Poly(propylene imine) dendrimer and gold nanoparticles as anti-passivating electrode modifiers in phenol sensing - A case study of 4-chorophenol

T. Ndlovu, O. A. Arotiba

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The electro-oxidation of phenols usually causes electrode passivation which results in drastic reduction of peak currents in subsequent scans. Electrode modifiers may help improve the peak current of phenolic compounds without the need to polish the electrode surface. The effect of electrode modification was therefore investigated on a fabricated exfoliated graphite (EG) electrode using different nano-materials such as poly(propylene imine) dendrimer, gold, cobalt oxide and bismuth nanoparticles. 4-Chlorophenol (a model phenolic compound) passivated the bare EG electrode such that the phenolic peak (at about 0.670 V) was 88.8% lower for the second scan compared to the first scan. The modified electrodes showed some anti-passivating properties with minimum reduction of peak current on the second and subsequent scans. Poly(propylene imine) dendrimer and gold nanoparticle modified EG electrodes exhibited the best anti-passivating properties.

Original languageEnglish
Pages (from-to)8224-8235
Number of pages12
JournalInternational Journal of Electrochemical Science
Volume10
Issue number10
Publication statusPublished - 2015

Keywords

  • Chlorophenol
  • Exfoliated graphite
  • Gold nanoparticles
  • Passivation
  • Phenols
  • Poly(propylene imine) dendrimer

ASJC Scopus subject areas

  • Electrochemistry

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