NiCo₂S₄nanosheet-decorated 3D, porous Ni film@Ni wire electrode materials for all solid-state asymmetric supercapacitor applications

Abstract

Wire type supercapacitors with high energy and power densities have generated considerable interest in wearable applications. Herein, we report a novel NiCoS-decorated 3D, porous Ni film@Ni wire electrode for high performance supercapacitor application. In this work, a facile method is introduced to fabricate a 3D, porous Ni film deposited on a Ni wire as a flexible electrode, followed by decoration with NiCoS as an electroactive material. The fabricated NiCoS-decorated 3D, porous Ni film@Ni wire electrode displays a superior performance with an areal and volumetric capacitance of 1.228 F cm and 199.74 F cm, respectively, at a current density of 0.2 mA cm with a maximum volumetric energy and power density (E: 6.935 mW h cm; P: 1.019 W cm). Finally, the solid state asymmetric wire type supercapacitor is fabricated using the fabricated NiCoS-decorated 3D, porous Ni film@Ni wire as a positive electrode and N-doped reduced graphene oxide (N-rGO) as a negative electrode and this exhibits good areal and volumetric capacitances of C: 0.12 F cm and C: 19.57 F cm with a higher rate capability (92%). This asymmetric wire type supercapacitor demonstrates a low leakage current and self-discharge with a maximum volumetric energy (E: 5.33 mW h cm) and power (P: 855.69 mW cm) density.

NiCo2S4 Nanotrees Directly Grown on the Nickel NP-Doped Reduced Graphene Oxides for Efficient Supercapacitors

“…As the scan rate increased, the CV area also increased by retaining its shape, and the peak current density increased with increasing scan rates suggesting rapid Faradaic reaction. Also, the anodic and cathodic peaks were shifted towards positive and negative potential sides, due to the polarization of the electrode at higher scan rates [19,20,21]. Figure 5c exhibits the GCD results of the NiCo 2 S 4 /Ni-rGO with Faradaic reaction type performance and with a distinct plateau in the charging and discharging process.…”

Review on Nanoarchitectured Current Collectors for Pseudocapacitors

“…and binary alloy (e.g., CuZn, CuAu, PtAu, CuPd, CuAg, AuPd, etc.) systems . Figure b displays the typical scanning electron microscopy (SEM) images of nanoporous Au network prepared from DHBT method, depicting the rough surface with numerous diverse pores and dendritic tree structures .…”

Bioinspired sea-sponge nanostructure design of Ni/Ni(HCO3)2-on-C for a supercapacitor with a superior anti-fading capacity

“…27,28 The nickel oxygenated chemicals, based on redox reaction mechanisms of Ni(II)/Ni(III) in an alkaline electrolyte, show high values of theoretical capacity, and thus are recently emerged as promising candidates for electrode nanomaterials of pseudocapacitance. [29][30][31] Among nickel oxygenated chemicals, Ni(HCO 3 ) 2 could provide a relatively higher specific capacity and a better stability according to literature. [32][33][34][35] Therefore, carbon-Ni(HCO 3 ) 2 nanocomposites, combining the advantages of conductive porous carbon supporters and high capacity of Ni(HCO 3 ) 2 , could attain both high energy density and power density in the supercapacitor.…”