Electrochemical and degradation behaviour study of different SOFC compounds
Date
2017-04-07Author
Morán Ruiz, Aroa
Vidal García, Karmele
Larrañaga Varga, Aitor
Rodríguez, Jesús
Laguna-Bercero, Miguel Angel
Campana, Roberto
Metadata
Show full item recordAbstract
The present work is focused on manufacturing processes of the solid oxide fuel cell (SOFC) components with
previously self-synthesized materials by combustion method [1-2]. The configuration used consists of planar
electrolyte-supported symmetric cells, with dense yttria-stabilized zirconia (YSZ) membranes about 20mm
diameter and a thickness near 300μm.
Ni-yttria-stabilized zirconia cermet (Ni-YSZ) [3] and La0.6Sr0.4FeO3 (LSF40) [4] layers were deposited on the
surfaces of the electrolyte as anode and cathode, respectively. In order to decrease the interlayer reactivity and
improve the contact between them, Ce0.8Sm0.2O1.9 (SDC), LaNi0.6Fe0.4O3 (LNF60) and MnCo1.9Fe0.1O4 (MCF10)
were added in different combinations as protection barrier [5], contact layer [6] and protective layer [7] material,
respectively.
The deposition of the different compounds has been carried out by manual colloidal spraying, using an organic
base solution, or by screen printing. Cross section SEM images have been done to study morphologically the
different starting layers. In order to study the degradation of the samples after 500h of exposure time at a
temperature of 800 ºC, the energy-dispersive X-ray spectroscopy analysis of the cross sectional micrographs has
been evaluated. Electrochemical impedance spectroscopy was used to characterize the electrochemical properties
of the different components and multilayer structures.