Construction of Ni-MOF derived NiS2@CNTs and its electrochemical properties
It is crucial to enhance the electrical conductivity and cycling stability of transition metal sulfides for high performance of super-capacitors.Herein,Nickel disulfide nanoparticles composite carbon nanotubes(NiS2@CNTs)were fabricated from Ni-MOF precursor af-ter carbonizing and vulcanizing processes.It is found that the NiS2 nanoparticles and CNTs of NiS2@CNTs composites,which are synthe-sized under the mass ratio of 1∶6 between Ni@CNTs and sublimated sulfur,presenting uniform dispersion and large specific surface area,providing abundant reactive sites,rapid ionic diffusion and strong electron transport efficiency for the electrochemical reaction.The tests show that the specific capacitance at NiS2@CNTs reached 568.0 F/g(0.5 A/g).By using NiS2@CNTs and activated carbon(AC)as positive and negative electrodes,NiS2@CNTs//AC device exhibites the maximum output energy density and power density of 15.6 Wh/kg and 3 207 W/kg,and displays as high as 98.1％of capacitance retention and 99.7％of coulombic efficiency after 5 000 cy-cles,showing that the electrode is expected to achieve lone-term recvcline and has a good practical application potential.
MOFstransition metal sulfidescarbon nanotubeselectrode materialssupercapacitors
万方数据
