Preparation and electrochemical performance of MOF-derived carbon composite electrode materials
Aiming at the problem of low specific capacitance of activated carbon,utilizing the large specific sur-face area and abundant pore structure of metal organic frameworks(MOFs),a synergistic bilayer mechanism with pseudocapacitive properties of MOFs-derived porous carbon hybrid composites with activated carbon was investigated in this paper.N-doped porous carbon composites were prepared by designing different Zn/Co ratios and carbonization temperatures.ZCPC@AC-800 was tested in a three-electrode system and showed a specific ca-pacitance of 327.5 F/g at 0.5 A/g,which was higher than that of the MOF-derived porous carbon composites generated from monometallic atoms,due to the fact that the bimetallic MOFs in the nanocomposites could pro-vide a more diverse range of active sites during pyrolysis.In addition,symmetric supercapacitors(ZCPC@AC-800//ZCPC@AC-800)assembled in a 3 mol/L KOH electrolyte with a potential window of 0-1.5 V have an en-ergy density of 21 Wh/kg at a power density of 375 W/kg.After cycling test,its initial specific capacitance re-mained 80％after 5 000 times of charging and discharging at 5 A/g.
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