Overview
ABSTRACT
Ionic oxide ion conductors have many applications (fuel cells, electrochemical separation of oxygen from air, sensors), based on ionic migration through the material. It is the presence of defects that is responsible for their properties. Understanding the mechanisms of diffusion of oxygen comes from thorough knowledge of the structure and parameters of oxygen transport through experimental characterization techniques and modeling studies
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Read the articleAUTHORS
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Aurélie ROLLE: Senior Lecturer - Catalysis and Solid State Chemistry Unit, Solid State Chemistry Team, UMR CNRS 8181, Villeneuve d'Ascq, France
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Vincent THORETON: Doctoral student - Catalysis and Solid State Chemistry Unit, Solid State Chemistry Team, UMR CNRS 8181, Villeneuve d'Ascq, France
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Caroline PIROVANO: Senior Lecturer - Catalysis and Solid State Chemistry Unit, Solid State Chemistry Team, UMR CNRS 8181, Villeneuve d'Ascq, France
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Olivier LAFON: University Professor - Catalysis and Solid State Chemistry Unit, Solid State Chemistry Team, UMR CNRS 8181, Villeneuve d'Ascq, France
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Rose-Noëlle VANNIER: University Professor - Catalysis and Solid State Chemistry Unit, Solid State Chemistry Team, UMR CNRS 8181, Villeneuve d'Ascq, France
INTRODUCTION
Oxide ionic conductors O 2– have many applications, as electrolyte materials for solid oxide fuel cells (electrochemical systems for power generation), as membranes for the electrochemical separation of oxygen from air (enabling the production of high-purity oxygen) or as membranes in gas sensors (e.g. oxygen gauges for quantifying the amount of oxygen in a medium). These applications rely on the migration of oxide ions through the structure of the material itself, the properties being directly linked to the existence of atomic defects (interstitial oxygen atoms, oxygen vacancies, etc.).
In the search for new ionically conductive materials and in understanding oxygen transport mechanisms, a good knowledge of materials, their structure and properties is essential. Following a definition of ionic conduction in solids and its applications, this article reviews the main characterization techniques used to study oxide ion conductors. Reference will also be made to atomic modeling, which relies on simple but sufficient models to help understand transport mechanisms in these materials.
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KEYWORDS
energy | materials | solid state chemistry | characterisation techniques
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Physics and chemistry
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