Fundamental Electrochemical Properties of Carbon Nanotube Electrodes

P Papakonstantinou, R Kern, L Robinson, H Murphy, J Irvine, ET McAdams, JAD McLaughlin, T McNally

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We report on the fundamental electrochemical properties of inherently hydrophobic Multiwalled Carbon Nanotubes MWNT electrodes and acid treated MWNTs. The electrochemical response of the electrodes was investigated by cyclic voltammetry and ac impedance spectroscopy using the redox probe of (Fe(CN)63-/Fe(CN)64-, which has well-known kinetic behaviour on carbon surfaces. Comparisons were made between the electrochemical behaviour observed at MWNT electrodes and electrochemically polished glassy carbon, GCE. Confirmation of carbon oxygen functionalities on the surface of acid treated nanotubes was accomplished by X-ray photoelectron spectroscopy. Slow electron transfer kinetics with a peak separation larger than 200 eV, and an electron transfer resistance of approximately 370 were observed on pristine MWNTs. However acid treatment was found to significantly improve the electron transfer kinetics of Fe(CN)6-3/-4 redox couple, approaching almost reversible ET kinetics. Acid treatment modifies the charge carrier density at the surface by introducing surface states and serves to facilitate electron transfer. The better wetting properties of functionalised carbon nanotubes and the higher local density of states as compared to untreated MWNT could be responsible for favouring faster ET kinetics. Copyright Taylor & Francis 2005
LanguageEnglish
Pages91-108
JournalFullerenes, Nanotubes and Carbon Nanostructures
Volume13
Issue number2
DOIs
Publication statusPublished - 2005

Fingerprint

Carbon Nanotubes
Electrochemical properties
Carbon nanotubes
carbon nanotubes
electron transfer
Electrodes
Kinetics
electrodes
kinetics
acids
Acids
Electrons
Carbon
Multiwalled carbon nanotubes (MWCN)
carbon
glassy carbon
Glassy carbon
Surface states
Charge carriers
Nanotubes

Keywords

  • Electrochemical sensors
  • oxidation
  • impedance spectroscopy
  • acid treatment
  • electron transfer kinetics

Cite this

Papakonstantinou, P ; Kern, R ; Robinson, L ; Murphy, H ; Irvine, J ; McAdams, ET ; McLaughlin, JAD ; McNally, T. / Fundamental Electrochemical Properties of Carbon Nanotube Electrodes. In: Fullerenes, Nanotubes and Carbon Nanostructures. 2005 ; Vol. 13, No. 2. pp. 91-108.
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Fundamental Electrochemical Properties of Carbon Nanotube Electrodes. / Papakonstantinou, P; Kern, R; Robinson, L; Murphy, H; Irvine, J; McAdams, ET; McLaughlin, JAD; McNally, T.

In: Fullerenes, Nanotubes and Carbon Nanostructures, Vol. 13, No. 2, 2005, p. 91-108.

Research output: Contribution to journalArticle

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