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Understanding electro-catalysis to design perovskite based electrodes for Solid Oxide Cells

Costa, Rémi and Amaya Duenas, Diana Maria and Han, Feng and Riegraf, Matthias (2018) Understanding electro-catalysis to design perovskite based electrodes for Solid Oxide Cells. ECERSXVI, 9.-13. Juli 2018, Hasselt, Belgien.

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Abstract

The traditional approach to enhance the performance of Solid Oxide Cells (SOC)relies on the functional materials with improved properties, such as enhanced electro-catalytic activity and optimized microstructure. Perovskite based Mixed Ionic and Electronic Conductors (MIEC) change the paradigm of the active sites in SOC electrodes by offering double phase boundaries (DBs) in addition to triple phase boundaries (TPBs). For instance, compounds from the (LaxSr1-x)1-yCo1-zFezO3-δ (LSCF) improved functionality of the air electrode, via a higher ionic conductivity, while compounds from the LaxSr1-xTiO3-δ (LST) due to dimensional stability in both reducing and oxidizing conditions significantly enhance tolerance of the fuel electrode towards redox cycles. Ce1-xGdxO2-α (CGO) itself present a significant MIEC behavior above 600 °C, typical of SOC operation. Hereby, we present the results of studies related to the development of flexible and durable (LaxSr1-x)1-yTiO3-δ (LST) – Ce1-xGdxO2-α (CGO) based fuel electrodes and (LaxSr1-x)1-yCo1-zFezO3-δ (LSCF) – Ce1-xGdxO2-α (CGO) based air electrode. Model electrodes with various phase proportion were produced and electrochemically characterized in relevant atmosphere and at various temperature. The identification of electrochemical processes on the active sites, the understanding of the electrochemical behavior and the identification of the rate limiting processes as a function of the operating temperature will be presented. The results obtained with DBs based electrodes implemented in a metal supported SOC and operated both in fuel cell and electrolysis mode will be presented and critically discussed in terms of performance, durability and tolerance towards poisons. The discussion will be further extended to the use of such materials in other traditional planar cell architectures.

Item URL in elib:https://elib.dlr.de/122631/
Document Type:Conference or Workshop Item (Speech)
Title:Understanding electro-catalysis to design perovskite based electrodes for Solid Oxide Cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costa, Rémiremi.costa (at) dlr.dehttps://orcid.org/0000-0002-3534-1935
Amaya Duenas, Diana MariaDiana.AmayaDuenas (at) dlr.deUNSPECIFIED
Han, FengFeng.Han (at) dlr.dehttps://orcid.org/0000-0003-1904-134X
Riegraf, Matthiasmatthias.riegraf (at) dlr.dehttps://orcid.org/0000-0002-0383-2545
Date:July 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:perovskite, electrocatalysis, Mixed Ionic and Electronic Conductor, Fuel Cell, Electrolyzer, electroceramics
Event Title:ECERSXVI
Event Location:Hasselt, Belgien
Event Type:international Conference
Event Dates:9.-13. Juli 2018
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Costa, Dr Rémi
Deposited On:19 Nov 2018 15:46
Last Modified:01 Aug 2019 03:00

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