TY - JOUR
T1 - Engineered anode structure for enhanced electrochemical performance of anode-supported planar solid oxide fuel cell
AU - Mukhopadhyay, Madhumita
AU - Mukhopadhyay, Jayanta
AU - Das Sharma, Abhijit
AU - Basu, Rajendra N.
PY - 2012/2
Y1 - 2012/2
N2 - A novel approach of fabricating SOFC anode comprising graded compositions in constituent phases having layer wise microstructural variation is reported. Such anode encompasses conventional NiO-YSZ (40 vol% Ni) with higher porosity at the fuel inlet side and Ni-YSZ electroless cermet (28-32 vol% Ni) with less porosity toward the electrolyte. Microstructures and thicknesses of the bilayer anodes (BLA) are varied sequentially from 50 to 250 μm for better thermal compatibility and cell performance. Significant augmentation in performance (3.5 A cm-2 at 800 °C, 0.7 V) is obtained with engineered trilayer anode (TLA) having conventional anode support in conjunction with layers of electroless cermet each of 50 μm having 28 and 32 vol% Ni. Engineered TLA accounts for substantial reduction both in cell polarization (ohmic ASR: 78 mΩ cm2 versus 2835 mΩ cm2; cell impedance: 0.35 Ω cm2 versus 0.9 Ω cm2) and degradation rate (76 μV h-1 versus 219 μV h-1) compared to cells fabricated with conventional cermet.
AB - A novel approach of fabricating SOFC anode comprising graded compositions in constituent phases having layer wise microstructural variation is reported. Such anode encompasses conventional NiO-YSZ (40 vol% Ni) with higher porosity at the fuel inlet side and Ni-YSZ electroless cermet (28-32 vol% Ni) with less porosity toward the electrolyte. Microstructures and thicknesses of the bilayer anodes (BLA) are varied sequentially from 50 to 250 μm for better thermal compatibility and cell performance. Significant augmentation in performance (3.5 A cm-2 at 800 °C, 0.7 V) is obtained with engineered trilayer anode (TLA) having conventional anode support in conjunction with layers of electroless cermet each of 50 μm having 28 and 32 vol% Ni. Engineered TLA accounts for substantial reduction both in cell polarization (ohmic ASR: 78 mΩ cm2 versus 2835 mΩ cm2; cell impedance: 0.35 Ω cm2 versus 0.9 Ω cm2) and degradation rate (76 μV h-1 versus 219 μV h-1) compared to cells fabricated with conventional cermet.
KW - Cell degradation
KW - Cell polarization
KW - Core-shell electroless anode
KW - High cell performance
KW - Layered SOFC anode
KW - Pore-size distribution
UR - http://www.scopus.com/inward/record.url?scp=84855826169&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2011.10.077
DO - 10.1016/j.ijhydene.2011.10.077
M3 - Article
AN - SCOPUS:84855826169
SN - 0360-3199
VL - 37
SP - 2524
EP - 2534
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 3
ER -
