Xu et al. fabricated the SnS2/g-C3N4 composite prepared by a simple hydrothermal method as the electrode material for supercapacitor . The SnS2/g-C3N4 composite delivered a specific capacitance of 552 F g -1 at 0.5 A g -1 in 3 M KOH, and also showed the cycling stability of 95.8% capacitance retention after 15000 cycles at high current density of 10 A g -1 . The observed high capacitive performance could be attributed to the synergistic effect of the SnS2/g-C3N4 heterostructure, which increases the conductivity of the electrode material. The authors report that the g-C3N4 is not only acted as a supporting material to prevent the accumulation of SnS2, but also the higher nitrogen content in g-C3N4 has improved the properties such as charge transfer, wettability, and conductivity of the materials, which cohesively lead to the improvement of capacitance value than those of traditional carbon materials.