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Evaluation of apatite silicates as solid oxide fuel cell electrolytes
Ist Teil von
Journal of power sources, 2010-05, Vol.195 (9), p.2496-2506
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2010
Link zum Volltext
Quelle
ScienceDirect
Beschreibungen/Notizen
Apatite-type silicates have been considered as promising electrolytes for Solid Oxide Fuel Cells (SOFC); however studies on the potential use of these materials in SOFC devices have received relatively little attention. The lanthanum silicate with composition La
10Si
5.5Al
0.5O
26.75 has been evaluated as electrolyte with the electrode materials commonly used in SOFC, i.e. manganite, ferrite and cobaltite as cathode materials and NiO-CGO composite, chromium-manganite and Sr
2MgMoO
6 as anode materials. Chemical compatibility, area-specific resistance and fuel cell studies have been performed. X-ray powder diffraction (XRPD) analysis did not reveal any trace of reaction products between the apatite electrolyte and most of the aforementioned electrode materials. However, the area-specific polarisation resistance (ASR) of these electrodes in contact with apatite electrolyte increased significantly with the sintering temperature, indicating reactivity at the electrolyte/electrode interface. On the other hand, the ASR values are significantly improved using a ceria buffer layer between the electrolyte and electrode materials to prevent reactivity. Maximum power densities of 195 and 65
mWcm
−2 were obtained at 850 and 700
°C, respectively in H
2 fuel, using an 1 mm-thick electrolyte, a NiO-Ce
0.8Gd
0.2O
1.9 composite as anode and La
0.6Sr
0.4Co
0.8Fe
0.2O
3−
δ
as cathode materials. This fuel cell was tested for 100
h in 5%H
2–Ar atmosphere showing stable performance.