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

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/NPC_0.5), 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.