(iii) higher electrical conductivity of the hybrid electrode, which increased carrier transport and influenced the charge/discharge process. Murugesan et al. demonstrated the hierarchical mesoporous 3D-urchin-like Bi2S3@2D-g-C3N4 nanosheets synthesis through a superficial hydrothermal method . The 3D-Bi2S3@2D-g-C3N4 showed the SBET of 103 m 2 g -1 , and the average pore diameter of 3.43 nm. The 3D-Bi2S3@2D-g-C3N4 electrode exhibited the areal capacity of 41.53 µA h cm -2 at 1 mA cm -2 , and a rate capability of 62.77% along with 94.86% capacity retention after 5000 cycles in 1 M KOH aqueous electrolyte. Moreover, two similar electrodes of 3D-Bi2S3@2D-g-C3N4 sandwiched between the KOH and PVA gel electrolyte was assembled as symmetric supercapacitor, and obtained a high areal capacity of 25.40 µA h cm -2 at 1 mA cm -2 , power density of 1495 µW cm -2 , energy density of 31.7 µW h cm -2 , and the capacitance retention of 83.84% after 7500 cycles. The higher capacity, good rate capability, and long durability were attributed to the uniform morphology, synergistic effect, high specific surface area, mesoporous structure, and lower interfacial resistance of the 3D-Bi2S3@2D-g-C3N4 material. (H Rb-NiHCFg-C3N4) for all solid-state asymmetric supercapacitor studies . In this report, urea was used as a precursor for the synthesis of g-C3N4. The H Rb-NiHCFg-C3N4 material showed the SBET of 128.831 m 2 g -1 with an average pore volume, and average pore size of 0.139 cm 3 g -1 , and 3.775 nm, respectively. The specific surface area, average pore volume, and pore size of H Rb-NiHCFg-C3N4 was lower than that of H Rb-NiHCF (459.369 m 2 -1 , 0.339 cm 3 g -1 , and 3.082 nm), due to the incorporation of relatively low specific area of g-C3N4. In a three-electrode system, the H Rb-NiHCFg-C3N4 electrode exhibited the specific capacitance of 201.6 mA h Kg -1 at 1 A g -1 , and 901% capacitance retention after 5000 cycles in 1 M KOH aqueous electrolyte. Further, an all-solid state asymmetric supercapacitor (SASC) device was configured using HRb-NiHCFg-C3N4 and AC as the cathode and anode, respectively, and PVP/KOH was used as solid electrolyte. The HRb-NiHCFg-C3N4//AC SASC delivered the maximum specific capacitance of 144.3 F g -1 at 1 A g -1 , along with the energy density of 46.9 W h Kg -1 at 808.2 W Kg -1 . The SASC device demonstrated the cycling stability of 80% capacitance retention after 2000 cycles. Devarayapalli et al. analysed the performance of g-C3N4 nanosheets interconnected with V2O5 nanobelts as electrode for coin-cell type asymmetric supercapacitor device . In this study, V2O5 nanobelts with cetyltrimethylammonium bromide (CTAB) modified g-C3N4 (CCN/VO) was synthesized via a hydrothermal method, in which melamine was used as the precursor g-C3N4. For comparative studies, the V2O5/g-C3N4 hybrid was prepared without the addition of CTAB, and labelled as CN/VO. The SBET and pore volume CCN/VO was 73.45 m 2 g -1 , 0.245 cm 3 g -1 , and 22.8 nm, respectively, which were higher than that of CN/VO (54.07 m 2 g -1 , 0.176 cm 3 g -1 , and 26.5 nm).