Palanivel et. al. studied the construction of ZnFe2O4/g-C3N4 nanocomposite for enriched charge storage electrode for supercapacitor and visible light active photocatalytic applications . The composite was synthesized via sol-gel followed calcination method using melamine, and zin nitrate hexahydrate as precursors for g-C3N4 and ZnFe2O4. The electrochemical capacitance nature of the ZnFe2O4/g-C3N4 electrode was studied in a threeelectrode system using 6 M KOH aqueous electrolyte. The composite electrode delivered the specific capacitance of 103 F g -1 at 10 A g -1 , 94% capacitance retention after 5000 cycles, which was higher than the specific capacitance of ZnFe2O4 (71 F g -1 at 10 A g -1 ). The nitrogen present in the g-C3N4 matrix has found to promote not only the charge transport pathway, but also increased the capacitance and ion diffusion capability. Further, the capability of the fabricated FISCs as a sustainable energy system was tested by CoAl-LDH/g-C3N4 was prepared by varying the g-C3N4 content , and the materials were referred as GL10, GL30, and GL50, respectively. The GL30 sample displayed the highest SBET of 174 m 2 g -1 , while compared to CoAl-LDH (12 m 2 g -1 ), g-C3N4 (136 m 2 g - 1 ), GL10 (52 m 2 g -1 ), and GL50 (70.14 m 2 g -1 ). Accordingly, in three-electrode system using 2 M KOH aqueous electrolyte, the GL30 electrode demonstrated the highest specific capacitance of 343.3 F g -1 at 5 A g -1 against CoAl-LDH (94.3 F g -1 ), g-C3N4 (73.2 F g -1 ) GL10 (306.6 F g - 1 ), and GL50 (86.6 F g -1 ). The GL30 electrode could retain about 95.28% after 6000 cycles, and its Coulombic efficiency remained above 97% over 6000 cycles. In addition, an asymmetric supercapacitor cell was assembled using GL30 nanocomposite as the positive electrode, and activated carbon as the negative electrode, which provided the energy density of 61.15 W h Kg -1 and the power density of 13,994.66 W Kg -1 . The recorded high electrochemical performance of GL30 nanocomposite electrode was reported to be the consequence of a synergistic effect between g-C3N4 nanosheets with high specific surface area.