Facile synthesis of MWCNT/CuCr₂O₄ nanocomposite for aqueous hybrid supercapacitor

Design and fabrication of high performing energy storage devices using multi-walled carbon nanotube decorated transition metal oxides have become research interest in energy storage field. Addressing this, CuCr₂O₄ nanoparticles are successfully synthesized by most adoptable co-precipitation process. Further, CuCr₂O₄ nanomaterial is used for supercapacitor and high specific capacity of 72.5 mAh g⁻¹ is received at 1 A g⁻¹. The capacity of the pristine CuCr₂O₄ nanoparticles is enhanced by adding up little quantity of multi-walled carbon nanotubes (MWCNTs). MWCNT/CuCr₂O₄ nanocomposite produces an improved capacity of 108.5 mAh g⁻¹ at 1 A g⁻¹. The cyclability of MWCNT/CuCr₂O₄ is performed at 5 A g⁻¹ and, retention of 96 % (higher from CuCr₂O₄) is obtained after 6000 cycles. Moreover, the as-fabricated aqueous hybrid supercapacitor (HSC) designed by MWCNT/CuCr₂O₄ and activated carbon achieves high energy density of 32.46 W h kg⁻¹ at power density of 775 W kg⁻¹. In addition, four parallel connected yellow color LEDs, toy motor fan and kitchen timer are powered separately by series connected two HSCs.