Journal
JOURNAL OF FLUORINE CHEMISTRY
Volume 132, Issue 12, Pages 1127-1133Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2011.06.046
Keywords
Fluorination; Phenol-based activated carbon; Electric double layer capacitor; Electrochemical properties
Categories
Funding
- MKE/KEIT [KI002177-2011-03]
- Korea Evaluation Institute of Industrial Technology (KEIT) [KI002177] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The surface of phenol-based activated carbon (AC) was fluorinated at room temperature with different F-2:N-2 gas mixtures for use as an electrode material in an electric double-layer capacitor (EDLC). The effect of surface fluorination on EDLC electrochemical performance was investigated. The specific capacitance of the fluorinated AC-based EDLC was measured in a 1 M H2SO4 electrolyte, in which it was observed that the specific capacitances increased from 375 and 145 F g(-1) to 491 and 212 F g(-1) with the scan rates of 2 and 50 my s(-1), respectively, in comparison to those of an unfluorinated AC-based EDLC when the fluorination process was optimized via 0.2 bar partial F-2 gas pressure. This enhancement in capacitance can be attributed to the synergistic effect of increased polarization on the AC surface, specific surface area, and micro and mesopore volumes, all of which were induced by the fluorination process. The observed increase in polarization was derived from a highly electronegative fluorine functional group that emerged due to the fluorination process. The increased surface area and pore volume of the AC was derived from the physical function of the fluorine functional group. (C) 2011 Elsevier B.V. All rights reserved.
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