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http://dx.doi.org/10.14478/ace.2017.1079

Oxyfluorination of Pitch-based Activated Carbon Fibers for High Power Electric Double Layer Capacitor  

Jung, Min-Jung (Department of Engineering chemistry and Applied Chemistry, Chungnam National University)
Ko, Yoonyoung (Department of Engineering chemistry and Applied Chemistry, Chungnam National University)
Kim, Kyung Hoon (Department of Engineering chemistry and Applied Chemistry, Chungnam National University)
Lee, Young-Seak (Department of Engineering chemistry and Applied Chemistry, Chungnam National University)
Publication Information
Applied Chemistry for Engineering / v.28, no.6, 2017 , pp. 638-644 More about this Journal
Abstract
Pitch based activated carbon fibers for electric double layer capacitor (EDLC) electrodes were treated by oxyfluorination via varying the ratio of fluorine and oxygen gases to improve high power property. As the partial pressure of fluorine increased, the oxyfluorinated activated carbon fibers showed an increase of linear fluorine functional groups. While the oxygen functional groups increased, no changes was observed with respect to the partial gas pressure. The specific surface area and pore volume decreased due to the etching reaction on the activated carbon fiber surface through oxyfluorination, but the mesopore volume increased about 4.5 times. In the case of activated carbon fibers treated with 50% of the fluorine gas partial pressure, the specific capacitance increased to about 29% and 61% at scan rates of 5 and 50 mV/s, respectively. The improvement of the specific capacitance was believed to be due to the introduction of oxygen and fluorine functional groups on the activated carbon fiber surface and the increase of mesopores through oxyfluorination.
Keywords
EDLC; activated carbon fiber; oxyfluorination; high power property;
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Times Cited By KSCI : 6  (Citation Analysis)
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