| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Hjelm, Johan
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (37/37 displayed)
- 2024Unifying the ORR and OER with surface oxygen and extracting their intrinsic activities on platinumcitations
- 2023Tuning Polybenzimidazole-Derived Crosslinked Interpenetrating Network Membranes for Vanadium Redox Flow Batteriescitations
- 2023Tuning Polybenzimidazole-Derived Crosslinked Interpenetrating Network Membranes for Vanadium Redox Flow Batteriescitations
- 2022Leveraging coordination chemistry in the design of bipolar energy storage materials for redox flow batteriescitations
- 2022Leveraging coordination chemistry in the design of bipolar energy storage materials for redox flow batteriescitations
- 2018Noise Phenomena in Electrochemical Impedance Spectroscopy of Polymer Electrolyte Membrane Electrolysis Cellscitations
- 2018Reactivating the Ni-YSZ electrode in solid oxide cells and stacks by infiltrationcitations
- 2017A Physically-Based Equivalent Circuit Model for the Impedance of a LiFePO 4 /Graphite 26650 Cylindrical Cellcitations
- 2017Electrochemical Characterization of a PEMEC Using Impedance Spectroscopycitations
- 2017Carbon deposition and sulfur poisoning during CO 2 electrolysis in nickel-based solid oxide cell electrodescitations
- 2017A Physically-Based Equivalent Circuit Model for the Impedance of a LiFePO4/Graphite 26650 Cylindrical Cellcitations
- 2017Carbon deposition and sulfur poisoning during CO2 electrolysis in nickel-based solid oxide cell electrodescitations
- 2017Chemical and Electrochemical Properties of La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) Thin Films upon Oxygen Reduction and Evolution Reactions
- 2016Electron microscopy investigations of changes in morphology and conductivity of LiFePO4/C electrodescitations
- 2016Electrochemical Characterization of PEMECs Operating at Various Current Densities
- 2016Quantitative review of degradation and lifetime of solid oxide cells and stacks
- 2016Electron microscopy investigations of changes in morphology and conductivity of LiFePO 4 /C electrodescitations
- 2015Carbon Deposition during CO2 Electrolysis in Ni-Based Solid-Oxide-Cell Electrodes
- 2015Carbon Deposition during CO2 Electrolysis in Ni-Based Solid-Oxide-Cell Electrodes
- 2015Kinetic Studies on Ni-YSZ Composite Electrodescitations
- 2014Structural instability and electrical properties in epitaxial Er 2 O 3 -stabilized Bi 2 O 3 thin filmscitations
- 2014Degradation Studies on LiFePO 4 cathode
- 2014Degradation Studies on LiFePO4 cathode
- 2014Impedance of SOFC electrodes: A review and a comprehensive case study on the impedance of LSM:YSZ cathodescitations
- 2014Structural instability and electrical properties in epitaxial Er2O3-stabilized Bi2O3 thin filmscitations
- 2012Durable and Robust Solid Oxide Fuel Cells
- 2012Highly durable anode supported solid oxide fuel cell with an infiltrated cathodecitations
- 2011Manufacturing and characterization of metal-supported solid oxide fuel cellscitations
- 2011Manufacturing and characterization of metal-supported solid oxide fuel cellscitations
- 2011Planar metal-supported SOFC with novel cermet anodecitations
- 2011Planar metal-supported SOFC with novel cermet anodecitations
- 2011A high performance ceria based interdiffusion barrier layer prepared by spin-coatingcitations
- 2009Development of Planar Metal Supported SOFC with Novel Cermet Anodecitations
- 2009Development of Planar Metal Supported SOFC with Novel Cermet Anodecitations
- 2008Photochromism and electrochemistry of a dithienylcyclopentene electroactive polymercitations
- 2008Photochromism and electrochemistry of a dithienylcyclopentene electroactive polymercitations
- 2007Electrochemical Impedance Studies of SOFC Cathodescitations
Places of action
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document
Chemical and Electrochemical Properties of La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) Thin Films upon Oxygen Reduction and Evolution Reactions
Abstract
The Oxygen Evolution and Oxygen Reduction Reactions (OER/ORR), occurring at the oxygen electrode of Solid Oxide Cells (SOCs) in the two possible ways of operation, require substantial overpotentials, therefore lowering the operating efficiency of the cells. The reaction mechanisms occurring at these electrodes are still not completely understood due to their complexity and localized character at the interfaces between different materials or between the gas atmosphere and the electrocatalyst, and need in situ techniques with very high chemical sensitivity, with the additional difficulty of probing the materials as close as possible to their realistic operating conditions. In addition, the properties of LSCF are, despite numerous studies, still unclear in many aspects, despite LSCF being one of the state-of-the-art electrocatalysts used for SOCs. It is understood that the surface chemical composition deviates from the nominal bulk composition, and that secondary phases can segregate at the surfaces and interfaces during operation. Furthermore, the electrochemical properties such as Area Specific Resistance (ASR), oxygen exchange coefficient (k<sub>ex</sub>), ASR activation energy (E<sub>a</sub>) and pO<sub>2</sub>exponents for LSCF reported in the literature vary considerably. This study aims to better understand the properties of LSCF, by combining the results of Electrochemical Impedance Spectroscopy (EIS) and Near-Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS) on model electrodes, both in polarized and unpolarized conditions. In particular, NAP-XPS studies of the surface chemistry evolution under operation, as well as the correlation between surface potential changes in relation to the applied overpotential are addressed, in an attempt to determine the real driving force for the oxygen reactions.For this purpose, thin films of LSCF are deposited by Pulsed Laser Deposition (PLD) through shadow masks, in order to obtain well-defined electrode geometries with low risk of contamination, and subsequently tested both in highly clean EIS measuring setups and at the synchrotron beamline. The results of both kinds of experiments are correlated, the goal being a better understanding of the material’s properties under operation, as well as possible degradation phenomena.