Hierarchical NiCo₂O₄Nanosheets Grown on Ni Nanofoam as High-Performance Electrodes for Supercapacitors

Abstract

A high-performance electrode for supercapacitors is designed and synthesized by growing electroactive NiCo2 O4 nanosheets on conductive Ni nanofoam. Because of the structural advantages, the as-prepared Ni@NiCo2 O4 hybrid nanostructure exhibits significantly improved electrochemical performance with high capacitance, excellent rate capability, and good cycling stability.

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

“…As showed inFig. 4d, the NiCo 2 O 4 /3DGN demonstrates superior cycling stability at high charge/discharge current density with the capacitance retention of ~96.5% after 3 000 cycles, which is also superior to many reported results[30,48,[82][83][84]. Specially, the charge/discharge curves remain undistorted and essentially symmetric after 3000 cycles (InsetFig.…”

“…The capacitance values are superior to many reported results of NiCo 2 O 4 -based materials, such as NiCo 2 O 4 hollow nanosheets on Ni nanofoam (610 F g -1 at 20 A g -1 )[82]. Essentially, the achievement of high specific capacitance may be due to the mesoporous characteristics of the nanoneedles with high surface area, providing numerous electroactive sites for Faraday reaction[37].…”

NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

“…More recently, ternary nickel cobaltite (NiCo2O4) has attracted considerable research attention due to its low cost, environmental friendliness, and high theoretical capacitance [36][37][38][39][40]. By having access to contributions from both nickel and cobalt ions, ternary NiCo2O4 also exhibits higher electrochemical activity, richer redox reactions, and significantly better electrical conductivity (over two orders of magnitude greater) compared to its corresponding binary oxides NiO and Co3O4 [24,35,[41][42][43].…”

Hierarchically nanostructured transition metal oxides for supercapacitors

“…Bimetallic oxides usually offer higher electrochemical activity than single metal oxides [115][116][117]. Nickel cobaltite exhibits excellent electrochemical performance because of richer redox reaction between nickel and cobalt ions [118].…”