A novel binder-free electro-synthesis of hierarchical nickel sulfide nanostructures on nickel foam as a battery-type electrode for hybrid-capacitors. (15th September 2020)

• Record Type: Journal Article
• Authors: Edison, Thomas Nesakumar Jebakumar Immanuel; Atchudan, Raji; Karthik, Namachivayam; Ganesh, Karuppasamy; Xiong, Dangsheng; Lee, Yong Rok
• Is Part Of: Fuel. Volume 276(2020)
• Publication Date: 2020-09-15
• Subjects: Nickel sulfide -- Electrodeposition -- Hierarchical morphology -- Hydroxide ions -- Energy storage -- Battery-type electrode; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.118077
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Hierarchical nickel sulfide nanostructures were cathodically electrodeposited on Ni foam (NiS@Ni). NiS@Ni acts as a good positive electrode in aqueous KOH. NiS@Ni delivers maximum specific capacity of 1109C/g at a scan rate of 5 mV/s. NiS@Ni electrode can be used as a positive electrode in hybrid capacitors. Abstract: In this work, we have synthesized hierarchical nickel sulfide nanoparticles on nickel foam (NiS@Ni) via simple cathodic electrodeposition using aqueous nickel chloride (NiCl2 ) and thiourea mixtures as an electrolyte. The synthesized NiS@Ni are characterized using important surface analytical tools such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM) with energy dispersive spectrum (EDS) and elemental mapping analysis. The positive electrode performance of NiS@Ni is tested in aqueous potassium hydroxide (KOH) by common electroanalytical techniques. The cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) curves of NiS@Ni exposed clear reversible redox peaks acknowledged the Faradaic battery-type performance in aqueous KOH. Moreover, the synthesized NiS@Ni delivers maximum specific capacities of 1109C/g (308.05 mAh/g) and 532C/g (147.8 mAh/g) at a scan rate of 5 mV/s and 2 A/g of current density, respectively. Therefore, the synthesized hierarchical NiS@Ni can be applied as a battery-type positive electrode in hybrid-capacitors.