Facile Synthesis of Nitrogen-Doped Graphene Aerogels for Electrode Materials in Supercapacitors

摘要

Three-dimensional porous nitrogen-doped graphene aerogels (NGAs) were synthesized by using graphene oxide (GO) and chitosan (CS) via a self-assembly process by one-pot hydrothermal method.The morphology and structure of the as-prepared materials were characterized by means of scanning electron microscopy,transmission electron microscopy,X-ray diffraction,XPS spectroscopy,Raman spectroscopy,nitrogen adsorption/desorption measurement and Fourier transform infrared spectroscopy.The electrochemical performance of NGAs was studied by cyclic voltammetry,galvanostatic charge/discharge and impedance spectroscopy measurements.The microstructure,surface area and capacitance of NGAs could be facilely controlled by adding different amounts of chitosan.The prepared NGA-4 showed a specific capacitance of 148.0 F/g at the discharge current density of 0.5 A/g and also retained 95.3％ of the initial capacitance after 5000 cycles at the scan rate of 10 mV/s.It provided a possible way to obtain graphene based materials with high surface area and capacitance.