Yurkiv, Vitaliy und Costa, Rémi und Ilhan, Zeynep und Ansar, Asif und Bessler, Wolfgang (2014) Impedance of the Surface Double Layer of LSCF/CGO Composite Cathodes: An Elementary Kinetic Model. Journal of The Electrochemical Society, 161 (4), F480-F492. Electrochemical Society, Inc.. doi: 10.1149/2.070404jes. ISSN 0013-4651.
![]() |
PDF
- Nur DLR-intern zugänglich
1MB |
Offizielle URL: http://jes.ecsdl.org/cgi/doi/10.1149/2.070404jes
Kurzfassung
We present a combined modeling and experimental study of electrochemical oxygen reduction at mixed-conducting composite LSCF/CGO solid oxide fuel cell (SOFC) cathodes. The developed kinetic model incorporates elementary heterogeneous chemistry and electrochemical charge-transfer processes at two different electrochemical double layers, transport in the porous composite electrode (ionic and electronic conduction, multi-component porous diffusion and convection) as well as gas supply. A full set of thermodynamic and kinetic parameters is developed. Experimentally, La0.6Sr0.4Co0.8Fe0.2O3-δ/Ce0.9Gd0.1O2-α composite electrodes embedded into a symmetrical cell with CGO electrolyte were characterized via electrochemical impedance spectroscopy. The model shows good agreement with experimental impedance data over the complete range of investigated conditions (temperature range 775 K–1075 K, frequency range 10 mHz–100 kHz). This allows a mechanistic interpretation of the origin of the three observed impedance features: (i) low frequency: transport in the gas supply (gas conversion), (ii) intermediate frequency: charge transfer and surface double layer at the LSCF/air interface, (iii) high frequency: charge transfer and electrical double layer at the LSCF/CGO interface.
elib-URL des Eintrags: | https://elib.dlr.de/90456/ | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||
Titel: | Impedance of the Surface Double Layer of LSCF/CGO Composite Cathodes: An Elementary Kinetic Model | ||||||||||||||||||||||||
Autoren: |
| ||||||||||||||||||||||||
Datum: | 12 Februar 2014 | ||||||||||||||||||||||||
Erschienen in: | Journal of The Electrochemical Society | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||
Band: | 161 | ||||||||||||||||||||||||
DOI: | 10.1149/2.070404jes | ||||||||||||||||||||||||
Seitenbereich: | F480-F492 | ||||||||||||||||||||||||
Verlag: | Electrochemical Society, Inc. | ||||||||||||||||||||||||
ISSN: | 0013-4651 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | Solid oxide fuel cell (SOFC), Cathode, Oxygen reduction, LSCF, elementary kinetics, modeling, simulation, validation. | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||||||||||
HGF - Programm: | Rationelle Energieumwandlung und Nutzung (alt) | ||||||||||||||||||||||||
HGF - Programmthema: | Brennstoffzelle (alt) | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | E EV - Energieverfahrenstechnik | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Elektrochemische Prozesse (alt) | ||||||||||||||||||||||||
Standort: | Stuttgart | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Technische Thermodynamik > Computergestützte Elektrochemie | ||||||||||||||||||||||||
Hinterlegt von: | Yurkiv, Vitaliy | ||||||||||||||||||||||||
Hinterlegt am: | 09 Sep 2014 13:39 | ||||||||||||||||||||||||
Letzte Änderung: | 29 Nov 2023 12:14 |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags