Modification of multi-walled carbon nanotubes for electric double-layer capacitors: Tube opening and surface functionalization

Chi Chang Hu, Jen Hong Su, Ten Chin Wen

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58 Citations (Scopus)

Abstract

Multi-walled carbon nanotubes (MWCNTs) obtained opening the closed ends and using surface functionalization by means of a combination of partial oxidation in air and chemical modifications are characterized systematically in 0.3 M H2SO4 between 0 and 1.0 V, and these nanotubes were planned to be used as electrode materials in electric double-layer capacitors (EDLCs). Opening of MWCNTs, clearly observed by means of transmission electron microscopy (TEM), can be easily achieved by the partial oxidation in air through a seven-step temperature program identified by thermogravimetric/differential thermal analyses (TG/DTA). An increase in 175% specific capacitance is obtained for the MWCNTs, partially oxidized in air and chemically modified in H2SO4+HNO3. The temperature-programmed desorption (TPD) data showed that evolutions of CO and CO2 are, respectively, promoted by the application of partial oxidation in air and chemical modification in H2SO4+HNO3. The above increase in specific capacitance for modified MWCNTs is attributed to an obvious increase in the BET surface area (double-layer capacitance) and the density of oxygen-containing surface functional groups (pseudocapacitance).

Original languageEnglish
Pages (from-to)2353-2362
Number of pages10
JournalJournal of Physics and Chemistry of Solids
Volume68
Issue number12
DOIs
Publication statusPublished - 2007 Dec

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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