Coprecipitation routed MWCNT/CdMn2O4 nanocomposite for high performance aqueous hybrid supercapacitor

A facile coprecipitation approach is used to synthesize CdMn 2 O 4 and a multi -walled carbon nanotube/CdMn 2 O 4 composite. The prepared CdMn 2 O 4 nanoparticles and multi -walled carbon nanotube/CdMn 2 O 4 composite are characterized by numerous characterization techniques and discussed. The TEM characterization reveals that CdMn 2 O 4 nanoparticles are attached with the multi -walled carbon nanotubes (MWCNTs). Further, the supercapacitive performance of CdMn 2 O 4 and MWCNT/CdMn 2 O 4 is investigated. High specific capacities ( Q s ) of 124.25 and 202 mAh g -1 are obtained at 1 A g -1 from CdMn 2 O 4 nanoparticles and MWCNT/CdMn 2 O 4 composite, correspondingly. The performance of cyclability of MWCNT/CdMn 2 O 4 indicates the long durability of the material for commercial application. Further, an aqueous hybrid supercapacitor (HSC) is assembled by MWCNT/ CdMn 2 O 4 and activated carbon (AC). MWCNT/CdMn 2 O 4 //AC delivers an energy density of 36.80 W h kg -1 at the power density of 775 W kg -1 with the current density of 1 A g -1 . Further, two yellow, two blue, two green, two red and two white color light emitted diodes (LEDs) are easily and separately lighted by two MWCNT/CdMn 2 O 4 //AC connected in series. As well, a kitchen timer and toy motor fan were powered by two MWCNT/CdMn 2 O 4 //AC connected in series.