Mesoporous carbon spheres grafted with carbon nanofibers for high-rate electric double layer capacitors

Cheng Wei Huang, Chun Han Hsu, Ping Lin Kuo, Chien Te Hsieh, Hsisheng Teng

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

Carbon nanofibers were grafted onto mesoporous carbon spheres to produce "sea urchin-like" mesoporous carbon with a nanofiber content of 25 wt.%. Because of its combined features of high electronic conductivity and efficient electrolyte transport, the sea urchin-like mesoporous carbon assembled in electric double layer capacitors shows outstanding high-rate performance with a voltammetric scan rate as high as 3000 mV s-1. Ac impedance analysis shows that this method of carbon nanofiber grafting promotes electronic percolation and ionic transportation in the carbon electrode, reducing the capacitive relaxation time to less than one fourth of its original value. Electrochemical oxidation in sea urchin-like mesoporous carbon produces a capacitance increase of ca. 200% while retaining high electronic and ionic conductivities in the electrode.

Original languageEnglish
Pages (from-to)895-903
Number of pages9
JournalCarbon
Volume49
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1

Fingerprint

Carbon nanofibers
Carbon
Electrodes
Electrochemical oxidation
Ionic conductivity
Nanofibers
Relaxation time
Electrolytes
Capacitance
Supercapacitor

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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abstract = "Carbon nanofibers were grafted onto mesoporous carbon spheres to produce {"}sea urchin-like{"} mesoporous carbon with a nanofiber content of 25 wt.{\%}. Because of its combined features of high electronic conductivity and efficient electrolyte transport, the sea urchin-like mesoporous carbon assembled in electric double layer capacitors shows outstanding high-rate performance with a voltammetric scan rate as high as 3000 mV s-1. Ac impedance analysis shows that this method of carbon nanofiber grafting promotes electronic percolation and ionic transportation in the carbon electrode, reducing the capacitive relaxation time to less than one fourth of its original value. Electrochemical oxidation in sea urchin-like mesoporous carbon produces a capacitance increase of ca. 200{\%} while retaining high electronic and ionic conductivities in the electrode.",
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Mesoporous carbon spheres grafted with carbon nanofibers for high-rate electric double layer capacitors. / Huang, Cheng Wei; Hsu, Chun Han; Kuo, Ping Lin; Hsieh, Chien Te; Teng, Hsisheng.

In: Carbon, Vol. 49, No. 3, 01.03.2011, p. 895-903.

Research output: Contribution to journalArticle

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T1 - Mesoporous carbon spheres grafted with carbon nanofibers for high-rate electric double layer capacitors

AU - Huang, Cheng Wei

AU - Hsu, Chun Han

AU - Kuo, Ping Lin

AU - Hsieh, Chien Te

AU - Teng, Hsisheng

PY - 2011/3/1

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AB - Carbon nanofibers were grafted onto mesoporous carbon spheres to produce "sea urchin-like" mesoporous carbon with a nanofiber content of 25 wt.%. Because of its combined features of high electronic conductivity and efficient electrolyte transport, the sea urchin-like mesoporous carbon assembled in electric double layer capacitors shows outstanding high-rate performance with a voltammetric scan rate as high as 3000 mV s-1. Ac impedance analysis shows that this method of carbon nanofiber grafting promotes electronic percolation and ionic transportation in the carbon electrode, reducing the capacitive relaxation time to less than one fourth of its original value. Electrochemical oxidation in sea urchin-like mesoporous carbon produces a capacitance increase of ca. 200% while retaining high electronic and ionic conductivities in the electrode.

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