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

Qing Jin, Jinwoo Park, Nayoung Ji, Mahima Khandelwal, Woong Kim

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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, −Φ = 81.5°) 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.

Original languageEnglish
Article number154181
JournalApplied Surface Science
Publication statusPublished - 2022 Oct 30

Bibliographical note

Funding Information:
This work was supported by grants from the National Research Foundation of Korea (NRF- 2020R1A2C2008798 ) and Korea University.

Publisher Copyright:
© 2022 Elsevier B.V.


  • AC line filtering
  • Boron doping
  • Frequency response
  • Supercapacitor
  • Wettability

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces


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