Electrochemical studies on crystalline CuS as an electrode material for non-aqueous Na-ion capacitors. (23rd March 2020)

• Record Type: Journal Article
• Authors: Goswami, Manoj; Nithya, Chandrasekaran; Sathish, N.; Kumar, Satendra; Singh, Netrapal; Srivastava, A. K.; Kumar, Surender
• Is Part Of: New journal of chemistry. Volume 44:Number 14(2020)
• Page Start: 5278
• Page End: 5284
• Publication Date: 2020-03-23
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c9nj06465f
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Current investigations are concentrated on the investigations of copper sulphide (CuS) for sodium-ion capacitors (NICs). Abstract : Current investigations are concentrated on the development of high-performance electrode materials for sodium-ion capacitors (NICs). Copper sulphide can be employed as an electrode material for sodium-ion capacitors owing to its electrical conductivity and specific capacity. Crystalline CuS provides a large surface area for Na insertion/extraction. In this context, we have reported CuS powder synthesised via a simple wet chemical route. XRD and FT-IR studies have been carried out to determine the phase formation and confirm the purity of the CuS powder. A specific surface area of 62 m 2 g −1 is measured by a BET surface area analyser. NICs were assembled in a non-aqueous medium with CuS particles and investigated for charge–discharge cycling in the potential window from 0.01 to 3 V. Cyclic voltammetry (CV) confirmed that at a high scan rate from 10 mV s −1 to 100 mV s −1, the CuS particles showed ideal capacitive behaviour. The calculated value of specific capacitance was 160 F g −1 for the CuS particles. At a scan rate of 1 mV s −1, 74.8% capacitive contribution was obtained from the CuS particles. Electrochemical impedance spectroscopy (EIS) revealed the interfacial interactions of the CuS particles with an Na-based electrolyte.