Study on the Role of the Morphology of SOFC Cathodes
| Autor: | Nicolas Grunbaum, Laurent Dessemond, Marlu César Steil, Leonardo Sant'Ana Gallo |
|---|---|
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | ECS Transactions. 25:2367-2374 |
| ISSN: | 1938-6737 1938-5862 |
| DOI: | 10.1149/1.3205789 |
| Popis: | The role of the morphology of strontium doped lanthanum manganite (LSM) and LSM/yttria stabilized zirconia (YSZ) composite electrodes was studied by using DC polarization measurement and impedance spectroscopy. Different electrodes were tested: single pure LSM with small porosity layer, porous LSM layer over pure LSM layer and LSM-YSZ composite (50wt% YSZ) with a porous LSM layer. Electrochemical properties of these structures were investigated as a function of temperature. Impedance diagrams show that the electrode reaction of pure LSM electrodes could be related to a high frequency contribution attributed to a charge transfer between LSM and YSZ and a low frequency one semicircle related to an oxygen adsorption step. The impedance response of the electrode based on a LSM-YSZ composite could be related to only the high frequency contribution. No electrochemical activation was evidenced in this case. Maximum current density was around -0.1 A.cm-2 for a cathodic overpotential equal to -0.1 V. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|