Investigating the voltammetric reduction of methylviologen at gold and carbon based electrode materials. Evidence for a surface bound adsorption mechanism leading to electrode ‘protection’ using multi-walled carbon nanotubes

Xiao, Lei, Wildgoose, Gregory and Compton, Richard G. (2008) Investigating the voltammetric reduction of methylviologen at gold and carbon based electrode materials. Evidence for a surface bound adsorption mechanism leading to electrode ‘protection’ using multi-walled carbon nanotubes. New Journal of Chemistry, 32 (9). p. 1628. ISSN 1369-9261

Full text not available from this repository.

Abstract

Cyclic voltammetry was recorded in an aqueous solution of 1,1'-dimethyl-4,4' bipyridinium dichloride (“methylviologen” or “paraquat”) at a variety of electrode materials namely gold, boron doped diamond (BDD), edge (eppg) and basal plane (bppg) pyrolytic graphite electrode. Previous mechanisms reported in the literature to describe the observed voltammetry are critically assessed and an alternative mechanistic interpretation is presented involving evidence for surface adsorption of intermediate species in the redox behaviour of methylviologen (MV) rather than any disproportionation or comproportionation as was previously claimed for the specific case of gold electrodes. Various electrodes were then modified with multi-walled carbon nanotubes (MWCNTs) where the formation of solid MV0 on the electrode surface was prevented due to preferential adsorption of MV0 on the MWCNTs. Thus coating an electrode with MWCNTs can protect the electrode surface from “fouling”, providing scope for diffusion dominated voltammetry at electrodes where surface inhibition has hitherto dominated.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Rachel Smith
Date Deposited: 29 Mar 2011 16:17
Last Modified: 21 Apr 2020 19:11
URI: https://ueaeprints.uea.ac.uk/id/eprint/27488
DOI: 10.1039/B804842H

Actions (login required)

View Item View Item