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Permanent link (DOI): https://doi.org/10.7939/R3P88V

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Preparation and Characterization of Electrolyte Materials for Proton Conducting Fuel Cells Open Access

Descriptions

Other title
Subject/Keyword
PCFC
barium zirconate
proton conducting electrolyte
proton conductors
barium cerate
SOFC
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Gibson, Stephen B
Supervisor and department
Etsell, Thomas (Chemical and Materials Engineering)
Examining committee member and department
Jung, Jan (Physics)
Etsell, Thomas (Chemical and Materials Engineering)
Luo, Jingli (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2012-03-26T09:15:45Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
Experiments were conducted to test and characterize proton conducting electrolyte materials and layers formed by solid state reactions. Screen printed layers of yttrium doped ceria and alkaline earth carbonates were reacted at high temperatures on NiO-YSZ and NiO-CGO substrates with the intent of forming thin and dense A2+B4+O3 based perovskite layers. The layers were investigated and characterized using scanning electron microscopy, energy dispersive x-ray spectroscopy and x-ray diffraction analysis. The influence of dopant (M = Nd, Eu, Gd, Y, Yb) and atmosphere on the protonic conductivity of sintered BaCe0.5Zr0.4M0.1O2.95 pellets was investigated through impedance spectroscopy. The layer synthesis method showed promise for producing thin and dense layers of barium and strontium cerates as well as barium, strontium and calcium zirconates. The perovskite tolerance factor, a measure of the deviation from the cubic lattice, seems to correlate to the selective reactivity in the layer synthesis. Proton conduction was found to be predominant in hydrogen containing atmospheres in the low to intermediate temperature range (300-600ºC) with increased competition from alternative charge carriers as temperature increased. The highest protonic conduction was found in Yb doped BaCe0.5Zr0.4M0.1O2.95 samples. Dopants with smaller ionic radii resulted in improved tolerance factors, decreased likelihood of A-site doping and higher conductivities.
Language
English
DOI
doi:10.7939/R3P88V
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File format: pdf (Portable Document Format)
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Last modified: 2015:10:12 19:14:54-06:00
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File title: Microsoft Word - Thesis_Final_3.18.2012
File author: Stephen B. Gibson
Page count: 153
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