Composite, Solid-Oxide-Fuel-Cell (SOFC) electrodes of La 0.8 Sr 0.2 FeO 3 (LSF) and yttria-stabilized zirconia (YSZ) were prepared by infiltration methods and then modified by Atomic Layer Deposition (ALD) of ZrO codeposited films of different thicknesses to determine the effect of surface composition on cathode performance. Film growth rates for ALD performed using vacuum procedures at 573 K for Fe 2 O 3 and 523 K for ZrO 2 and La 2 O 3 were determined to be 0.024 nm ZrO 2 /cycle, 0.019 nm La

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... O 3 /cycle, and 0.018 nm Fe 2 O 3 /cycle. For ZrO 2 and Fe 2 O 3 , impedance spectra on symmetric cells at 873 K indicated that polarization resistances increased with coverage in a manner suggesting simple blocking of O 2 adsorption sites. With La 2 O 3 , the polarization resistance decreased with small numbers of ALD cycles before again increasing at higher coverages. When La 2 O 3 and Fe 2 O 3 were co-deposited, the polarization resistances remained low at high film coverages, implying that O 2 adsorption sites were formed on the co-deposited films. The implications of these results for future SOFC electrode development are discussed. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 207.241.231.80 Downloaded on 2018-07-20 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 207.241.231.80 Downloaded on 2018-07-20 to IP Journal of The Electrochemical Society, 164 (7) F879-F884 (2017) ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 207.241.231.80 Downloaded on 2018-07-20 to IP