Determination of the exchange current in the SOFC composite cathode |
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| Authors: | A Touati A Hammou |
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| Institution: | (1) Institut Supérieur des Sciences Appliquées et de Technologie de Mateur, Route de Tabarka, 7030 Mateur, Tunisia;(2) Laboratoire d’Electrochimie et de Physicochimie des Matériaux et des Interfaces (LEPMI-INPG,CNRS,UJF) 1130, rue de la Piscine, BP 75, 38402 Saint Martin d’Hères, France |
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| Abstract: | To evaluate the exchange current I
o of the oxygen electrode reaction at the O2 strontium-doped lanthanum manganite (LSM)/yttria stabilized zirconia (YSZ) composite/YSZ interface, the variation of the
current I vs overvoltage η is measured at low cathodic and anodic polarizations (−50 to 30 mV). A linear behavior is observed within this potential
domain with a unique slope. Taking into account of the dissociative adsorption of the oxygen molecule on the LSM electrocatalyst
surface and the charge transferred at the triple-phase boundary, the exchange current is evaluated to 2.93 mA in air at 747 °C. |
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| Keywords: | SOFC Cathode |
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