Journal
APPLIED SURFACE SCIENCE
Volume 550, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149266
Keywords
Electrical double-layer capacitors; Rate-performance; Activated carbon; Mesoporous structure; Fluorine-doped carbon
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1 A2 C1005836]
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Fluorine-doped mesoporous carbon (F-MAC), derived from Ecklonia cava, demonstrates high specific capacitance, excellent high-rate performance, and superior cycle stability, addressing the challenges of conventional activated carbon manufacturing process.
Owing to the increase in need for high-performance energy storage devices, activated carbon has attracted considerable attention as an electrode material for electrical double-layer capacitors (EDLCs). However, the conventional manufacturing process of activated carbon is seriously limited by the depletion of raw material sources. Biomass-based activated carbon, which is currently considered as a breakthrough, exhibits performance limitations such as low specific capacitance and poor high-rate performance. In this study, we propose the use of fluorine-doped mesoporous carbon (F-MAC), which is derived from Ecklonia cava using fluorine impregnation and KOH activation, to address the above challenges. F-MAC exhibits high specific capacitance (184 F/g), excellent high-rate performance (155 F/g at a current density of 20 A/g), and superior cycle stability (82.8% capacitance retention after 2,000 cycles). These performance improvements are attributed to the increased surface area, high mesopore volume fraction, fluorine-doping effect, and high concentration of oxygen functional groups.
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