Structural and electrochemical characterization of two proton conducting oxide thin films for a microfabricated solid oxide fuel cell

The use of proton conducting oxide materials as an electrolyte offers the potential to reduce the operating temperature of a solid oxide fuel cell (SOFC), leading to improved thermal management and material compatibility. However, many proton conducting materials have not yet been investigated for residual stress and electrochemical properties in thin film form. This research characterizes the thermomechanical and electrochemical properties of two promising materials: Yttria doped Barium Cerate (BaCeo.9Yo0.O) and Terbium doped Strontium Cerate (SrCeo0.95TbYo.050O), for use in a microfabricated SOFC (gSOFC). Uniform, crack-free thin films of both compositions were produced by sputter deposition. Films with thickness ranging from 150 nm to 600 nm were deposited on a fused silica substrate. The desired composition was achieved for both films at a deposition temperature of 5750C, though minor secondary phases were also present. Residual stress for different film thicknesses was measured as a function of temperature using the wafer curvature technique.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2006

Author dc:creator

• Capozzoli, Peter M

Advisor dc:contributor.advisor

• Brian L. Wardle.

• Aeronautics and Astronautics.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/37953

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/37953