Reactivities of Modified and Unmodified Exfoliated Graphite Electrodes in Selected Redox Systems

Ndlovu, T and Arotiba, OA and Sampath, S and Krause, RW and Mamba, BB (2012) Reactivities of Modified and Unmodified Exfoliated Graphite Electrodes in Selected Redox Systems. In: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, 7 (10). pp. 9441-9453.

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Abstract

The electrochemical profiles of exfoliated graphite electrodes (EG) and glassy carbon electrodes (GCE) were recorded using cyclic voltammetry and square wave voltammetry in the presence of various supporting electrolytes and Fe(CN)(6)](3-/4-), Ru(NH3)(6)](2+/3+), ferrocene redox probes. In the supporting electrolytes (KCl, H2SO4, NaOH, tetrabutylammoniumtetraflouroborate, phosphate buffers), the potential windows of EG were found in some cases to be about 200 mV larger than that of GCE. The electroactive surface area of EG was estimated to be 19.5 % larger than the GCE which resulted in higher peak currents on the EG electrode. Furthermore, EG was modified with various nanomaterials such as poly (propylene imine) dendrimer, gold nanoparticles, and dendrimer-gold nanoparticles composite. The morphologies of the modified electrodes were studied using scanning electron microscopy and their electrochemical reactivities in the three redox probes were investigated. The current and the reversibility of redox probes were enhanced with the presence of modifiers in different degrees with dendrimer and gold nanoparticles having a favorable edge.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Publisher:	ELECTROCHEMICAL SCIENCE GROUP
Additional Information:	Copy right for this article belongs to ELECTROCHEMICAL SCIENCE GROUP, SERBIA
Keywords:	Exfoliated graphite electrode;electrode modification;glassy carbon electrode;redox probe;dendrimer;gold nanoparticles
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	07 Feb 2013 09:19
Last Modified:	07 Feb 2013 09:19
URI:	http://eprints.iisc.ac.in/id/eprint/45744

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