SILAR deposited nickel sulphide-nickel hydroxide nanocomposite for high performance asymmetric supercapacitor. (1st October 2020)

• Record Type: Journal Article
• Authors: Nath, Anish R.; Sandhyarani, N.
• Is Part Of: Electrochimica acta. Volume 356(2020)
• Publication Date: 2020-10-01
• Subjects: SILAR -- Asymmetrical supercapacitor -- Pseudocapacitor -- Nickel sulphide -- Nickel hydroxide -- Electrochemical energy storage; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136844
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A successive ionic layer adsorption and reaction (SILAR) method at room temperature to fabricate supercapacitor electrodes. Excludes the necessity of binders for the electrode preparation. The electrochemical performance can be controlled by tuning the ratio of nickel sulphide and nickel hydroxide. The ASC delivered a maximum energy and power density of 51 Wh/kg and 18 kW/kg, respectively. Abstract: A successive ionic layer adsorption and reaction (SILAR) method at room temperature is used to fabricate nickel sulphide-nickel hydroxide composite (NSH) layers on nickel foam electrode for asymmetrical supercapacitor applications. Electrode preparation by this method excludes the use of a binder, which normally dampers the electrochemical behaviour due to its inherent insulating property. The composite coated nickel foam (NF) substrate delivers a specific capacity of 108 C/g at 3 A/g in a three-electrode system. Electrodes show good stability even at a high current density of 50 A/g in a potential window of 0.65 V. The co-existence of nickel sulphide and nickel hydroxide in the composite contributes to the excellent electrochemical behaviour. An asymmetrical supercapacitor (ASC) device NSH// KOH// MAC is constructed with NSH as the positive electrode, modified activated carbon (MAC) as the negative electrode, and KOH soaked Whatman filter paper as the separator. The ASC delivers a maximum energy and power density of 51 Wh/kg and 18 kW/kg, respectively. Graphical Abstract: A binder-free SILAR technique was used to fabricate nickel hydroxide- nickel sulphide composite coated nickel foam electrode for supercapacitor application. Image, graphical abstract