Praveena et. al. reported the synergistic effect of electric double layer capacitor (EDLC), and pseudocapacitive behaviour of camphor sulphonic acid doped polycarbazole (PCz-g-C3N4) supercapacitor electrode . The g-C3N4 was prepared by thermal decomposition method using melamine. The PCz-g-C3N4 nanocomposite was prepared via chemical oxidative polymerization of carbazole using ammonium persulfate as oxidizing agent in ethanol, and water media. The EDX analysis showed N, O, and S heteroatoms with 30.95, 8.15, 1.0 at. %, respectively. In a two-electrode system using 1 M KOH aqueous electrolyte, the PCz-g-C3N4 nanocomposite electrode showed the specific capacitance of 199 F g -1 at 1 A g -1 , along with the stability over 1000 cycles. The observed specific capacitance value is attributed to the embedment of g-C3N4, on the pseudocapacitive porous PCz matrix, which supports the ions to have access into the inner porous electrode and facilitates the interfacial ion transfer between the electrode, and electrolyte material. Chen et al. reported the construction of 2D g-C3N4 nanosheets onto the surface of a 3D nanoporous gold (NPG) film through electrochemical deposition method to develop a hybrid electrode (NPG/g-C3N4)