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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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Koch, Søren
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Publications (4/4 displayed)
- 2017Determination of the Resistance of Cone-Shaped Solid Electrodescitations
- 2017Determination of the Resistance of Cone-Shaped Solid Electrodescitations
- 2016Effects of strong cathodic polarization of the Ni-YSZ interfacecitations
- 2006Electrode activation and passivation of solid oxide fuel cell electrodescitations
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article
Determination of the Resistance of Cone-Shaped Solid Electrodes
Abstract
A cone-shaped electrode pressed into an electrolyte can with advantagebe utilized to characterize the electro-catalytic propertiesof the electrode, because it is less dependent onthe electrode microstructure than e.g. thin porous composite electrodes,and reactions with the electrolyte occurring duringprocessing can be avoided. Newman's formula for current constriction inthe electrolyte is then used to deduce the activecontact area based on the ohmic resistance of the cell, and from thisthesurface specific electro-catalytic activity.However, for electrode materials with low electrical conductivity (likeCe<sub>1-x</sub>Pr<sub>x</sub>O<sub>2-δ</sub>), the resistance of thecell is significantly influenced by the ohmic resistance of the coneelectrode, wherefore it mustbe included. In this work the ohmic resistance of acone is modelled analytically based on simplified geometries. The twoanalytical models only differ by a model specificpre-factor, which is consequently determined by a finite element model.The model was applied to measurements on cones ofCe<sub>1-x</sub>Pr<sub>x</sub>O<sub>2-δ</sub> characterized on an YSZelectrolyte. Conclusively, the finite element model was used to obtain aformula for the resistancefor different cone angles with a small contactarea. This reproduces Newman's formula for a cone angle equal to 90°,i.e.a semi-infinite body.