Influence of Pore Structure of Coal-based Activated Carbons on Electric Double Layer Capacitance
ZHANG Chuan-xiang
PAN lan-ying
JIAO Hong-guang
ZHAN Liang
QIAO Wen-ming
LING Li-cheng
Abstract：The anthracite activated by KOH was used to prepare high-performance activated carbons as electrodes for electrochemical double-layer capacitors (EDLCs). Porous structure and electrochemical characteristics of the carbons were investigated by nitrogen sorption and electrochemical methods, respectively. The effect of pore structure on the electrochemical per-formance of the as-prepared carbons was studied. The results show that the carbons activated by KOH exhibit large surface areas (1 048-3 581 m~2/g), various ratio of mesopore volume (7%-91%), and high capacitance in 3 mol/L KOH electrolyte (332 F/g) and 1 mol/L (C_2H_5)_4 NBF_4/propylene carbonate (PC) electrolyte (190 F/g). The electrochemical perform-ance of the carbons was enhanced by the presence of the pores of 2-3 nm, which ensured a low impedance and a sufficient utilization of the exposed surface for charge storage, due to electro-lyte ions could easily penetrate the pores and access the porosity.
Keywords：activated carbonelectrochemical double-layer capacitorselectrochemical perform-ancepore structure
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 697-701 )