Surface Oxidation Modification and Performance of Activated Carbon Electrode Material
Superscript text Commercial activated carbon was modified by surface treatment using nitric acid, The modified carbons were characterized by X-ray photoelectron spectroscopy (XPS).The resultant carbon electrode-based electric double-layer capacitors (EDLCs)were assembled with 1 mol/L （NH4）2SO4 as the electrolyte. The influence of introduced functional groups, such as hydroxyl and carbonyl, on the performance of EDLCs was studied by Constant current charge-discharge. These functional groups significantly improved the wettability of AC. As a result, the specific capacitance of the carbon modified with 40wt.%HNO3 achieved a specific capacitance of 223.45 F/g at a current density of 5mA/cm2, which is 100.9% higher than that of original AC.
Weiguo Pan, Jianxing Ren and Yongguang Li
R. Q. Wang and M. G. Deng, "Surface Oxidation Modification and Performance of Activated Carbon Electrode Material", Advanced Materials Research, Vols. 347-353, pp. 3456-3458, 2012