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http://hdl.handle.net/11375/6342
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DC Field | Value | Language |
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dc.contributor.advisor | Petric, Anthony | en_US |
dc.contributor.author | Hui, Shiqiang | en_US |
dc.date.accessioned | 2014-06-18T16:35:07Z | - |
dc.date.available | 2014-06-18T16:35:07Z | - |
dc.date.created | 2010-06-10 | en_US |
dc.date.issued | 2000-12 | en_US |
dc.identifier.other | opendissertations/1659 | en_US |
dc.identifier.other | 2932 | en_US |
dc.identifier.other | 1350912 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/6342 | - |
dc.description.abstract | <p>A number of perovskite oxides, typically, heavily doped SrTiO₃ samples, were synthesized and characterized with a view to establishing their potential as anode materials for solid oxide fuel cells (SOFCs). The structure, microstructure, electrical conductivity, reduction-oxidation behavior, phase stability, compatibility with electrolytes, and performance in SOFC operation were assessed.</p> <p>Ceramic samples were prepared with the formula (Sr₁ᵪRᵪ)(Ti₁_yTy)O₃ (R = rare earth elements, T = transition metals) and with charge balance achieved by A-site deficiency. Electrical conductivities were examined by the do four-probe method and impedance spectroscopy. It was found that yttrium is soluble in SrTiO₃ (SYT) up to 8 mol% and has marked effects on conductivity. Electrical conductivities were observed to increase with increasing donor-doping level, on reduction in low oxygen partial pressures. Electrical conductivity with values as high as 82 S/cm was achieved at 800°C and P(O₂) = 10ˉ¹⁹ atm. Electrical conductivities were reversible upon reduction and oxidation. The thermal expansion coefficient is compatible with electrolyte materials such as yttria-stabilized ZrO₂ and doped LaGaO₃. Cobalt-doped SYT, which showed a relatively high resistance to oxidation, was tested as the anode material in a fuel cell. Yttrium-doped SrTiO₃ meets the requirements for the anode in SOFCs to a substantial degree, and is a promising alternative anode material.</p> | en_US |
dc.subject | Materials Science and Engineering | en_US |
dc.subject | Materials Science and Engineering | en_US |
dc.title | Evaluation of Yttrium-Doped SrTiO₃ as a Solid Oxide Fuel Cell Anode | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Materials Science | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
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fulltext.pdf | 1.28 MB | Adobe PDF | View/Open |
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