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Ultrafast supercapacitors based on boron-doped Ketjen black and aqueous electrolytes

Authors
Jin, QingPark, JinwooJi, NayoungKhandelwal, MahimaKim, Woong
Issue Date
30-10월-2022
Publisher
ELSEVIER
Keywords
Boron doping; Supercapacitor; Frequency response; AC line filtering; Wettability
Citation
APPLIED SURFACE SCIENCE, v.600
Indexed
SCIE
SCOPUS
Journal Title
APPLIED SURFACE SCIENCE
Volume
600
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/145656
DOI
10.1016/j.apsusc.2022.154181
ISSN
0169-4332
Abstract
Compact supercapacitors (SCs) are considered as a promising alternative to bulky aluminum electrolytic capacitors (AECs) for alternating current (AC) line filtering applications. Although the recently-developed SCs based on heteroatom-doped and/or macro/mesoporous carbon materials exhibit sufficiently fast response speeds for such applications, improvements in their performance characteristics (e.g., capacitance) would be highly desirable. In particular, the SCs with heteroatom-doped carbons have thus far exhibited limited capacitances at high frequencies (< 0.5 mF cm(-2) at 120 Hz). In the present work, SCs with boron (B)-doped mesoporous Ketjen black (KB) and a 6 M KOH electrolyte are shown to exhibit a high areal capacitance of 1.67 mF cm(-2), along with a high frequency response (negative phase angle, -Phi = 81.5 degrees) at 120 Hz. The excellent performance of the B-doped KB SCs can be attributed to the improved wettability and electrical conductivity, and to the increased number of capacitive sites due to the B-doping. This demonstration may greatly contribute to the development of high performance SCs suitable for high frequency applications.
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