Zeolitic Imidazolate framework ZIF-67 derived NPC/MoS2 as efficient supercapacitor electrode material /

Abstract

In this study, I aimed to synthesize a composite material by combining ZIF-67 (Co) and molybdenum disulfide (MoS2). ZIF-67 is a type of zeolitic imidazole framework, which was first synthesized and annealed in a reducing environment consisting of a mixture of argon and hydrogen gases. I added different amounts of annealed ZIF-67/NPC (nanoparticles) during the hydrothermal preparation of MoS2, keeping the amounts of Mo and S constant. I prepared three samples with different molar ratios of Mo to Co: Mo1:Co0.5, Mo1:Co1, and Mo1:Co2.X-ray diffraction (XRD) analysis was performed to confirm the formation of a MoS2/Co3S4 composite. The incorporation of Co/NPC significantly improved the electrochemical properties of MoS2. The specific capacitance of the samples was measured using electrochemical measurements, and found that the sample with equal masses of Mo and Co/NPC had a high specific capacitance of 612 F g-1. This indicated that the composite material had a high capacity to store electrical charge.Furthermore, the cyclic stability of the composite material was tested by subjecting it to 9000 cycles of charge and discharge. The material showed a high cyclic stability of 88.59%, indicating that it was durable and could maintain its electrochemical properties even after prolonged use. Among the three samples, the Mo1:Co1/CMS-2 sample showed the best performance, with the highest specific capacitance and cyclic stability. This result suggested that the Mo1:Co1 ratio was the optimum ratio for synthesizing the composite material. Overall, this study demonstrated the potential of ZIF-67-based MoS2 composites for use in energy storage applications.