Zeolitic imidazolate framework (ZIF) derived MoS2/Co3S4/NPC as the supercapacitor electrode material

Abstract

Here in, we report the synthesis of a ZIF-67-based Molybdenum disulfide composite and analyze the structural and electrochemical properties of the material. A class of zeolitic imidazole framework ZIF-67 (Co) was first synthesized and annealed in a reducing (Ar/H2) environment. To form Co/NPC (Nano-porous Carbon). Then different masses of Co/NPC were added during the hydrothermal preparation of MoS2 to check the effect of Co/NPC while the amounts of Mo and S were kept constant. Three samples with different mass ratios CMS-1 (Mo1:Co/NPC0.5), CMS-2 (Mo1:Co/NPC1), CMS-3 (Mo1:Co/NPC2) were prepared. XRD analysis confirmed the formation of MoS2/Co3S4/NPC composite. Electrochemical measurement showed a high specific capacitance of 612F g−1 for the sample having equal mass ratio of Mo and Co/NPC i.e CMS-2. The incorporation of Co/NPC significantly improved the electrochemical properties of MoS2. The material also showed a high cyclic stability of 88.59% after 9000 cycles. Among the three samples, the Mo1:Co/NPC1 /CMS-2 showed the best performance hence proving to be the optimum ratio.