INVESTIGADORES
MOGNI Liliana Veronica
congresos y reuniones científicas
Título:
Electrochemical characterization of the n = 2 Ruddlesden-Popper Sr3FeMO6+d (M = Fe, Co, Ni) phases by Electrochemical Impedance Spectroscopy
Autor/es:
L. MOGNI; F. PRADO; A. CANEIRO
Lugar:
Chicago, Illinois, USA
Reunión:
Congreso; 211th Electrochemical Society, ECS Meeting; 2007
Institución organizadora:
Electrochemical Society
Resumen:
The electrochemical characterization of the porous electrodes Sr3FeMO6+d (M = Fe, Co, Ni) have been study under O2 atmosphere at intermediate temperature (500- 800 ºC) by AC electrochemical impedance spectroscopy (EIS). A symmetrical cells Sr3FeMO6+d/Ce0.9Gd0.1O2-x/Sr3FeMO6+d have been used.
The porous electrodes have been prepared by spray deposition and they characterization have been performed before and after measurement by X-Ray Diffraction and Scanning Electron Microscopy.
The EIS measurements permit obtain the Area Specific Resistance (ASR), defined by ASR =Z´(w=0)-Z´(wHF, associated with de oxygen reduction reaction in the symmetrical cell. The ASR varies with the Sr3FeNiO6+d = Sr3FeCoO6+d > Sr3Fe2O6+d series. The activation energy (Ea) of ASR, obtained of the Arrhenius plot (ln(ASR) vs. T-1), varies according to Sr3FeNiO6+d > Sr3FeCoO6+d =Sr3Fe2O6+d, taking values between 0.9-1.3 eV.
