Facile synthesis of MWCNT/CuCr2O4 nanocomposite for aqueous hybrid supercapacitor

Abstract

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 nano- particles 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.