Relationship between carbon nanotube structure and electrochemical behavior

Heterogeneous electron transfer at electrochemically activated carbon nanotubes

Martin Pumera, Toshio Sasaki, Hideo Iwai

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87 Citations (Scopus)

Abstract

The electrochemical activation of multiwalled carbon nanotubes (MWCNTs) (at potentials of 1.5-2.0 V vs Ag/AgCl for 60-360 s) results in significantly increased rate constants (kobs 0) for heterogeneous electron-transfer with [Fe(CN)6]3-/4- (from 8.34 × 10-5 cm s-1 for as-received MWCNTs to 3.67 × 10 -3 cm s-1 for MWCNTs that were electrochemically activated at 2.0 V for 180 s). The increase in the value of kobs 0 arises from the introduction of wall defects exposing edge planes of the MWCNTs, as observed by high-resolution TEM. The density of the edge plane defects increases from almost zero (for as-received MWCNTs) to 3.7% (for MWCNTs electrochemically activated at 2.0 V for 180 s). High-resolution X-ray photoelectron spectroscopy (HR-XPS), Raman spectroscopy, and electrochemical impedance spectroscopy were used to gain a better understanding of the phenomena. HR-XPS revealed that the increase in electrochemical activation potential increases the number of oxygen-containing groups on the surface of carbon nanotubes.

Original languageEnglish
Pages (from-to)2046-2055
Number of pages10
JournalChemistry - An Asian Journal
Volume3
Issue number12
DOIs
Publication statusPublished - 2008 Dec 1

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Carbon Nanotubes
Multiwalled carbon nanotubes (MWCN)
Activated carbon
Electrons
Photoelectron Spectroscopy
X ray photoelectron spectroscopy
Chemical activation
Defects
Dielectric Spectroscopy
Raman Spectrum Analysis
Electrochemical impedance spectroscopy
Raman spectroscopy
Rate constants
Oxygen
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

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title = "Relationship between carbon nanotube structure and electrochemical behavior: Heterogeneous electron transfer at electrochemically activated carbon nanotubes",
abstract = "The electrochemical activation of multiwalled carbon nanotubes (MWCNTs) (at potentials of 1.5-2.0 V vs Ag/AgCl for 60-360 s) results in significantly increased rate constants (kobs 0) for heterogeneous electron-transfer with [Fe(CN)6]3-/4- (from 8.34 × 10-5 cm s-1 for as-received MWCNTs to 3.67 × 10 -3 cm s-1 for MWCNTs that were electrochemically activated at 2.0 V for 180 s). The increase in the value of kobs 0 arises from the introduction of wall defects exposing edge planes of the MWCNTs, as observed by high-resolution TEM. The density of the edge plane defects increases from almost zero (for as-received MWCNTs) to 3.7{\%} (for MWCNTs electrochemically activated at 2.0 V for 180 s). High-resolution X-ray photoelectron spectroscopy (HR-XPS), Raman spectroscopy, and electrochemical impedance spectroscopy were used to gain a better understanding of the phenomena. HR-XPS revealed that the increase in electrochemical activation potential increases the number of oxygen-containing groups on the surface of carbon nanotubes.",
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