The rational investigation of bimetallic selenides as electrode materials for hybrid supercapacitors

• Published in: Electrochimica acta 2022-08, Vol.424, p.140627, Article 140627
• Main Authors: Garlapati, Kiran Kumar, Nath, Anish R., Arjun, Ajith Mohan, Vijayan, Aruna, Sandhyarani, N.
• Format: Article
• Language: English
• Subjects: Bimetallic selenide; Hybrid supercapacitor; Nickel-cobalt selenide; Nickel-copper selenide
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2022.140627

Cobalt is an ideal material for application in energy storage devices owing to its superior stability and redox activity. However, there has been a rise in demand for cobalt-based energy storage devices, which cannot be satisfied because of cost considerations. To balance demand and cost, cost-effective alternatives like copper can be envisaged. The present work underlines the potential of nickel-copper selenide as a suitable replacement for nickel-cobalt selenide electrodes for hybrid supercapacitor (HSCs) application. In half cell testing, NiCuSe and NiCoSe deliver a specific capacity of 127.2 mAh g−1 and 177.2 mAh g−1, respectively, at a current density of 3 A g−1. NiCuSe exhibits more stable charge storage than NiCoSe at high current densities owing to its superior conductivity. Aqueous HSCs, NiCuSe// modified activated carbon (MAC) and NiCoSe//MAC deliver an energy density and power density of 26.56 Wh kg−1 at 2.732 kW kg−1 and 28.78 Wh kg−1 and 2.571 kW kg−1, respectively. NiCuSe//MAC shows superior rate capability, and both devices exhibit superior cycle life for 12,000 cycles. [Display omitted] .