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Towards understanding surface chemistry and electrochemistry of La0.1Sr0.9TiO3-α based solid oxide fuel cell anodes

Yurkiv, Vitaliy and Constantin, Guillaume and Hornes, Aitor and Gondolini, Angela and Mercadelli, Elisa and Sanson, Alessandra and Dessemond, Laurent and Costa, Rémi (2015) Towards understanding surface chemistry and electrochemistry of La0.1Sr0.9TiO3-α based solid oxide fuel cell anodes. Journal of Power Sources, 287, pp. 58-67. Elsevier. doi: 10.1016/j.jpowsour.2015.04.039. ISSN 0378-7753.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0378775315006783#


In the present contribution, we combine modeling and experimental study of electrochemical hydrogen oxidation at an alternative perovskite based mixed-conducting SOFC anode. Composite electrodes were produced by conventional wet ceramic processing (screen printing – spraying) and sintering on YSZ electrolytes (La0.1Sr0.9TiO3-α-Ce1-xGdxO2-α|YSZ) with different compositions and microstructure, and were electrochemically characterized using symmetrical button-cells configuration. An elementary kinetic model was developed and applied to explore the performance of LST based SOFC anode. A detailed multi-step heterogeneous chemical and electrochemical reaction mechanism was established taking into account transport of ions in all ionic phases, and gas transport in channel and porous media. It was found that heterogeneous chemistry at LST surface has capacitive behavior that alters the impedance spectra. In addition, surface charge-transfer reaction, which describes partial oxygen ionization, caused impedance feature and is rate-limiting at high temperature. The gas transport in the supply chamber (gas conversion) is significant only at moderate temperatures.

Item URL in elib:https://elib.dlr.de/95953/
Document Type:Article
Title:Towards understanding surface chemistry and electrochemistry of La0.1Sr0.9TiO3-α based solid oxide fuel cell anodes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Yurkiv, Vitaliyvitaliy.yurkiv (at) dlr.deUNSPECIFIED
Constantin, GuillaumeUniversité Grenoble AlpesUNSPECIFIED
Hornes, Aitoraitor.hornesmartinez (at) dlr.deUNSPECIFIED
Dessemond, LaurentUniversité Grenoble AlpesUNSPECIFIED
Costa, Rémiremi.costa (at) dlr.deUNSPECIFIED
Date:August 2015
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2015.04.039
Page Range:pp. 58-67
Keywords:Solid oxide fuel cell (SOFC); Perovskite anode; Impedance spectra; Reaction mechanism; Elementary kinetic modeling
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 > Computational Electrochemistry
Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Yurkiv, Vitaliy
Deposited On:15 Apr 2015 13:28
Last Modified:20 Jun 2021 15:46

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