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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
Published on: May 26, 2019
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Oxide diffusion in innovative SOFC cathode materials
1Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), Ecole Centrale Paris, Grande Voie des Vignes, 92295 Châtenay-Malabry, France.
Faraday Discussions
|November 20, 2014
Summary
Strontium substitution improved oxygen diffusion in Ca(3)Co(4)O(9)+δ materials for solid oxide fuel cells (SOFCs). This enhancement, particularly in oxygen molecule dissociation kinetics, highlights strontium
Area of Science:
- Materials Science
- Electrochemistry
- Solid Oxide Fuel Cells (SOFCs)
Background:
- Investigating novel cathode materials is crucial for advancing solid oxide fuel cell (SOFC) technology.
- Understanding oxide ion diffusion and surface exchange kinetics is key to optimizing SOFC performance.
- Ba(2)Co(9)O(14) and Ca(3)Co(4)O(9)+δ are promising materials for SOFC applications.
Purpose of the Study:
- To study oxide diffusion in Ba(2)Co(9)O(14) and Ca(3)Co(4)O(9)+δ derivatives.
- To evaluate the effect of strontium substitution on the properties of Ca(3)Co(4)O(9)+δ.
- To assess the oxygen molecule dissociation kinetics on these cathode materials.
Main Methods:
- Experimental investigation of oxide diffusion in selected SOFC cathode materials.
- Surface analysis to understand oxidation processes.
- Measurement of surface exchange coefficients to determine oxygen dissociation kinetics.
Main Results:
- Oxygen diffusion was confirmed in Ba(2)Co(9)O(14), but accurate parameters were hindered by surface oxidation.
- Strontium substitution in Ca(3)Co(4)O(9)+δ improved oxygen diffusion, likely by increasing rock salt layer volume.
- Ca(3)Co(4)O(9)+δ derivatives exhibited fast oxygen molecule dissociation kinetics, with surface exchange coefficients increasing with strontium content.
Conclusions:
- Strontium substitution is a viable strategy to enhance oxygen diffusion and surface kinetics in Ca(3)Co(4)O(9)+δ SOFC cathodes.
- The observed fast kinetics suggest a significant role for strontium in the oxygen dissociation mechanism.
- Further research is needed to clarify the surface oxidation issues in Ba(2)Co(9)O(14) for its potential application.
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