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Formulations of LSFN and LSCN as fuel electrode materials for high temperature co-electrolysis cells

Amaya D., Diana M. and Sata, Noriko and Han, Feng and Schiller, Günter and Costa, Rémi and Friedrich, K. Andreas (2018) Formulations of LSFN and LSCN as fuel electrode materials for high temperature co-electrolysis cells. Electroceramics XVI, 9.-12.Juli.2018, Hasselt, Belgien.

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Abstract

The efficient utilization of CO2 and its conversion into CO has received great interest since it is considered a suitable path for decarbonisation of human activity and a promising climate protection measure. Solid Oxide Electrolysis Cells (SOECs) offer a single step conversion by electrolysing simultaneously H2O and CO2 to obtain syngas (H2 + CO). This can subsequently be used as feedstock in the Fischer – Tropsch process to yield liquid synthetic fuels. In contrast to the syngas obtained by steam reforming of methane, high temperature co-electrolysis is advantageous since it enables fuel production without consuming non-renewable fossil fuels. In addition, SOEC operation at high temperatures, favours electrode reaction kinetics and decreases the electrolyte resistance, thereby decreasing the required electrical energy for co-electrolysis. State-of-the-art Ni-based cermets have been widely studied as fuel electrode materials due to their high catalytic properties towards H2O/CO2 splitting, as well as for their high electrical conductivity. However, they are susceptible to impurities and irreversible degradation in operation, e.g. by nickel depletion in the functional fuel electrode at high over-potential, as one of several effects. Therefore, further investigations are needed in order to propose mitigation strategies based on detailed understanding of degradation mechanisms. As an alternative, Perovskite-based oxides are promising electrode materials for SOECs due to their catalytic activity and stability in dual atmospheres, besides of being potentially resistant towards migration phenomena. With the aim to implement perovskite-based materials for the fuel electrode of a SOEC, lanthanum-transition-metal perovskites were investigated: (La0.6-x Sr0.4) Fe0.8Ni0.2O3 and (La0.7-x Sr0.3)Cr0.85Ni0.15O3. These precursors were produced by soft chemistry methods by varying their A-site deficiency stoichiometry. Particle morphologies were characterized by SEM and formation of crystalline phases were corroborated by XRD and TGA. Results are presented and discussed with the perspective of SOEC application.

Item URL in elib:https://elib.dlr.de/122758/
Document Type:Conference or Workshop Item (Speech)
Title:Formulations of LSFN and LSCN as fuel electrode materials for high temperature co-electrolysis cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Amaya D., Diana M.Diana.AmayaDuenas (at) dlr.deUNSPECIFIED
Sata, NorikoNoriko.Sata (at) dlr.deUNSPECIFIED
Han, FengFeng.Han (at) dlr.dehttps://orcid.org/0000-0003-1904-134X
Schiller, Günterguenter.schiller (at) dlr.deUNSPECIFIED
Costa, Rémiremi.costa (at) dlr.dehttps://orcid.org/0000-0002-3534-1935
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:9 July 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Perovskite, A-site deficiency, fuel electrode, SOEC, co-electrolysis, CO2 conversion
Event Title:Electroceramics XVI
Event Location:Hasselt, Belgien
Event Type:international Conference
Event Dates:9.-12.Juli.2018
Organizer:Hasselt University, Belgium
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Amaya Duenas, Diana Maria
Deposited On:19 Nov 2018 15:57
Last Modified:19 Nov 2018 15:57

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