been developed to overcome these issues. Constructing the composites of conducting additive (carbon-based materials [32][33][34], metal nanoparticles [18,35], etc.) and NiCo 2 O 4 , has been employed to achieve high-performance hybrid electrodes with high conductivity and large energy density.…”