Effect of fluorine functional groups introduced into activated carbon aerogel by carbon tetrafluoride plasmas in supercapacitors

Fluorine heteroatoms were introduced to increase the limited specific capacitances of electric double-layer capacitors (EDLCs), and the effects of the fluorine atoms were analyzed. To introduce the fluorine, a CF4 plasma treatment was used that introduced the fluorine atoms quickly. Among the fluori...

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Bibliographic Details
Published in:Carbon Letters 2024, 34(1), , pp.65-74
Main Authors: Myeong, Seongjae, Ha, Seongmin, Lim, Chaehun, Min, Chung Gi, Lee, Young-Seak
Format: Article
Language:English
Subjects:
Activated carbon
Aerogels
Capacitance
Charge transfer
Chemical bonds
Electrodes
Electrolytes
Electrons
Energy storage
Fluorine
Functional groups
Gases
Nitrogen
Plasma
Temperature
Tetrafluoromethane
Voltammetry
자연과학일반
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Summary:Fluorine heteroatoms were introduced to increase the limited specific capacitances of electric double-layer capacitors (EDLCs), and the effects of the fluorine atoms were analyzed. To introduce the fluorine, a CF4 plasma treatment was used that introduced the fluorine atoms quickly. Among the fluorine functional groups in the F6-ACA framework, the semi-ionic C–F bonds induced rapid charge transfer and imparted pseudocapacitance. Consequently, we achieved a specific capacitance of 325.68 F/g for the F6-CA sample at 0.5 A/g. By analyzing the contributions of the electric double-layer capacitance and the pseudocapacitance, we determined that the contribution from the pseudocapacitance was 37.57%. A remarkable specific capacitance retention rate of 95.87% was obtained over 1000 charge/discharge cycles with a high current density of 3 A/g. Additionally, the semi-ionic C–F bonds reduced the charge transfer resistance ( Rct) by 36.8%. Therefore, the specific capacitance was improved by the fluorine heteroatoms, and the semi-ionic C–F bonds played a pivotal role in this improvement.
ISSN:1976-4251
2233-4998
DOI:10.1007/s42823-023-00668-z