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High Power Density Electric Double Layer Capacitor with Improved Activated Carbon
Author(s) -
Hui Yang,
HuiJun Jiang,
TianHong Lu
Publication year - 2003
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20030210202
Subject(s) - chemistry , capacitance , electrolyte , activated carbon , capacitor , analytical chemistry (journal) , electric double layer capacitor , power density , specific surface area , carbon fibers , x ray photoelectron spectroscopy , supercapacitor , chemical engineering , catalysis , voltage , electrode , chromatography , power (physics) , composite material , organic chemistry , adsorption , electrical engineering , materials science , composite number , engineering , quantum mechanics , physics
The improvement on commercial activated carbon (AC) through the reactivation under steam in the presence of NiCl 2 catalyst leads to the increases of both energy and power densities of electric double layer (dl) capacitors. When AC was treated at 875 °C for 1 h, its discharge specific capacitance increases up to 53.67 F· g −1 , an increase of about 25% compared to the as‐received AC. Moreover, a significant increase in high rate capability of electric dl capacitor was found after the improvements. Surprisingly, both the treated and untreated AC samples showed similar specific surface area and pore size distribution, but some changes in the surface groups and their concentrations after reactivation were verified by X‐photoelectron spectra. Thus, it is reasonable to conclude that the decrease in the surface concentration of the carbonyl‐containing species for the improved AC results in an increase of accessibility of the pores to the organic electrolyte ion, causing the enhancements of both the specific capacitance and high rate capability.