Three-dimensional microstructure of high-performance pulsed-laser deposited Ni-YSZ SOFC anodes

Authors
Kennouche, DavidHong, JongsupNoh, Ho-SungSon, Ji-WonBarnett, Scott A.
Issue Date
2014-08
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.16, no.29, pp.15249 - 15255
Abstract
The Ni-yttria-stabilized zirconia (YSZ) anode functional layer in solid oxide fuel cells produced by pulsed laser-deposition was studied using three-dimensional tomography. Anode feature sizes of similar to 130 nm were quite small relative to typical anodes, but errors arising in imaging and segmentation were shown using a sensitivity analysis to be acceptable. Electrochemical characterization showed that these cells achieved a relatively high maximum power density of 1.4 W cm(-2) with low cell resistance at an operating temperature of 600 degrees C. The tomographic data showed anode three-phase boundary density of similar to 56 mu m(-2), more than 10 times the value observed in conventional Ni-YSZ anodes. Anode polarization resistance values, predicted by combining the structural data and literature values of three-phase boundary resistance in an electrochemical model, were consistent with measured electrochemical impedance spectra, explaining the excellent intermediate-temperature performance of these cells.
Keywords
OXIDE FUEL-CELLS; ELECTROLYTE; COMPOSITE; TEMPERATURE; OXIDE FUEL-CELLS; ELECTROLYTE; COMPOSITE; TEMPERATURE; Thin film SOFC; Nanostructure anode; 3-D microstructure; FIB; PLD
ISSN
1463-9076
URI
https://pubs.kist.re.kr/handle/201004/126562
DOI
10.1039/c4cp02251c
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KIST Article > 2014
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