Surface Oxidation Modification and Performance of Activated Carbon Electrode Material

Ren Qing Wang; Mei Gen Deng

doi:10.4028/www.scientific.net/AMR.347-353.3456

Paper Titles

Synthesis and Electrochemical Performance of LiFe_1-xMn_xPO₄/C Cathode Material
p.3434

Preparation and Modification of Nano-Li₄Ti₅O₁₂ Anode Material
p.3439

Enhanced Electrochemical Properties of LiFePO₄/C Cathode Material by Metal Oxide Coating
p.3443

Thermoelectric Properties of CoSb₃ Nanoparticle Films
p.3448

Surface Oxidation Modification and Performance of Activated Carbon Electrode Material
p.3456

High-Rate LiFePO₄ Electrode Material Synthesized by Chemical Grinding Method
p.3459

Synthesis and Characterization of High Electrocatalytic Active Nanosized RuO₂ Powder with Narrow Distribution by Ultrasonic Precipitation
p.3464

Optical Parameters of Diamond Films Determined by Spectroscopic Ellipsometry Method
p.3468

Synthesis and Characterization of Nanometer Copper Ferrite by Auto-Combustion
p.3472

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Surface Oxidation Modification and Performance of Activated Carbon Electrode Material

Abstract:

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.