The high temperature reduction processes for oxygen and water at the catodic interface with an oxygen ion conducting ceramic electrolyte have been reviewed. Different Investigators provided different interpretations for the rate limiting step of the overall reaction, but it seems clear that at temperatures around 1000°C the kinetics does not depend solely on the concentration polarization of the oxygen ion vacancies in the electrolyte, but also by the transport either of the parent or the intermediate species feeding the charge exchange process through the porous structure of metal cathodes. For oxide cathodes the kinetic parameters appear interesting as the reaction rates at these electrodes may be affected not only by the conductivity and transport properties through the electrode material but also by its catalytic activity for the water chemical equilibrium at the cathode surface. Further improvements in the water decomposition rates may be achieved by using oxides of suitable defective structure. The rate of the overall cathodic process is, at any rate, limited by the process of injection of free carriers in the electrolyte. This results in an irreversible alteration (blackening) of the electrolyte with a sharp decay of both the electrical conductivity characteristics and mechanical properties. © 1981.

Barbi, G., Mari, C. (1981). The kinetics of the cathodic reactions of oxygen and water at a solid ceramic electrolyte interface at high temperature. MATERIALS CHEMISTRY, 6(1), 35-54 [10.1016/0390-6035(81)90034-1].

The kinetics of the cathodic reactions of oxygen and water at a solid ceramic electrolyte interface at high temperature

MARI, CLAUDIO MARIA
1981

Abstract

The high temperature reduction processes for oxygen and water at the catodic interface with an oxygen ion conducting ceramic electrolyte have been reviewed. Different Investigators provided different interpretations for the rate limiting step of the overall reaction, but it seems clear that at temperatures around 1000°C the kinetics does not depend solely on the concentration polarization of the oxygen ion vacancies in the electrolyte, but also by the transport either of the parent or the intermediate species feeding the charge exchange process through the porous structure of metal cathodes. For oxide cathodes the kinetic parameters appear interesting as the reaction rates at these electrodes may be affected not only by the conductivity and transport properties through the electrode material but also by its catalytic activity for the water chemical equilibrium at the cathode surface. Further improvements in the water decomposition rates may be achieved by using oxides of suitable defective structure. The rate of the overall cathodic process is, at any rate, limited by the process of injection of free carriers in the electrolyte. This results in an irreversible alteration (blackening) of the electrolyte with a sharp decay of both the electrical conductivity characteristics and mechanical properties. © 1981.
Articolo in rivista - Articolo scientifico
Oxygen cathode reaction
English
1981
6
1
35
54
none
Barbi, G., Mari, C. (1981). The kinetics of the cathodic reactions of oxygen and water at a solid ceramic electrolyte interface at high temperature. MATERIALS CHEMISTRY, 6(1), 35-54 [10.1016/0390-6035(81)90034-1].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/45125
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