The electrochemical stability of carbon makes it ideal for energy storage applications. Graphitic carbon nitride (g-C3N4) is a highly nitrogen-containing carbonaceous material that has good cyclic stability for supercapacitor applications but low electrical conductivity. Recent research shows that incorporating transition metal oxides into g-C3N4 significantly boosts its specific capacitance. We synthesized Zinc oxide (ZnO)-modified g-C3N4 nanosheets through a sol-gel route. This hybrid electrode exhibited a high specific capacitance of 136.3 F/g at a current density of 1 A/g. Remarkably, it retained 71.1% of its rate capability even at a high current density of 4 A/g in 6 M KOH electrolyte. After 2000 GCD cycles at a high current density of 4 A/g, the hybrid electrode exhibited improved performance, maintaining an impressive 103.8% capacitance retention and a remarkable increase in coulomb efficiency, reaching close to 100%. C1 [Vijay, Aromal M.] Noorul Islam Ctr Higher Educ, Dept Phys, Kumaracoil 629180, Tamil Nadu, India. [Gobalakrishnan, S.] Rajalakshmi Engn Coll, Dept Humanities & Sci Phys, Chennai 602105, India. [Chidhambaram, N.] Rajah Serfoji Govt Coll Autonomous, Dept Phys, Thanjavur 613005, Tamil Nadu, India. [Asaithambi, P.] Jimma Univ, Jimma Inst Technol, Fac Civil & Environm Engn, Jimma POB 378, Ethiopia. [Kavinkumar, T.] Karpagam Acad Higher Educ, Fac Engn, Dept Sci & Humanities Phys, Coimbatore 641021, Tamil Nadu, India. [Thirumurugan, Arun] Univ Atacama, Sede Vallenar, Ave Costanera 105, Vallenar 1612178, Chile. C3 Rajalakshmi Engineering College; Jimma University; Karpagam Academy of Higher Education (KAHE); Universidad de Atacama