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Two different assemblies were developed and tested to study the characteristics of oxygen transport in the gas-phase as a function of the oxygen partial pressure in the flowing gas (nitrogen and oxygen) and the temperature in SOFC reactors. It is found that at high voltages a limiting current is achieved which is almost independent of the gas temperature and proportional to the oxygen partial pressure in the flowing gas. These results can be explained on the basis of a simple diffusion model. Under this assumption, the thickness of the boundary layer for the present experimental conditions is much larger than the electrode thickness (10 µm). Estimates for the concentration polarisation observed in the air electrode of a SOFC, under normal operating conditions, indicate that this component should be negligible (<10mV), assuming high current densities (1A/cm2), and an oxygen consumption up to 90%.

Additional information

Authors: MARQUES F M B, Departamento de Engenharia Ceramica e do Vidro, Aveiro (PT)
Bibliographic Reference: Paper presented: First European Ceramic Society Conference, Maastricht (NL) June 1989
Availability: Available from (1) as Paper EN 34737 ORA
Record Number: 198910648 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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