High-performance three-dimensional nanoporous NiO film as a supercapacitor electrode

Abstract

A three-dimensional nanoporous NiO film was fabricated using a two-step process through an electrochemical route. The as-prepared NiO film exhibited a highly nanoporous structure and high surface area (264 m 2 g À1 ). The textural characterization of the film and its electrochemical performance as an electrochemical electrode were investigated. The electrode showed a high specific capacitance (1776 F g À1 ), power density (89 Wh kg À1 ), and energy density (16.5 kW kg À1 ). In addition, the electrode exhibited high and stable specific capacitance retention after a long cycle test in KOH solution. More importantly, the power density met the power requirements of the Partnership for a New Generation of Vehicles (PNGV).

Highly flexible conductive fabrics with hierarchically nanostructured amorphous nickel tungsten tetraoxide for enhanced electrochemical energy storage

“…The W species in the product have only contributed to the enhancement of electrical conductivity, but are not involved in any redox reactions [50]. Figure 5(b) shows the CV curves of amorphous NiWO 4 NSs/CF at different scan rates of 5,10,20,30,40,50, and 70 mV/s over the potential window of -0.1 to 0.6 V. As can be seen from the shape of the CV curves, the redox peaks were observed to be mirror-image symmetric against each other for all the scan rates, indicating good electrochemical reversibility of the as-prepared product [56]. As the scan rate increased, the redox peak positions were shifted slightly to the higher and lower potentials with enhanced anodic and cathodic peak current values.…”

“…On the other hand, traditional single transition metal oxides/hydroxides materials including MnO 2 [37], RuO 2 [38], Co 3 O 4 [39], NiO [40], Fe 2 O 3 [41], TiO 2 [42], Co(OH) 2 [43], and Ni(OH) 2 [21], and nanostructures (NSs) based on transition binary metal oxides/ hydroxides such as NiCo 2 O 4 [12], NiMoO 4 [44], MnCo 2 O 4 [45], Ni-Co [46], and Ni-Al layered double hydroxides [47] have been extensively explored as pseudocapacitive materials because of their multiple oxidation states capable of reversible electrochemical reactions. Cobalt tungsten tetraoxide (CoWO 4 ) and nickel tungsten tetraoxide (NiWO 4 ) are important inorganic functional materials for diverse potential applications [48][49][50].…”

One-pot synthesis of graphene/glucose/nickel oxide composite for the supercapacitor application

“…Nickel oxide appears to be a promising electrode material for supercapacitor due to high specific capacitance (1776 Fg -1 ), low cost, eco-friendly and easy availability [6]. Nickel oxide-graphene based supercapacitors, prepared by various methods such as hydrothermal, sol-gel process, and microwave [7][8][9], recently have been received a considerable attention.…”

Camphoric Carbon‐Grafted Ni/NiO Nanowire Electrodes for High‐Performance Energy‐Storage Systems

“…[1][2][3] Among them, NiO is an attractive faradaic material owing to its high specific capacitance, good capability retention, and low cost. [4][5][6] The redox performance of these metal oxides mainly depends on two factors: 1) interfacial phenomena tightly related to the morphology, and 2) conductivity.…”