Unraveling the electrochemical properties of CuCo2S4 nanoflakes adorned on multi-walled carbon nanotubes for high-performing aqueous asymmetric supercapacitor

Abstract

Bimetallic transition metal sulfides have come into sight as viable materials for future-oriented supercapacitors owing to their ability to concurrently assure high conductivity and stability during electrochemical processes. Therefore, in the present work, CuCo2S4 nanoflakes are prepared by feasible hydrothermal technique. The prepared material is characterized by numerous characteristic techniques. Further, the electrochemical characteristics of CuCo2S4 nanoflakes are investigated. The CuCo2S4 nanoflakes electrode exhibits 800 F g−1 of specific capacitance at 1 A g−1. Further, the capacitance of CuCo2S4 is boosted by adding up a modest quantity of multi-walled carbon nanotubes (MWCNTs), and enhanced specific capacitance of 1086 F g−1 is attained at 1 A g−1 from MWCNT/CuCo2S4 nanocomposite. Finally, asymmetric supercapacitor (ASC) is fabricated by MWCNT/CuCo2S4 and activated carbon (AC). Further, 34.08 W h kg−1 of energy density is observed with power density 775 W kg−1 from MWCNT/CuCo2S4//AC. Furthermore, different color light-emitting diodes (LEDs), kitchen timer and small motor fan are powered by two MWCNT/CuCo2S4//AC connected in series. © 2024 Elsevier Ltd