TY - JOUR
T1 - High temperature electrolyte supported Ni-GDC/YSZ/LSM SOFC operation on two-stage Viking gasifier product gas
AU - Hofmann, P.
AU - Schweiger, A.
AU - Fryda, L.
AU - Panopoulos, K.D.
AU - Hohenwarter, U.
AU - Bentzen, Jens Dall
AU - Ouweltjes, J.P.
AU - Ahrenfeldt, Jesper
AU - Henriksen, Ulrik Birk
AU - Kakaras, E.
PY - 2007
Y1 - 2007
N2 - This paper presents the results from a 150 h test of a commercial high temperature single planar solid oxide fuel cell (SOFC) operating on wood gas from the Viking two-stage fixed-bed downdraft gasifier, which produces an almost tar-free gas, that was further cleaned for particulates, sulphur and tar traces. The chosen SOFC was electrolyte supported with a nickel/gadolinium-doped cerium oxide (Ni-GDC) anode, known for its carbon deposition resistance. Through humidification the steam to carbon ratio (S/C) was adjusted to 0.5, which results in a thermodynamically carbon free condition at the SOFC operating temperature T = 850 degrees C. The cell operated with a fuel utilisation factor (U-f) around 30% and a current density of 260 mA cm(-2) resulting in an average power density of 207 mW cm(-2). Throughout the duration of the test, only a minor cell overpotential increase of 10 mV was observed. Nevertheless, the V-j (voltage-current density) curves on H-2/N-2 before and after the wood gas test proved identical. Extensive SEM/EDS examination of the cell's anode showed that there was neither carbon deposition nor significant shifts in the anode microstructure or contamination when compared to an identical cell tested on H-2/N-2 only.
AB - This paper presents the results from a 150 h test of a commercial high temperature single planar solid oxide fuel cell (SOFC) operating on wood gas from the Viking two-stage fixed-bed downdraft gasifier, which produces an almost tar-free gas, that was further cleaned for particulates, sulphur and tar traces. The chosen SOFC was electrolyte supported with a nickel/gadolinium-doped cerium oxide (Ni-GDC) anode, known for its carbon deposition resistance. Through humidification the steam to carbon ratio (S/C) was adjusted to 0.5, which results in a thermodynamically carbon free condition at the SOFC operating temperature T = 850 degrees C. The cell operated with a fuel utilisation factor (U-f) around 30% and a current density of 260 mA cm(-2) resulting in an average power density of 207 mW cm(-2). Throughout the duration of the test, only a minor cell overpotential increase of 10 mV was observed. Nevertheless, the V-j (voltage-current density) curves on H-2/N-2 before and after the wood gas test proved identical. Extensive SEM/EDS examination of the cell's anode showed that there was neither carbon deposition nor significant shifts in the anode microstructure or contamination when compared to an identical cell tested on H-2/N-2 only.
KW - wood gas
KW - solid oxide fuel cell
KW - biomass
KW - nickel gadolinium-doped ceria oxide
KW - two-stage gasification
U2 - 10.1016/j.jpowsour.2007.04.073
DO - 10.1016/j.jpowsour.2007.04.073
M3 - Journal article
VL - 173
SP - 357
EP - 366
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
IS - 1
ER -