The specific capacitance of Al-CoS2@NG hybrid was found to be 1916 F g -1 in 2 M KOH solution at 1 A g -1 as well as 96% retention of capacitance after 10000 cycles and superior than both Al-CoS2 (850 F g -1 ) and CoS2-NG (210 Fg -1 ). The marked rise in capacitance was due to the fact that Al-CoS2@NG hybrid got a SBET of 221.5 m 2 g -1 which is significantly higher than Al-CoS2 (8.19 m 2 g -1 ). Additionally, the asymmetric solid-state supercapacitor (ASSc) was respectively. Also, the N-GNS-PdNP-PANI demonstrated the 96% of capacitance retained after 3000 cycles. Furthermore, the ternary composite was assembled as symmetric supercapacitor and attained the specific capacitance as well as energy density of 230 F g -1 and 31.9 W h Kg -1 along with remarkable capacitance retention of 97% after 5000 cycles. The . The PNGC gave the excellent specific capacitance of 213 F g -1 at 1 A g -1 in 6 M KOH aqueous solution which is appreciably larger than NGC (168 F g -1 ) and GC (10 F g -1 ). This was further confirmed by the fact that the SBET of PNGC and GC were found to be 500.4 and 211.4 m 2 g -1 , respectively. Likewise, the total pore volume of PNGC and GC were found to be 1.077 and 0.3341 cm 3 g -1 , respectively. It has been suggested that enriched capacitance was contributed by both wettability and the porous nature that were substantially amended due to The N, S RGO@Mxene was fabricated as a symmetric as well as all-solid-state supercapacitor and delivered the capacitance of 85.4 and 88.9 F g -1 in 6 M KOH aqueous solution and PVA-KOH gel, respectively. Moreover, the fabricated solid-state device achieved an energy density of 24.6 W h Kg -1 with the power density of 1400.6 W Kg -1 . Remarkably, both capacitance retention as well as coulombic efficiency remains unaltered after 20000 cycles for liquid -state symmetric supercapacitor, respectively shown in Fig. . The electrochemical supercapacitive performance of heteroatom doped graphene hybrid with metal oxide, sulphides, hydroxide and conducting polymer reported in the various literatures is exhibited in Table . with heteroatoms, such as g-C3N4, and BCN, are explored. Among the various heteroatoms, nitrogen stands out as a promising option due to its closely aligned atomic radius and electronic configuration with carbon. Multiple synthetic methodologies have been explored for fabricating heteroatom-doped graphene. However, the mechanistic aspects associated with the doping of heteroatoms onto the graphene framework through specific synthetic routes remain ambiguous.