ZCO/CNT Composites Coated on Silver Substrates as Symmetric Supercapacitor and their Dielectrics Characterization at Various Frequencies

Abstract

<span>Supercapacitor is a high power density energy storage device which complements the lack of <span>batteries and conventional capacitors. One material which has a great potential in the <span>manufacture of composite supercapacitor is spinel ZnCo<span>2<span>O<span>4<span>/carbon nano tube and abreviated in <span>the later case as ZCO/CNT. Composition variations in ZCO/CNT composites is expected to the <span>performance of supercapacitor especially the dielectric properties and specific capacitance. In<br /><span>this study the composite ZCO/CNT was made from raw materials of ZCO nano crystal which <span>was prepared from previous research on which employing sonochemistry technic, carbon nano <span>tube, and 1-methil 2 pyrolidine. A screen printing method was used in this experiment to <span>deposite the composite on silver substrates. The separator in between of two identical composite <span>structures was prepared from isotactic polypropylene. We used KOH 6 M which was <span>implemented as electrolyte of the composites. Characterization of composite structures has been <span>performed using X-RD, while the morphology characterization using SEM. It was found that the <span>dielectric supercapacitor increase by increasing of mass fraction of ZCO in the composite. The<br /><span>highest dielectric constant is reached at 1.89 x 10<span>6 <span>and the specific capacitance of 81 F/g for 3:1<span>mass ratio of ZCO : CNT at 100 Hz.</span></span></span></span></span></span></span></span></span></span></span></span></span></span><br /></span></span></span></span></span></span></span>