Metallic impurities within residual catalyst metallic nanoparticles are in some cases responsible for "electrocatalytic" effect of carbon nanotubes

Martin Pumera, Hideo Iwai

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

We show that in some cases, the metallic impurities within residual catalyst metallic nanoparticle impurities, which remain in carbon nanotubes from their synthesis even after purification, are responsible for "electrocatalytic" properties of carbon nanotubes. This is demonstrated in an example of double-walled carbon nanotubes (DWCNTs) containing cobalt residual catalyst nanoparticle impurities, which themselves contain iron-based impurities. It was found that iron-based im- purities within Co residual nanoparticles present in DWCNTs are responsible for the electrochemical reduction of hydrogen peroxide. The chemical states of metallic impurities were investigated by high-resolution X-ray photoelectron spectroscopy.

Original languageEnglish
Pages (from-to)554-560
Number of pages7
JournalChemistry - An Asian Journal
Volume4
Issue number4
DOIs
Publication statusPublished - 2009 Apr 6

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Metal Nanoparticles
Carbon Nanotubes
Impurities
Nanoparticles
Catalysts
Iron
Photoelectron Spectroscopy
Cobalt
Hydrogen Peroxide
Purification
X ray photoelectron spectroscopy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry
  • Organic Chemistry

Cite this

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AB - We show that in some cases, the metallic impurities within residual catalyst metallic nanoparticle impurities, which remain in carbon nanotubes from their synthesis even after purification, are responsible for "electrocatalytic" properties of carbon nanotubes. This is demonstrated in an example of double-walled carbon nanotubes (DWCNTs) containing cobalt residual catalyst nanoparticle impurities, which themselves contain iron-based impurities. It was found that iron-based im- purities within Co residual nanoparticles present in DWCNTs are responsible for the electrochemical reduction of hydrogen peroxide. The chemical states of metallic impurities were investigated by high-resolution X-ray photoelectron spectroscopy.

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