INVESTIGADORES
MOGNI Liliana Veronica
congresos y reuniones científicas
Título:
Validation of Nd2NiO4+ δ As Oxygen Electrode Material for Intermediate Temperature Solid Oxide Cells With Lsgm Electrolyte.
Autor/es:
A.MONTENEGRO-HERNANDEZ; L. MOGNI; A. CANEIRO
Lugar:
San Francisco
Reunión:
Congreso; 224th ECS meeting; 2013
Institución organizadora:
Electrochemical Society
Resumen:
The oxygen reduction reaction (ORR) was
studied by Electrochemical Impedance Spectroscopy (EIS) for Nd2NiO4+δ
(NNO) electrodes deposited on La0.9Sr0.1Ga0.8Mg0.2O2.85
(LSGM) electrolyte. The influence of NNO microstructure on
the electrochemical performance was evaluated. The EIS measurements were
carried out as a function of temperature (500<T<750ºC) and oxygen partial pressure (10-4<pO2<1atm).
Three contributions associated with the ORR were
identified: at high (HF), medium (MF) and low frequencies (LF). The HF
contribution was associated with oxygen ion transfer trough
electrode/electrolyte interphase. The MF contribution was attributed to oxygen
ions diffusion within the NNO. The LF contribution was related to O2-dissociative
adsorption for NNO obtained by chemical routes, where the particle sizes are smaller.
If NNO were obtained by Solid State Reaction, the LF element was associated
with a convolution of dissociative adsorption and gas diffusion processes.