Study on Preparation and Capacitive Performance of PVP-Based Porous Carbon Materials
Using polyvinylpyrrolidone(PVP)as a novel nitrogen-containing carbon source,polymer-based nitrogen-doped porous carbon materials were prepared by carbonization activation method.The influence of carbonization activation temperature on the electrochemical and capacitor performance of the prepared carbon materials was studied.The results showed that different carbonization activation temperatures had a certain effect on the morphology of the prepared carbon materials,and XPS analysis confirmed the successful doping of nitrogen in the prepared carbon materials.In the three-electrode system,the prepared carbon material exhibited the best electrochemical and capacitor performance at 800℃.The carbon material(PVP-800)prepared at this temperature had a specific capacitance of up to 319 F·g-1 at a current density of 0.5 A·g-1,and a specific capacitance of 243 F·g-1 at a current density of 10 A·g-1,demonstrating excellent capacitor and rate performance.In the two-electrode system,the energy density of the composed supercapacitor was the highest at 6.77 W·h·kg-1,and after 10 000 cycles at a current density of 2 A·g-1,the capacity retention remained at 90.7%of the original,demonstrating excellent specific capacitance and cycling stability.
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