Dynamic Impedance Spectroscopy of Nickel Hexacyanoferrate Thin Films
Veröffentlichungsdatum
2019-10-31
Zusammenfassung
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.
Schlagwörter
NiHCF thin films
;
dynamic impedance spectroscopy
;
dynamic multi-frequency analysis (DMFA)
;
intercalation mechanism
;
multi-sine excitation
Institution
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Band
6
Heft
21
Startseite
5387
Endseite
5395
Seitenzahl
9
Zweitveröffentlichung
Nein
Sprache
Englisch
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Name
celc.201900805(2)-1.pdf
Size
3.2 MB
Format
Adobe PDF
Checksum
(MD5):8e27e45c617576b5751e3ce5a48ab7c6