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Citation link: https://doi.org/10.26092/elib/367

Publisher DOI: https://doi.org/10.1002/celc.201900805
celc.201900805(2)-1.pdf
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Dynamic Impedance Spectroscopy of Nickel Hexacyanoferrate Thin Films


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Authors: Erinmwingbovo, Collins  
Koster, Dominique  
Brogioli, Doriano  
La Mantia, Fabio  
Abstract: 
Dynamic multi-frequency analysis (DMFA) is capable of acquiring high-quality frequency response of electrochemical systems under non-stationary conditions in a broad range of frequencies. In this work, we used DMFA to study the kinetics of (de-)intercalation of univalent cations (Na+ and K+) in thin films of nickel hexacyanoferrate (NiHCF) during cyclic voltammetry. For this system, the classic stationary electrochemical impedance spectroscopy fails due to the instability of the oxidized form of NiHCF. We are showing that such spectra can be fitted with a physical model described by a simple two-step intercalation mechanism: an adsorption step followed by an insertion step. The extracted kinetic parameters are depending on the state of charge as well on the nature of the inserted cation.
Keywords: NiHCF thin films; dynamic impedance spectroscopy; dynamic multi-frequency analysis (DMFA); intercalation mechanism; multi-sine excitation
Issue Date: 31-Oct-2019
Project: Electron- and Ion Transfer at the Interface: a Hyphenated Dynamic Multi-Frequency Approach 
Journal: ChemElectroChem 
Start page: 5387
End page: 5395
Note: 21
Band: 6
Pages: 9
Type: Zeitschriftenartikel
ISSN: 2196-0216
DOI: 10.26092/elib/367
URN: urn:nbn:de:gbv:46-elib45705
Institution: Universität Bremen 
Faculty: FB04 Produktionstechnik 
Appears in Collections:Forschungsdokumente

  

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