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 language | English |
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Pages (from-to) | 8224-8235 |
Number of pages | 12 |
Journal | International Journal of Electrochemical Science |
Volume | 10 |
Issue number | 10 |
Publication status | Published - 2015 |
Keywords
- Chlorophenol
- Exfoliated graphite
- Gold nanoparticles
- Passivation
- Phenols
- Poly(propylene imine) dendrimer
ASJC Scopus subject areas
- Electrochemistry