Conversion of Lagenaria Siceraria peel to reduced graphene oxide doped with zinc oxide nanoparticles for supercapacitor applications

Graphene oxide was derived from Lagenaria Siceraria peel and the ZnO nanoparticles were synthesized using the green synthesis method. Zn1–xO-rGOx was synthesized with different concentrations (x = 0.1, 0.2, 0.3) that were referred as S1, S2, and S3, respectively. The rGO-ZnO nanoparticles have been characterized with XRD, DLS, zeta potential, FTIR, FT-Raman, UV, SEM, TEM, EDAX and mapping analysis. The charge storage, cycle stability of the rGO-ZnO nanoparticles were explored using cyclic voltammetry. The highest specific capacitance for nanoparticles was determined to be 371, 382 and 398 F/g for S1, S2, and S3 at the scan rate close to 10 mV/s.