Issue 12, 2024

Ni0.5Co0.5S nano-chains: a high-performing intercalating pseudocapacitive electrode in asymmetric supercapacitor (ASC) mode for the development of large-scale energy storage devices

Abstract

Grid-scale energy storage solutions are necessary for using renewable energy sources efficiently. A supercapattery (supercapacitor + battery) has recently been introduced as a new variety of hybrid devices that engage both capacitive and faradaic charge storage processes. Nano-chain architectures of Ni0.5Co0.5S electrode materials consisting of interconnected nano-spheres are rationally constructed by tailoring the surface structure. Nano-chains of the bimetallic sulfide Ni0.5Co0.5S are presented to have a superior charge storage capacity. The Ni0.5Co0.5S nano-chain electrode presents a capacitance of 2001.6 F g−1 at 1 mV s−1, with a specific capacity of 267 mA h g−1 (1920 F g−1) at 1 A g−1 in 4 M KOH aqueous electrolyte through the galvanostatic charge–discharge (GCD) method. The reason behind the high charge storage capacity of the materials is the predominant redox-mediated diffusion-controlled pseudocapacitive mechanism coupled with surface capacitance (electrosorption), as the surface (outer) and intercalative (inner) charges stored by the Ni0.5Co0.5S electrodes are close to 46.0% and 54.0%, respectively. Additionally, a Ni0.5Co0.5S//AC two electrode full cell operating in asymmetric supercapacitor cell (ASCs) mode in 4 M KOH electrolyte exhibits an impressive energy density equivalent to 257 W h kg−1 and a power density of 0.73 kW kg−1 at a current rate of 1 A g−1.

Graphical abstract: Ni0.5Co0.5S nano-chains: a high-performing intercalating pseudocapacitive electrode in asymmetric supercapacitor (ASC) mode for the development of large-scale energy storage devices

Supplementary files

Article information

Article type
Paper
Submitted
14 Dec 2023
Accepted
09 Feb 2024
First published
12 Feb 2024
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2024,53, 5435-5452

Ni0.5Co0.5S nano-chains: a high-performing intercalating pseudocapacitive electrode in asymmetric supercapacitor (ASC) mode for the development of large-scale energy storage devices

V. Kushwaha, K. D. Mandal, A. Gupta and P. Singh, Dalton Trans., 2024, 53, 5435 DOI: 10.1039/D3DT04184K

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