Development of 2.8 V Ketjen black supercapacitors with high rate capabilities for AC line filtering

Yongju Yoo, Jinwoo Park, Min Seop Kim, Woong Kim

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Supercapacitors are generally more compact than conventional bulky aluminum electrolytic capacitors (AECs). Replacement of AECs with supercapacitors can lead to miniaturization of electronic devices. However, even state-of-the-art supercapacitors developed in laboratories are superior to or competitive with AECs only in low voltage applications (<∼40 V). In order to improve the voltage limits of current supercapacitors, we have incorporated Ketjen black (KB) as an electrode material. Utilizing the open pore structure and the graphitic nature of KB, we demonstrate that the voltage limit can be extended to 53 V. The KB supercapacitor exhibits excellent areal capacitance, cell voltage, and phase angle values of ∼574 μF cm−2, 2.8 V, and ∼−80°, respectively. In addition, we demonstrate that an AC line filtering circuit with three supercapacitors connected in series can extend the application voltage without significant sacrifice in rate capability (ϕ ∼ −77° at 120 Hz). On the other hand, KBs are much less expensive than carbon materials previously demonstrated for AC line filtering and hence are very attractive for practical applications. We believe that this demonstration of high-performance supercapacitors made from low-cost carbon materials is both scientifically interesting and important for practical applications.

Original languageEnglish
Pages (from-to)383-390
Number of pages8
JournalJournal of Power Sources
Publication statusPublished - 2017


  • Frequency response
  • Ketjen black
  • Mesoporous carbon
  • Organic electrolyte
  • Supercapacitor

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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