Electric double layer capacitors based on a composite electrode of activated mesophase pitch and carbon nanotubes

Cheng Wei Huang, Chien Te Hsieh, Ping-Lin Kuo, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

A novel composite of KOH activated mesophase pitch (aMP) and carbon nanotubes (CNTs) shows outstanding performance as an electrode for electric double-layer formation in 2 M H 2SO 4. The aMP powder is highly porous and the KOH activation may produce pores that are populated with graphitic edges. The resulting aMP electrode has a capacitance value of 295 F g -1 at 0.125 A g -1 discharge and decreases to 180 F g -1 at 100 A g -1. With particle milling, the pore diffusion resistance of the aMP electrode decreases significantly because of the elimination of a hindered diffusion mode from the particle interior. CNT addition provides inter-particle spacing and bridging media for the milled aMP and reduces the Warburg diffusion and electrical resistance. The composite of milled aMP and CNTs has capacitance values of 305 F g -1 at 0.125 A g -1 and 214 F g -1 at 100 A g -1. With a small potential window of 1 V, the resulting symmetric cells can deliver an energy level of 8.2 Wh kg -1 at a high power of 10000 W kg -1. These cells show superior stability, with no decay of specific capacitance after 10000 cycles of galvanostatic charge and discharge.

Original languageEnglish
Pages (from-to)7314-7322
Number of pages9
JournalJournal of Materials Chemistry
Volume22
Issue number15
DOIs
Publication statusPublished - 2012 Apr 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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