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Combined experimental and modeling study of interaction between LSCF and CGO in SOFC cathodes

Costa, Rémi and Spotorno, Roberto and Repetto, Claudia and Ilhan, Zeynep and Yurkiv, Vitaliy (2014) Combined experimental and modeling study of interaction between LSCF and CGO in SOFC cathodes. 11th European SOFC and SOE Forum 2014, 1.-4. Juli 2014, Luzern, Schweiz.

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The development of a high-performance oxygen electrode for SOFCs in order to achieve high power density at a stack level is still challenging. It is important to emphasize the factors controlling the efficiency of the cathode. Over the intrinsic electro-catalytic activity of the cathode material itself toward the oxygen reduction, the microstructural parameters such as the porosity, the tortuosity or the particle size are of major importance in the definition of the electrochemical active surface area. In this paper we focus on the behavior of La0.6Sr0.4Co0.2Fe0.8O3-α (LSCF)-Ce1-xGdxO2-α (CGO) composite cathodes with different development and characterization of composite cathodes produced by suspension spraying and sintering, with or without further surface modification by infiltration either LSCF or CGO nano-particles. Different symmetrical cells were produced by varying the LSCF/CGO ratio with an active surface area of about 12.57 cm2. Cells were contacted with a fine platinum mesh without any contacting paste and electrochemical impedance spectra (EIS) were recorded in static ambient air in the frequency range 10 mHz – 100 kHz between 500 °C and 800 °C. The serial resistance (Rs) and the total polarization resistance (Rp) were both quantified. The developed kinetic model of oxygen reduction at LSCF/CGO cathode, which incorporates elementary heterogeneous chemistry and electrochemical charge-transfer processes at two different electrochemical double layers, transport in the porous composite electrode, as well as gas supply, is used to explain the non-intuitive interaction between LSCF and CGO phases. This allows a mechanistic interpretation of the origin of different chemical, electrochemical and transport phenomena occurring in composite cathodes.

Item URL in elib:https://elib.dlr.de/91069/
Document Type:Conference or Workshop Item (Poster)
Title:Combined experimental and modeling study of interaction between LSCF and CGO in SOFC cathodes
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costa, Rémiremi.costa (at) dlr.deUNSPECIFIED
Yurkiv, Vitaliyvitaliy.yurkiv (at) dlr.deUNSPECIFIED
Date:July 2014
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:SOFC, Cathode, EIS
Event Title:11th European SOFC and SOE Forum 2014
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:1.-4. Juli 2014
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Costa, Dr Rémi
Deposited On:22 Oct 2014 09:48
Last Modified:31 Jul 2019 19:48

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