Preparation of carbon material for supercapacitor by vacuumizing

By vacuumizing method,BP2000 carbon owning large specific surface area was prepared in supercapacitor.The performance of the capacitor was studied by cyclic voltammograms,constant current charge/discharge methods and impedance test.The best time of vacuumizing was 30 min,the specific capacitance of carbon electrode was 260.1 F/g,more than that of original carbon electrode 200%;the specific capacitance of capacitor was 84.01 F/g that enhanced by 85.17% than that of no-vacuumizing;also the specific capacitance of 1 000 times declined 34.9% under current density of 3 A/g.These results show that the capacitor has the typical character of capacitance.