Synthesising of ZnO nanopetals for supercapacitor applications

ZnO nanopowders have been synthesised using the spray pyrolysis method. XRD analysis reveals the powder samples to be of crystallite size 19 nm. SEM images indicate petal-like formation for the zinc oxide powder. The electrochemical properties have been studied using cyclic-voltammetric and chrono-potentiometric techniques. The specific capacitance of the ZnO electrode in the presence of 2M KOH electrolyte was 365 F/g at a scan rate of 5 mV/s. The decrease in the specific capacitance of 22% has been observed after 1200 cycles.