INVESTIGADORES
MOGNI Liliana Veronica
congresos y reuniones científicas
Título:
Validation and Electrochemical Properties of Nd2NiO4+d as SOFCs Cathode with YSZ and GDC electrolytes.
Autor/es:
A. MONTENEGRO HERNÁNDEZ; L. MOGNI; A. CANEIRO
Lugar:
Zaragoza
Reunión:
Congreso; Fuel Cell 2010-Grove Conference; 2010
Institución organizadora:
Elsevier
Resumen:
The Ruddlesden-Popper phase Nd2NiO4+δ is a potential electrode material
for IT-SOFC due to its high oxygen ionic
and p-type electronic conductivities, thermal expansion coefficient (TEC) close to those of most widely used SOFC
electrolytes [1], and its aptitude to accommodate a large oxygen
overstoichiometry [2]. In order to validate the application of this material as
SOFCs cathode, in this work are presented several studies on the chemical and
electrochemical compatibilities between Nd2NiO4+δ and the two most used electrolyte
materials Yttrium Stabilized Zirconia (YSZ) and Gadolinium Doped Ceria (GDC). The
chemical compatibility has been observed by XRD and SEM-EDS experiments, which
show that Nd2NiO4+δ does not react with the electrolyte materials at 900 °C.
This is not the case when La2NiO4+δ was
tested with the similar methods [3]. Symmetrical cells
cathode/electrolyte/cathode have been studied by electrochemical impedance
spectroscopy. The measurements were carried out in the temperature range from
500 to 800 ºC and the pO2 range from 10−3 to 1 atm, for several electrode
thicknesses in order to study the process taking place on cathode/electrolyte
interface and the limiting steps of oxygen reduction mechanisms. The main difference between this work and
those previously reported by other authors [4,5] is that in our case we use Au
mesh as electrical collector. This is because we found high reactivity between
Nd2NiO4+δ and Pt. [1] F. Mauvy, C. Lalanne, J.-M. Bassat, J.-C. Grenier, A.
Brisse, A.-L. Sauvet, C. Barthet, J. Fouletier. Solid State Ionics 180 (2009)
11831189. [2] F. Chauveau, J. Mougin, J.M. Bassat, F. Mauvy, J.C. Grenier,
Journal of Power Sources 195 (2010)
744749. [3] A. Montenegro Hernández, L. Mogni, A. Caneiro, international
Journal of hydrogen energy. In press (
2010). [4] F. Mauvy, C. Lalanne, J.M. Bassat, J.C. Grenier, H. Zhao, P. Dordor,
P. Stevens, Journal of the European Ceramic Society 25 (2005) 26692672. [5] F.
Mauvy, J.-M. Bassat, E. Boehm, J.-P. Manaud, P. Dordor, J.-C. Grenier. Solid
State Ionics 158 (2003) 17 28.