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High electrode activity of nanostructured, columnar ceria films for solid oxide fuel cells

Jung, WooChul and Dereux, Julien O. and Chueh, William C. and Hao, Yong and Haile, Sossina M. (2012) High electrode activity of nanostructured, columnar ceria films for solid oxide fuel cells. Energy and Environmental Science, 5 (9). pp. 8682-8689. ISSN 1754-5692. doi:10.1039/c2ee22151a.

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Highly porous oxide structures are of significant importance for a wide variety of applications in fuel cells, chemical sensors, and catalysis, due to their high surface-to-volume ratio, gas permeability, and possible unique chemical or catalytic properties. Here we fabricated and characterized Sm_(0.2)Ce_(0.8)O_(1.9−δ) films with highly porous and vertically oriented morphology as a high performance solid oxide fuel cell anode as well as a model system for exploring the impact of electrode architecture on the electrochemical reaction impedance for hydrogen oxidation. Films are grown on single crystal YSZ substrates by means of pulsed laser deposition. Resulting structures are examined by SEM and BET, and are robust up to post-deposition processing temperatures as high as 900 °C. Electrochemical properties are investigated by impedance spectroscopy under H_2–H_2O–Ar atmospheres in the temperature regime 450–650 °C. Quantitative connections between architecture and reaction impedance and the role of ceria nanostructuring for achieving enhanced electrode activity are presented. At 650 °C, _pH_2O = 0.02 atm, and _pH_2 = 0.98 atm, the interfacial reaction resistance attains an unprecedented value of 0.21 to 0.23 Ω cm^2 for porous films 4.40 μm in thickness.

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Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2012 The Royal Society of Chemistry. Received 4th May 2012, Accepted 20th July 2012. First published on the web 20 Jul 2012. This work was supported in part by the Stanford Global Climate Energy Program and by the National Science Foundation under contract number DMR 08-43934. Additional support was provided by the National Science Foundation through the Caltech Research Science and Engineering Center (DMR-052056). FIBSEM measurements (e.g. Fig. 1e) were kindly performed by Scott Cronin and Scott Barnett of Northwestern University, under NSF DMR support through the Ceramics program.
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Stanford Global Climate Energy ProgramUNSPECIFIED
NSFDMR 08-43934
Issue or Number:9
Record Number:CaltechAUTHORS:20121009-095438339
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Official Citation:High electrode activity of nanostructured, columnar ceria films for solid oxide fuel cells WooChul Jung, Julien O. Dereux, William C. Chueh, Yong Hao and Sossina M. Haile Energy Environ. Sci., 2012, 5, 8682-8689 DOI: 10.1039/C2EE22151A
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34777
Deposited By: Ruth Sustaita
Deposited On:09 Oct 2012 21:52
Last Modified:09 Nov 2021 23:10

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