Fabrication of CuS/Cu₂S nanoparticles integrated with multi-walled carbon nanotubes for advanced energy storage applications

The investigation of high energy density supercapacitors has stimulated a great interest in the research community over the last decades. The structural morphology and surface area of electrode material of supercapacitor have a significant impact on its electrochemical performance. Thus, in the present work, CuS/Cu₂S nanoparticles and MWCNT/CuS/Cu₂S nanocomposites are prepared by simplest hydrothermal method. The prepared materials are characterized by number of specific techniques. Thereafter, synthesized materials are tested as electrode material for electrochemical capacitor. The specific capacity of 356 and 427.38 mA h g⁻¹ are observed from CuS/Cu₂S and MWCNT/CuS/Cu₂S nanocomposites at the current density of 1 A g⁻¹, respectively. Furthermore, aqueous asymmetric supercapacitor (ASC) is fabricated by MWCNT/CuS/Cu₂S and activated carbon (AC) and, high energy density of 70 W h kg⁻¹ is received from MWCNT/CuS/Cu₂S//AC at power density of 750 W kg⁻¹. Moreover, for electronic application, red color light emitting diodes (LEDs), toy motor fan and kitchen timer are functionalized by two MWCNT/CuS/Cu₂S//AC devices connected in series.