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Deconvolution of Gas Diffusion Polarization in Ni/Gadolinium-Doped Ceria Fuel Electrodes

Grosselindemann, C. ORCID iD icon; Russner, N.; Dierickx, S.; Wankmüller, F.; Weber, A. ORCID iD icon

Abstract:

The deconvolution of physicochemical processes in impedance spectra of SOCs with nickel/ceria fuel electrodes is challenging as gas diffusion strongly overlaps with the electrochemical processes at fuel and air electrode. To overcome this issue, symmetrical cells were applied and the gas diffusion process at the fuel electrode was quantified by altering the inert component (nitrogen/helium) in a ternary fuel gas mixture. An effective gas transport parameter considering microstructural and geometrical features was derived, enabling a precise quantification of polarization resistances related to gas diffusion and hydrogen electrooxidation. The obtained values were applied to parameterize a dc cell model. The model validation in fuel cell and electrolyzer mode showed an excellent agreement between measured and simulated current/voltage characteristics over a wide range of technically meaningful gas compositions and operating temperatures.


Postprint §
DOI: 10.5445/IR/1000142076
Veröffentlicht am 04.04.2022
Originalveröffentlichung
DOI: 10.1149/1945-7111/ac3d02
Scopus
Zitationen: 24
Web of Science
Zitationen: 27
Dimensions
Zitationen: 28
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Laboratorium für Elektronenmikroskopie (LEM)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2021
Sprache Englisch
Identifikator ISSN: 0013-4651, 1945-7111
KITopen-ID: 1000142076
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in Journal of the Electrochemical Society
Verlag Electrochemical Society
Band 168
Heft 12
Seiten Art.-Nr.: 124506
Projektinformation KOSOS (BMWK, 03ETB005E)
Vorab online veröffentlicht am 18.12.2021
Nachgewiesen in Web of Science
Scopus
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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