Preparation of NiO/Agave-Derived Porous Carbon Composites and Their Electrochemical Properties
The nickel oxide was uniformly loaded onto the agave porous carbon by hydrothermal method and then by calcination treatment.The structure and morphology of the nickel oxide/agave-derived porous carbon composites were characterized by X-Ray Diffraction,Scanning Electron Microscope and Infrared Radiation.Furthermore,electrochemical properties of the nickel oxide/agave porous carbon composites were investigated by cyclic voltammetry test and charge-discharge test.The results show that NiO/C-2 has excellent property in energy density and cycling stability,exhibiting energy density of 22 W·h/kg and capacity retention of 91%after 10 000 cycles at a current density of 5 A/g.The specific capacitance of NiO/C-2 is 312 F/g at a current density of 1 A/g,and the capacity is still as high as 155 F/g when the current density is increased to 20 A/g.Therefore,based on the structural stability of agave porous carbon,the appropriate amount of NiO loading can enhance the capacity and cycling stability of the material.
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