Ni Foam Substrates Modified with a ZnCo₂O₄ Nanowire-Coated Ni(OH)₂ Nanosheet Electrode for Hybrid Capacitors and Electrocatalysts

Abstract

For the construction of high-performance energy storage and conversion devices, the development of advanced electrode materials with specific nanostructural characteristics is a requirement of the moment. Several types of ZnCo 2 O 4 @Ni(OH) 2 nanoarchitectures are prepared in this study using a simple two-step hydrothermal strategy. At 1 A g −1 , the observed capacitance of the ZnCo 2 O 4 @Ni(OH) 2 -2.0 sample-based hybrid capacitor was 848.6 C g −1 . The fabricated capacitor device exhibited not only high energy density but also an excellent cycling stability. As an electrocatalyst, the same sample, that is, ZnCo 2 O 4 @Ni(OH) 2 -2.0, demonstrates 280.2 mV over potential at 50 mA cm −2 . This research shows that the provided electrode material is well suited for future capacitor and electrocatalyst applications.

High-Energy Asymmetric Supercapacitor Based on the Nickel Cobalt Oxide (NiCo2O4) Nanostructure Material and Activated Carbon Derived from Cocoa Pods

“…At elevated scan rates, the diffusion process of the ions is observed to be predominant, while the capacitive process prevails at low scan rates. From the CV profiles in Figure a, the current ( I ) dependence with respect to the scan rate ( v ) can be evident for the two processes in line with the following equations: − …”

Co3O4@NiMoO4 composite electrode materials for flexible hybrid capacitors

“…The shortage of fossil energy resources leads to urgent requirement for the exploration of sustainable energy conversion and storage equipment [1][2][3]. Among them, the supercapacitor (SC) is an excellent energy storage device due to high power density and long cycle life [4,5]. According to energy storage mechanism, SCs can be classified into electrical double-layer capacitors and pseudo-capacitors.…”

Transition metal sulfide/hydroxide electrode materials with high specific capacities

“…16 In addition, nickel hydroxide is also widely used in supercapacitors because of its high theoretical capacitance and unique layer structure. [17][18][19] Sharif's group prepared Co(OH) 2 @Ni(OH) 2 nanosheets on 3D-Ni film-coated nickel wires by an electrochemical route. It delivers a specific capacitance of 355.2 C g -1 at 1 A g -1 and 80.0% capacitance retention after 3000 cycles.…”