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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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Hansen, Karin Vels
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2021Short-term strong cathodic polarization of Ni/YSZ and Pt/YSZ
- 2019Influence of sintering profile on the microstructure and electronic transport properties of Sr(Ti,Nb)O3 tapes for solid oxide cell applications
- 2019Probe electrode study of cathodically polarized PtIr-YSZ interfacescitations
- 2017Dynamic and Impure Perovskite Structured Metal Oxide Surfacescitations
- 2016Effects of strong cathodic polarization of the Ni-YSZ interfacecitations
- 2016New Hypothesis for SOFC Ceramic Oxygen Electrode Mechanismscitations
- 2015Environmental TEM study of the dynamic nanoscaled morphology of NiO/YSZ during reductioncitations
- 2015Need for In Operando Characterization of Electrochemical Interface Features
- 2015Dynamic behavior of impurities and native components in model LSM microelectrodes on YSZcitations
- 2014NiO/YSZ Reduction for SOFC/SOEC Studied In Situ by Environmental Transmission Electron Microscopycitations
- 2014In situ surface reduction of a NiO-YSZ-alumina composite using scanning probe microscopycitations
- 2013Oxygen Electrode Kinetics and Surface Composition of Dense (La0.75Sr0.25)0.95MnO3 on YSZcitations
- 2013Electrochemical reduction of NiO in a composite electrodecitations
- 2013Oxygen Electrode Kinetics and Surface Composition of Dense (La 0.75 Sr 0.25 ) 0.95 MnO 3 on YSZcitations
- 2012Composite Sr- and V-doped LaCrO 3 /YSZ sensor electrode operating at low oxygen levelscitations
- 2012Fundamental Material Properties Underlying Solid Oxide Electrochemistry
- 2012Composite Sr- and V-doped LaCrO3/YSZ sensor electrode operating at low oxygen levelscitations
- 2010Quantitative data analysis methods for 3D microstructure characterization of Solid Oxide Cells
- 2010High Performance Fe-Co Based SOFC Cathodescitations
- 2008Effects of trace elements at the Ni/ScYSZ interface in a model solid oxide fuel cell anodecitations
- 2001Microstructural and chemical changes at the Ni/YSZ interfacecitations
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article
Environmental TEM study of the dynamic nanoscaled morphology of NiO/YSZ during reduction
Abstract
The reduction of a metal oxide is often a critical preparation step for activating catalytic behaviour. This study addresses the reduction process of NiO in pure form and in a composite of NiO/yttria-stabilized zirconia (YSZ) in hydrogen relevant for solid oxide electrochemical cells by comparing results from environmental transmission electron microscopy (ETEM) with thermogravimetric analysis (TGA). The temperature dependent reduction profiles obtained from TGA confirm an inhibitive effect from YSZ on the NiO reduction. The ETEM images show the growth of Ni in decaying NiO and reveal the nanoscale morphological changes such as pore formation in NiO above 280°C and densification and collapse of the pore structures above 400°C. The accelerated Ni front in NiO illustrates the auto catalysis of the reaction. A rapid temperature ramping from room temperature to 780°C in hydrogen in 1 second resulted in immediate morphological changes at the nanoscale from dense NiO to dense Ni. The analysis suggests that the inhibitive effect of YSZ on the NiO reduction reaction is not due to a direct local interaction between YSZ and NiO, but instead due to gas and/or mass transport limitations.© 2014 Elsevier B.V. All rights reserved.