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Synthesis and Evaluation of the A–site Deficient Perovskite La0.65Sr0.3Cr0.85Ni0.15O3-δ as Fuel Electrode for High Temperature Co–electrolysis Enhanced by In Situ Exsolution of Ni Nanoparticles

Amaya Duenas, Diana Maria and Chen, Guoxing and Weidenkaff, Anke and Sata, Noriko and Han, Feng and Schiller, Günter and Costa, Rémi and Friedrich, Kaspar Andreas (2019) Synthesis and Evaluation of the A–site Deficient Perovskite La0.65Sr0.3Cr0.85Ni0.15O3-δ as Fuel Electrode for High Temperature Co–electrolysis Enhanced by In Situ Exsolution of Ni Nanoparticles. 16th International Symposium on Solid Oxide Fuel Cells (SOFC-XVI), 08-13. Sep, 2019, Kyoto, Japan.

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Abstract

In this work, we focused on the lanthanum strontium chromite (LSC) matrix with the purpose to partially substitute the B-site with an electrocatalytic reducible transition metal that could be exsolved in situ. Therefore, nickel was considered at a substitution level of 15%. In addition, an A-site deficiency was formulated in order to enhance the exsolution capability of the electrocatalyst. A precursor was synthesized by wet-chemical method and further calcined in air. Single phase was obtained with the formulation La0.65Sr0.3Cr0.85Ni0.15O3-δ (L65SCN) which was characterized by X–ray diffraction (XRD) and Rietveld refinement analyses. Exsolution was investigated by means of thermogravimetric analysis (TGA) under reducing conditions and temperature-programmed reduction (TPR). Scanning electron microscopy (SEM) was used to study the particle morphology and its evolution. Ni particle exsolution was observed after exposure to a reducing atmosphere. The behaviour of the L65SCN perovskite was compared with the stoichiometric La0.70Sr0.3Cr0.85Ni0.15O3-δ (L70SCN). Aiming at evaluating the electrochemical performance, electrolyte-supported cells were manufactured by screen printing and sintering of composite L65SCN/CGO as fuel electrode and La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) as air electrode on CGO-3YSZ-CGO substrates. The produced cells were tested in electrolysis and co–electrolysis mode and characterized by means of Electrochemical Impedance Spectroscopy (EIS) and polarization curves. Results will be presented with the perspective of SOEC applications.

Item URL in elib:https://elib.dlr.de/129825/
Document Type:Conference or Workshop Item (Speech)
Title:Synthesis and Evaluation of the A–site Deficient Perovskite La0.65Sr0.3Cr0.85Ni0.15O3-δ as Fuel Electrode for High Temperature Co–electrolysis Enhanced by In Situ Exsolution of Ni Nanoparticles
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Amaya Duenas, Diana MariaDiana.AmayaDuenas (at) dlr.deUNSPECIFIED
Chen, GuoxingInstitute of Materials and Earth Sciences Technische Universität DarmstadtUNSPECIFIED
Weidenkaff, AnkeInstitute of Materials and Earth Sciences Technische Universität DarmstadtUNSPECIFIED
Sata, NorikoNoriko.Sata (at) dlr.deUNSPECIFIED
Han, FengFeng.Han (at) dlr.dehttps://orcid.org/0000-0003-1904-134X
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625
Costa, Rémiremi.costa (at) dlr.dehttps://orcid.org/0000-0002-3534-1935
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deUNSPECIFIED
Date:12 October 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:perovskite, A–site deficiency, fuel electrode, exsolution, co–electrolysis
Event Title:16th International Symposium on Solid Oxide Fuel Cells (SOFC-XVI)
Event Location:Kyoto, Japan
Event Type:international Conference
Event Dates:08-13. Sep, 2019
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:16 Dec 2019 13:20
Last Modified:27 Apr 2020 14:36

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