Effect of electrochemical treatment of glassy carbon electrodes on electrode surface and vanadiumlv-vanadiumv kinetics

Al-Hajji-Safi, Maria and Bourke, Andrea and Buckley, D. Noel and Lynch, Robert P. (2017) Effect of electrochemical treatment of glassy carbon electrodes on electrode surface and vanadiumlv-vanadiumv kinetics. In: Selected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017 :. ECS Transactions (11). Electrochemical Society Inc., USA, pp. 117-128. ISBN 9781623324605

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Abstract

The VIV-VV electrode kinetics of polished and non-polished glassy carbon electrodes were monitored during repeated cathodic and anodic treated. Although anodic treatment initially enhances the electrode kinetics, repeated treatment leads to the reverse: i.e. the kinetics is inhibited by anodic treatment and enhanced by cathodic treatment. The kinetics of the system was investigated using cyclic voltammetry (CV) and impedance spectroscopy (EIS) and the two techniques show strong agreement. The enhancement factor between the activated (i.e. cathodically treated) and deactivated (i.e. anodically treated) electrodes was as high as 11.5. Scanning electron microscopy (SEM) shows that the electrode surface is stable with only limited cracking. CV analysis in sulfuric acid shows very stable values for current density on anodically treated electrodes but a proportional relationship between current density and treatment number on cathodically treated electrodes suggesting functionalization of the system through repeated reduction and oxidation of the electrodes. These functionalized sites may be easily reduced or oxidized allowing toggling between the activated and deactivated states of VIV-VV electrode kinetics.

Item Type:	Book Section
Additional Information:	Publisher Copyright: © 2017 The Electrochemical Society.
Uncontrolled Keywords:	/dk/atira/pure/subjectarea/asjc/2200
Departments or Groups:
Depositing User:	Admin SSL
Date Deposited:	19 Oct 2022 23:16
Last Modified:	27 Jul 2023 00:50
URI:	http://repository-testing.wit.ie/id/eprint/4981

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