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Electrochemically deposited ceria structures for advanced solid oxide fuel cells

Citation

Brown, Evan Cornell (2011) Electrochemically deposited ceria structures for advanced solid oxide fuel cells. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:05262011-123505549

Abstract

As the pursuit towards emissions reduction intensifies with growing interest and nascent technologies, solid oxide fuel cells (SOFCs) remain an illustrious candidate for achieving our goals. Despite myriad advantages, SOFCs are still too costly for widespread deployment, even as unprecedented materials developments have recently emerged. This suggests that, in addition to informed materials selection, the necessary power output—and, thereby, cost-savings—gains must come from the fuel cell architecture. The work presented in this manuscript primarily investigates cathodic electrochemical deposition (CELD) as a scalable micro-/nanoscale fabrication tool for engineering ceria-based components in a SOFC assembly. Also, polymer sphere lithography was utilized to deposit fully connected, yet fully porous anti-dot metal films on yttira-stabilized zirconia (YSZ) with specific and knowable geometries, useful for mechanistic studies. Particular attention was given to anode structures, for which anti-dot metal films on YSZ served as composite substrates for subsequent CELD of doped ceria. By tuning the applied potential, a wide range of microstructures from high surface area coatings to planar, thin films was possible. In addition, definitive deposition was shown to occur on the electronically insulating YSZ surfaces, producing quality YSZ|ceria interfaces. These CELD ceria deposits exhibited promising electrochemical activity, as probed by A.C. Impedance Spectroscopy. In an effort to extend its usefulness as a SOFC fabrication tool, the CELD of ceria directly onto common SOFC cathode materials without a metallic phase was developed, as well as templated deposition schemes producing ceria nanowires and inverse opals.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Fuel Cells, Electrochemical Deposition, Thin Films, Ceria
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Materials Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Haile, Sossina M.
Thesis Committee:
  • Haile, Sossina M. (chair)
  • Greer, Julia R.
  • Goddard, William A., III
  • Rossman, George Robert
Defense Date:20 May 2011
Record Number:CaltechTHESIS:05262011-123505549
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:05262011-123505549
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6451
Collection:CaltechTHESIS
Deposited By: Evan Brown
Deposited On:27 May 2011 20:38
Last Modified:25 Apr 2013 17:57

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