Synthesis of MWCNT/CoCr₂O₄ for high performance aqueous hybrid supercapacitor

In this work, CoCr₂O₄ nanoparticles with size of ∼12 nm are prepared by co-precipitation process. Further, various characteristics techniques are used to describe the phase purity, morphology and porous nature of CoCr₂O₄ nanomaterial. Thereafter, CoCr₂O₄ nanoparticles are used for supercapacitor and high specific capacitance of 769 F g⁻¹ is received at the current density of 1 A g⁻¹. Further, specific capacitance of CoCr₂O₄ nanoparticles is enhanced by adding up a small quantity of multi-walled carbon nanotubes (MWCNTs) and, enhanced specific capacitance of 1100 F g⁻¹ is received from MWCNT/CoCr₂O₄ at 1 A g⁻¹. Additionally, aqueous hybrid supercapacitor (HSC) is assembled by MWCNT/CoCr₂O₄ and activated carbon which exhibits the high energy density of 41.33 W h kg⁻¹ at the power density of 750.11 W kg⁻¹. Furthermore, four parallel connected white color light-emitting diodes (LEDs), small motor fan and kitchen timer are powered separately by series connected two MWCNT/CoCr₂O₄//AC devices.