Enhance the Electrochemical Parameters of Supercapacitor Using ZnO Based Electrode Material

Bare ZnO and 6wt% Manganese doped ZnO nanoparticles has been synthesized through the aqueous co-precipitation technique. The structural and phase purity have been verified through X-ray diffraction (XRD). The mean grain size determined by Scherrer’s formula is 26.29 nm and 20.52 nm for ZnO and Mn doped ZnO, respectively using FWHM corresponding to the highest peak intensity of (101). Scanning electron microscopy shows nano-flakes, and nano particles as the heterogeneous surface morphology. The nanoparticle’s elemental composition is matching with stoichiometric ratio. Thermal gravimetric analysis (TGA) has confirmed the thermal stability in the range of room temperature to 800 °C. Brunauer-Emmitt-Teller (BET) analysis has validated the ~60% increase in the specific surface area is 24.35 m2/g as compared to 15.25 m2/g for bare ZnO. At 5 mV/s scan rate, the calculated specific capacitance values for ZO and 6MZO is 80.06 and 483.20 (F/g) using 2M KOH electrolyte, respectively.