Preparation of nitric acid modified carbon microspheres and  its electrochemical performance

Abstract

Abstract: In order to improve the specific capacity of carbon electrode materials, the polystyrene microspheres synthesized by suspension polymerization were carbonized at high temperature, and then modified carbon microspheres electrode materials were prepared by concentrated HNO₃ liquid phase treatment. The morphology and microstructure of the unmodified and modified carbon microspheres were characterized by emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), N₂ adsorption and desorption apparatus and Fourier transform infrared (FTIR) spectrometer,and the electrochemical properties of the modified carbon microspheres electrode materials were measured by cyclic voltammetry (CV) and constant current charge-discharge method. The results showed that the specific capacity of the modified carbon microspheres was up to 246 F/g at the current density of 0.625 A/g, and even at a high current density of 12.5 A/g, the specific capacity of the modified carbon microspheres was still higher than that of the unmodified carbon microspheres.

Key words: supercapacitors, carbon microspheres, suspension polymerization, electrochemical performance

CLC Number:

KOU Yuan-zhe, LIU Hao-rui, ZHAO Lei. Preparation of nitric acid modified carbon microspheres and its electrochemical performance[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 30-35.

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Preparation of nitric acid modified carbon microspheres and its electrochemical performance

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