TY - GEN
T1 - Effect of infiltration on performance of Ni-YSZ fuel electrodes
AU - Barnett, Scott A.
AU - Park, Beom Kyeong
AU - Scipioni, Roberto
N1 - Funding Information:
The authors gratefully acknowledge research support from the HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office, under Award Number DE-0008079; and the Department of Energy Fossil Energy Division via FuelCell Energy.
Publisher Copyright:
© The Electrochemical Society.
PY - 2019
Y1 - 2019
N2 - Ni-YSZ electrodes for solid oxide cells (SOCs) can have a diverse range of compositions, porosities, and particle sizes - factors that impact electrochemical performance. A typical Ni-YSZ structure in an anode-supported cell fired at 1400oC has feature sizes of ~ 0.5 µm that yield desirably low polarization resistance values < 0.1 Ω cm2 at 800oC in H2-H2O fuel, along with good stability. Decreasing feature size increases three-phase boundary density, thereby reducing polarization resistance and improving low-temperature cell performance. However, the feature size that can be reached in anode-supported cells is limited by the relatively high co-firing temperature. Furthermore, decreased feature sizes can exacerbate coarsening effects that degrade performance. This paper discusses an alternative method for enhancing the low-temperature performance of Ni-YSZ anodes - infiltration of Gd-doped Ceria (GDC). Since GDC is introduced after the high-temperature firing, nano-scale particles can be achieved. A single-step GDC infiltration into Ni-YSZ is studied with different solution concentrations. The optimal infiltration is found to reduce polarization resistance by a factor of 3 times at 600oC.
AB - Ni-YSZ electrodes for solid oxide cells (SOCs) can have a diverse range of compositions, porosities, and particle sizes - factors that impact electrochemical performance. A typical Ni-YSZ structure in an anode-supported cell fired at 1400oC has feature sizes of ~ 0.5 µm that yield desirably low polarization resistance values < 0.1 Ω cm2 at 800oC in H2-H2O fuel, along with good stability. Decreasing feature size increases three-phase boundary density, thereby reducing polarization resistance and improving low-temperature cell performance. However, the feature size that can be reached in anode-supported cells is limited by the relatively high co-firing temperature. Furthermore, decreased feature sizes can exacerbate coarsening effects that degrade performance. This paper discusses an alternative method for enhancing the low-temperature performance of Ni-YSZ anodes - infiltration of Gd-doped Ceria (GDC). Since GDC is introduced after the high-temperature firing, nano-scale particles can be achieved. A single-step GDC infiltration into Ni-YSZ is studied with different solution concentrations. The optimal infiltration is found to reduce polarization resistance by a factor of 3 times at 600oC.
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U2 - 10.1149/09101.1791ecst
DO - 10.1149/09101.1791ecst
M3 - Conference contribution
AN - SCOPUS:85073218003
T3 - ECS Transactions
SP - 1791
EP - 1797
BT - Solid Oxide Fuel Cells 16, SOFC 2019
A2 - Eguchi, K.
A2 - Singhal, S. C.
PB - Electrochemical Society Inc.
T2 - 16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019
Y2 - 8 September 2019 through 13 September 2019
ER -