Herein, a straightforward, and mild synthetic co-precipitation method is used to prepare Cr-ZnO/RGO nanocomposite to be used in supercapacitor applications. First, the chromium (Cr) doping concentration in zinc oxide (ZnO) nanoparticles was systematically varied (2, 4, 6, 8, and 10%) to evaluate its influence on the electrochemical performance. The composite was constructed by combining reduced graphene oxide (RGO) with 8% Cr-ZnO, which showed the best redox potential among the compositions unde