TY - JOUR
T1 - Effects of microporosity on the specific capacitance of polyacrylonitrile-based activated carbon fiber
AU - Lee, Jong Gyu
AU - Kim, Je Young
AU - Kim, Sung Hyun
N1 - Funding Information:
This work was supported by the Core Technology Development Program of the Ministry of Commerce, Industry and Energy (MOCIE) in Korea. We are grateful for financial support.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2006/10/6
Y1 - 2006/10/6
N2 - Polyacrylonitrile (PAN)-based, microporous activated carbon fibers (ACFs) were investigated as electrode materials for electrochemical capacitors in KOH electrolyte solutions. PAN-ACFs were analyzed by using nitrogen adsorption data and the Dubinin-Raduskevich equation. The pore size distributions were narrow. As the micropore volume increased, the average micropore diameter decreased. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge profile analysis were used to investigate the penetrability of electrolyte ions into the carbon electrodes. The electrolyte ions in the carbon electrode with a large micropore diameter could be accessible easily even if the pore size distribution is narrow. However, the specific capacitance decreased in spite of the increase of the micropore volume.
AB - Polyacrylonitrile (PAN)-based, microporous activated carbon fibers (ACFs) were investigated as electrode materials for electrochemical capacitors in KOH electrolyte solutions. PAN-ACFs were analyzed by using nitrogen adsorption data and the Dubinin-Raduskevich equation. The pore size distributions were narrow. As the micropore volume increased, the average micropore diameter decreased. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge profile analysis were used to investigate the penetrability of electrolyte ions into the carbon electrodes. The electrolyte ions in the carbon electrode with a large micropore diameter could be accessible easily even if the pore size distribution is narrow. However, the specific capacitance decreased in spite of the increase of the micropore volume.
KW - Impedance spectroscopy
KW - Micropore
KW - PAN-ACF
KW - Specific capacitance
KW - Tension
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U2 - 10.1016/j.jpowsour.2006.02.016
DO - 10.1016/j.jpowsour.2006.02.016
M3 - Article
AN - SCOPUS:33748964475
SN - 0378-7753
VL - 160
SP - 1495
EP - 1500
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 2 SPEC. ISS.
ER -
