Preparation of CNT@Ni-MOFs for application in supercapacitors
Metal-organic frameworks(MOFs)materials have attracted considerable attention in supercapacitors(SCs),owing to their high surface area,tailorable pore sizes and shapes,and various framework architectures.In this work,carbon nanotube@nickel-based metal-organic frameworks(CNT@Ni-MOFs)composites with excellent electrochemical properties were synthesized by a solvethermal method and characterized by X-ray diffraction,scanning electron microcopy and X-ray photoelectron spectrometry.The results show that the CNT@Ni-MOFs has a conductive network structure formed by flexible CNTs connected to Ni-MOFs in a rod-like structure with a diameter of about 0.5 μm and a length of 4-5 μm.The effect of reaction time on the structure and electrochemical performance of CNT@Ni-MOFs was investigated.The results showed that when the reaction time was 12 h,the growth of Ni-MOFs was complete and uniform,and the number of Ni-MOFs particles was moderate and uniformly loaded on CNT,which reduces the occurrence of agglomeration.The CNT@Ni-MOFs composite electrode has better specific capacitance performance than Ni-MOFs alone.The CNT@Ni-MOFs12 electrode exhibited a high specific capacitance of 719.8 F/g at a current density of 1 A/g,while that of Ni-MOFs was only 87.1 F/g and that of CNT was 43.5 F/g.Meanwhile,the specific capacitance retention of CNT@Ni-MOFs12 was about 96.8%after cyclic voltammetry for 1 000 cycles at a scan rate of 200 mV/s.
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维普
