Preparation And Electrochemical Performance Of Melamine Resin-based Composite Material Containing Heteroatomic Carbon

The heteroatom-enriched carbon material(HC-FG)was synthesized by mixing the melamine formaldehyde resin(MF)oligomer solution and flake graphite(FG),Subsequently the simple carbonization process.HC-EG and HC-GO were prepared by the same method.Then the materials were assembled into supercapacitors.The prepared materials were characterized by SEM,XPS,Raman,TG and their electrochemical properties were tested by cyclic voltammetry,galvanostatic charge-discharge and impedance spectroscopy methods.The influences of the carbonization temperature and the composite ratio on the performance of the electrode materials and their supercapacitors were studied.Results show for HC-FG that with the increasing of the carbonization temperature,the nitrogen content of HC-FG decreases from 18.04 at.% to 8.40 at.% and the oxygen content of HC-FG increases from 9.03 at.% to 16.21 at.%.The increasesing graphitized carbon content is beneficial for the improvement of the conductivity.The higher content of flake graphite,the better conductivity of HC-FG is observed.Under the optimal carbonization condition of 800 ?,the best composite ratio of 0.013:1,the obtained HC-FG3 contains more nitrogen and oxygen atoms which can provide more pseudocapacitance.The specific capacitance of HC-FG3 is 137.34 F/g,which shows the best electrochemical properties.HC-FG3 and its supercapacitor exhibit good electrochemical properties and stability.For HC-EG,with the increase of the carbonization temperature,the nitrogen content of HC-EG decreases from 18.01 at.% to 9.65 at.% and the oxygen content of HC-EG increases from 7.96 at.% to 12.65 at.%.The increasesing graphitized carbon content is beneficial for the improvement of the conductivity.The higher content of expanded graphite,the better conductivity of HC-EG is observed.Under the optimal carbonization condition of 700 ?,the best composite ratio of 0.009:1,the obtained HC-EG2 contains more nitrogen and oxygen atoms which can provide more pseudocapacitance.The specific capacitance of HC-EG2 is 147.27 F/g,which shows the best electrochemical properties.HC-EG2 and its supercapacitor exhibit good electrochemical properties and stability.For HC-GO,with the increase of the carbonization temperature,the nitrogen content of HC-GO decreases from 12.67 at.% to 6.63 at.% and the oxygen content of HC-GO decreases from 17.03 at.% to 16.35 at.%.The increasesing graphitized carbon content is beneficial for the improvement of the conductivity.The more content of grapheme oxide,the better conductivity of HC-GO is observed.Under the optimal carbonization condition of 800 ?,the best composite ratio of 0.013:1,the obtained HC-GO3 contains more nitrogen and oxygen atoms which can provide more pseudocapacitance.The specific capacitance of HC-GO3 is 154.07 F/g,which shows the best electrochemical properties.In the range of these experiments,HC-GO3 and its supercapacitor exhibit best electrochemical properties and stability.