Behavior of La0.6sr 0.4Co0.2Fe0.2O3-δ Cathode Powders Surface Modified by Atomic Layer Deposition for Solid Oxide Fuel Cells

Behavior of La0.6sr 0.4Co0.2Fe0.2O3-δ Cathode Powders Surface Modified by Atomic Layer Deposition for Solid Oxide Fuel Cells

Atomic layer deposition (ALD) has been used to modify the surfaces of La0.6Sr0.4Co0.2Fe0.2O3-δ (LSCF) cathode powders with gadolinium doped ceria (GDC), zirconia, and cobalt doped zirconia (CDZ). Sintered porosities were ~41% for uncoated LSCF and 37-39% for surface modified powders. Mercury probe a...

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Veröffentlicht in:ECS transactions 2016-08, Vol.75 (6), p.195-202
Hauptverfasser: Roeder, Jeffrey F., Zeberoff, Anthony F, Van Buskirk, Peter C, Torabi, Alireza, Barton, Joseph, Willman, Carl, Ghezel-Ayagh, Hossein, Huang, Kevin
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container_end_page 202
container_issue 6
container_start_page 195
container_title ECS transactions
container_volume 75
creator Roeder, Jeffrey F.
Zeberoff, Anthony F
Van Buskirk, Peter C
Torabi, Alireza
Barton, Joseph
Willman, Carl
Ghezel-Ayagh, Hossein
Huang, Kevin
description Atomic layer deposition (ALD) has been used to modify the surfaces of La0.6Sr0.4Co0.2Fe0.2O3-δ (LSCF) cathode powders with gadolinium doped ceria (GDC), zirconia, and cobalt doped zirconia (CDZ). Sintered porosities were ~41% for uncoated LSCF and 37-39% for surface modified powders. Mercury probe analysis showed similar pore size distributions. Symmetrical electrochemical cells showed marked improvements in polarization for the surface modified powders. GDC and CDZ coatings decreased polarization by up to 51 and 61%, respectively, at 800°C. Equivalent circuit modeling suggested little effect on gas diffusion through the porous structure, consistent with similar porosity values. Intermediate and high frequency contributions were significantly affected, suggesting a strong positive impact of the surface modification on both non-charge-transfer properties and charge-transfer properties. A pre-fabricated symmetrical cell treated with GDC via ALD showed very similar behavior to a symmetrical cell fabricated from surface modified GDC.
doi_str_mv 10.1149/07506.0195ecst
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title Behavior of La0.6sr 0.4Co0.2Fe0.2O3-δ Cathode Powders Surface Modified by Atomic Layer Deposition for Solid Oxide Fuel Cells
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