High‐Performance Aqueous Asymmetric Supercapacitors Based on Microwave‐Synthesized Self‐Supported NiCo₂O₄ Nanograss and Carbide‐Derived Carbon

Abstract

A binder‐free supercapacitor electrode of NiCo2O4 nanograss coated on nickel foam (NF) was prepared by single‐mode microwave method along with calcination, displaying a higher specific capacitance (1042 F/g at 1 mV/s). Furthermore, we demonstrate excellent electrochemical performance of NiCo2O4 nanograss as anode electrode and carbide‐derived carbon as cathode electrode. The resultant asymmetric supercapacitors possess high specific capacitance (105.6 F/g at 1 mV/s), good cycling stability (retention capacitance of 78.5% after 5000 cycles), high energy density (32.9 Wh/kg) and large power density (970.1 W/kg), which has potential application in energy storage devices.

Hierarchical Architectured Dahlia Flower-Like NiCo2O4/NiCoSe2 as a Bifunctional Electrode for High-Energy Supercapacitor and Methanol Fuel Cell Application

“…The hybrid NCO/NCS//O-AC device stands out with an impressive specific energy of 54.4 Wh kg –1 at a specific power of 350 W kg –1 illustrated in a Ragone plot in Figure (e). The device shows a high rate capability by maintaining 40.8 Wh kg –1 even at a high specific power of 5654 W kg –1 compared to other reported NiCo 2 O 4 -based works (listed in Table ): NiCo 2 O 4 on gelatin biomass carbon (GNC)//AC, NiCo 2 O 4 nanoneedles/NF//AC, NiCo 2 O 4 /FeSe 2 , NiCoSe 2 //AC, NiCoSe 2 nanosheets//AC, NiCo 2 O 4 //carbide-derived carbon (CDC), and NiCo 2 S 4 /NiCo 2 O 4 core–shell . Further, to determine its long-term cyclic life, charge–discharge curves were measured over 10,000 cycles as shown in Figure (f).…”

“…The device shows a high rate capability by maintaining 40. 29 and NiCo 2 S 4 /NiCo 2 O 4 core−shell. 30 Further, to determine its long-term cyclic life, charge−discharge curves were measured over 10,000 cycles as shown in Figure 5(f).…”

“…(iii) The hierarchical 1D/2D NCO/NCS core–shell nanostructures directly grown on NF avoid “dead volume” created by the use of binder/additives and provide high interfacial contact . (iv) The core 1D NCO nanograsses decorated with 2D crumpled NCS nanosheets and formation of 3D microflower-like morphologies possess large surface areas which provide enormous electroactive sites for insertion/extraction of OH – ions contributing to superior capacitive behavior . (v) The synergistic effect between NCO and NCS provides rapid charge transfer kinetics with shorter diffusion paths and enhances electronic conductivity.…”

Dual Functionality of Dichalcogenide-Supported Pentagon Core–Hexagon Ring-Structured NiCo2O4 Nanoplates: An Effective Hybridization for Tuning of a Diffused- to a Surface-Controlled Process and Boosting of CO2 Electrocatalysis

“…−1 . The E and P values of the NiCo 2 O 4 /MoSe 2 //AC device are superior to those of different ASC devices reported previously based on NiCo 2 O 4 and its composites such as NiCo 2 O 4 //AC (24.5 W h kg −1 and 175 W kg −1 ),60 NiCo 2 O 4 /carbon cloth//porous graphene paper [(32.9 W h kg −1 and 970.1 W kg −1 ),61 NiCo 2 O 4 /NiCoSe/ nickel foam (NF)//AC (54.5 W h kg −1 and 350 W kg −1 ),62 NiCo 2 O 4 //AC cocoa-700 (47.7 W h kg −1 and 430 W kg −1 ),63 Ni x Co 3−x O 4 /NF//AC (39.3 W h kg −1 and 800.2 W kg −1 ),9 …”

Nickel Cobaltite: A Positive Electrode Material for Hybrid Supercapacitors

“…Carbide‐derived carbons (CDCs) are beneficial in improving electrochemical performance due to their high surface area and electrical conductivity [44] . Zhang et al [45] . developed NiCo 2 O 4 nanograss on Ni foam synthesized by single‐mode microwave method.…”