Journal article
Electrochemical Mechanism of Ferrocene-Based Redox Molecules in Thin Film Membrane Electrodes
Electrochimica Acta, Vol.238, pp.357-367
2017
Abstract
Cyclic voltammetry (CV) in chloride-based aqueous electrolytes of ferrocene molecule doped thin membranes ( 200 nm in thickness) on glassy carbon (GC) substrate electrodes, both plasticized poly (vinyl chloride) (PVC) and unplasticized poly(methyl methacrylate)/poly(decyl methacrylate) (PMMA-PDMA) membranes, has shown that the electrochemical oxidation behavior is irreversible due most likely to degradation of ferrocene at the buried interface (GC|membrane). Furthermore, CV of the ferrocene molecules at GC electrodes in organic solvents employing chloride-based and chloride-free organic electrolytes has demonstrated that the chloride anion is inextricably linked to this irreversible ferrocene oxidation electrochemistry. Accordingly, we have explored the electrochemical oxidation mechanism of ferrocene-based redox molecules in thin film plasticized and unplasticized polymeric membrane electrodes by coupling synchrotron radiation-X-ray photoelectron spectroscopy (SR-XPS) and near edge X-ray absorption fine structure (NEXAFS) with argon ion sputtering to depth profile the electrochemically oxidized thin membrane systems. With the PVC depth profiling studies, it was not possible to precisely study the influence of chloride on the ferrocene reactivity due to the high atomic ratio of chloride in the PVC membrane; however, the depth profiling results obtained with a chlorine-free polymer (PMMA-PDMA) provided irrefutable evidence for the formation of a chloride-based iron product at the GC|PMMA-PDMA interface. Finally, we have identified conditions that prevent the irreversible conversion of ferrocene by utilizing a high loading of redox active reagent and/or an ionic liquid (IL) membrane plasticizer with high ionicity that suppresses the mass transfer of chloride.
Details
- Title
- Electrochemical Mechanism of Ferrocene-Based Redox Molecules in Thin Film Membrane Electrodes
- Authors
- Maria Cuartero (Author) - University of Geneva, SwitzerlandRobert G Acres (Author) - Australian SynchrotronJohn Bradley (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringZdenka Jarolimova (Author) - University of Geneva, SwitzerlandLu Wang (Author) - University of Geneva, SwitzerlandEric Bakker (Author) - University of Geneva, SwitzerlandGaston A Crespo (Author) - University of Geneva, SwitzerlandRoland De Marco (Author) - University of the Sunshine Coast
- Publication details
- Electrochimica Acta, Vol.238, pp.357-367
- Publisher
- Pergamon
- Date published
- 2017
- DOI
- 10.1016/j.electacta.2017.04.047
- ISSN
- 0013-4686; 0013-4686
- Copyright note
- Copyright © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Organisation Unit
- University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
- Language
- English
- Record Identifier
- 99451053502621
- Output Type
- Journal article
- Research Statement
- false
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web Of Science research areas
- Electrochemistry