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

Maria Al-Hajji-Safi, Andrea Bourke, D. Noel Buckley, Robert P. Lynch

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    3 Citations (Scopus)

    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.

    Original languageEnglish
    Title of host publicationSelected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
    PublisherElectrochemical Society, Inc.
    Pages117-128
    Number of pages12
    Edition11
    ISBN (Electronic)9781607688174
    ISBN (Print)9781623324605
    DOIs
    Publication statusPublished - 2017
    Event231st ECS Meeting - New Orleans, United States
    Duration: 28 May 201701 Jun 2017

    Publication series

    NameECS Transactions
    Number11
    Volume77
    ISSN (Print)1938-6737
    ISSN (Electronic)1938-5862

    Conference

    Conference231st ECS Meeting
    Country/TerritoryUnited States
    CityNew Orleans
    Period28/05/201701/06/2017

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