Electrochemical purification of carbon nanotube electrodes

Aránzazu Heras, Alvaro Colina, Jesús López-Palacios, Paola Ayala, Jani Sainio, Virginia Ruiz (Corresponding Author), Esko I. Kauppinen

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

We present a fast and effective electrochemical method to purify random networks of single-walled carbon nanotubes (SWCNTs) that leads to total removal of metal catalyst without apparent detrimental effect on the electrochemical properties of the electrodes. The efficiency of the electrochemical purification has been compared with that of conventional chemical purification (acid washing). The disappearance of the peaks corresponding to the electrochemical redox reactions of iron during electrochemical purification evidences removal of iron impurities. The efficiency of electrochemical cleaning is further corroborated by cyclic voltammetry (CV) of an iron-sensitive electrochemical reaction, hydrazine oxidation. X-ray photoelectron spectroscopy also indicates that no iron can be detected after electrochemical purification whereas some iron is still left after acid washing. Moreover, Raman spectroscopy reveals higher degree of SWCNT damage after chemical purification compared to the electrochemical one. Electrochemically purified and pristine SWCNT electrodes exhibit similar conductivity, electrochemistry and performance as optically transparent electrodes for an iron-insensitive redox probe, Ru(bipy)3+=2+3 .
Original languageEnglish
Pages (from-to)1535-1538
JournalElectrochemistry Communications
Volume11
Issue number7
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Carbon Nanotubes
Purification
Carbon nanotubes
Iron
Electrodes
Single-walled carbon nanotubes (SWCN)
hydrazine
Washing
Acids
Redox reactions
Hydrazine
Electrochemistry
Electrochemical properties
Cyclic voltammetry
Raman spectroscopy
Cleaning
X ray photoelectron spectroscopy
Metals
Impurities
Oxidation

Keywords

  • single-walled carbon nanotubes
  • nanotubes
  • electrochemical purification
  • optically transparent electrodes
  • electrodes
  • spectroelectrochemistry

Cite this

Heras, A., Colina, A., López-Palacios, J., Ayala, P., Sainio, J., Ruiz, V., & Kauppinen, E. I. (2009). Electrochemical purification of carbon nanotube electrodes. Electrochemistry Communications, 11(7), 1535-1538. https://doi.org/10.1016/j.elecom.2009.05.052
Heras, Aránzazu ; Colina, Alvaro ; López-Palacios, Jesús ; Ayala, Paola ; Sainio, Jani ; Ruiz, Virginia ; Kauppinen, Esko I. / Electrochemical purification of carbon nanotube electrodes. In: Electrochemistry Communications. 2009 ; Vol. 11, No. 7. pp. 1535-1538.
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Heras, A, Colina, A, López-Palacios, J, Ayala, P, Sainio, J, Ruiz, V & Kauppinen, EI 2009, 'Electrochemical purification of carbon nanotube electrodes', Electrochemistry Communications, vol. 11, no. 7, pp. 1535-1538. https://doi.org/10.1016/j.elecom.2009.05.052

Electrochemical purification of carbon nanotube electrodes. / Heras, Aránzazu; Colina, Alvaro; López-Palacios, Jesús; Ayala, Paola; Sainio, Jani; Ruiz, Virginia (Corresponding Author); Kauppinen, Esko I.

In: Electrochemistry Communications, Vol. 11, No. 7, 2009, p. 1535-1538.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Heras, Aránzazu

AU - Colina, Alvaro

AU - López-Palacios, Jesús

AU - Ayala, Paola

AU - Sainio, Jani

AU - Ruiz, Virginia

AU - Kauppinen, Esko I.

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N2 - We present a fast and effective electrochemical method to purify random networks of single-walled carbon nanotubes (SWCNTs) that leads to total removal of metal catalyst without apparent detrimental effect on the electrochemical properties of the electrodes. The efficiency of the electrochemical purification has been compared with that of conventional chemical purification (acid washing). The disappearance of the peaks corresponding to the electrochemical redox reactions of iron during electrochemical purification evidences removal of iron impurities. The efficiency of electrochemical cleaning is further corroborated by cyclic voltammetry (CV) of an iron-sensitive electrochemical reaction, hydrazine oxidation. X-ray photoelectron spectroscopy also indicates that no iron can be detected after electrochemical purification whereas some iron is still left after acid washing. Moreover, Raman spectroscopy reveals higher degree of SWCNT damage after chemical purification compared to the electrochemical one. Electrochemically purified and pristine SWCNT electrodes exhibit similar conductivity, electrochemistry and performance as optically transparent electrodes for an iron-insensitive redox probe, Ru(bipy)3+=2+3 .

AB - We present a fast and effective electrochemical method to purify random networks of single-walled carbon nanotubes (SWCNTs) that leads to total removal of metal catalyst without apparent detrimental effect on the electrochemical properties of the electrodes. The efficiency of the electrochemical purification has been compared with that of conventional chemical purification (acid washing). The disappearance of the peaks corresponding to the electrochemical redox reactions of iron during electrochemical purification evidences removal of iron impurities. The efficiency of electrochemical cleaning is further corroborated by cyclic voltammetry (CV) of an iron-sensitive electrochemical reaction, hydrazine oxidation. X-ray photoelectron spectroscopy also indicates that no iron can be detected after electrochemical purification whereas some iron is still left after acid washing. Moreover, Raman spectroscopy reveals higher degree of SWCNT damage after chemical purification compared to the electrochemical one. Electrochemically purified and pristine SWCNT electrodes exhibit similar conductivity, electrochemistry and performance as optically transparent electrodes for an iron-insensitive redox probe, Ru(bipy)3+=2+3 .

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Heras A, Colina A, López-Palacios J, Ayala P, Sainio J, Ruiz V et al. Electrochemical purification of carbon nanotube electrodes. Electrochemistry Communications. 2009;11(7):1535-1538. https://doi.org/10.1016/j.elecom.2009.05.052