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Synthesis and structural characterisation of solid oxide fuel cell materials

Corrie, Benjamin (2015)
Ph.D. thesis, University of Birmingham.

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Abstract

Three general systems, tetrahedrally coordinated oxides, apatite oxides and brownmillerite type Ba\(_2\)Sc\(_2\)O\(_5\) systems have been investigated.

Powder diffraction indicated the successful incorporation of aluminium and gallium into Ba\(_2\)GeO\(_4\) which led to an increase in ionic conductivity, with a further increase of an order of magnitude in wet atmospheres due to proton conductivity.

Neutron diffraction and TGA studies indicated the successful incorporation of water and flourine in La\(_8\)Sr\(_2\)(Si/Ge)\(_6\)O\(_2\)\(_6\) apatites. The interstitial positions for flourine and water ions were different from each other and for germanium and silicon apatites suggesting that the interstitial positions are composition dependant rather than universal for apatite systems.

Neutron diffraction, TGA and AC impedance spectroscopy indicated successful doping of Y/Yb into BaSc\(_0\)\(_.\)\(_6\)\(_5\)\(_-\)\(_x\)Ti\(_0\)\(_.\)\(_3\)O\(_2\)\(_.\)\(_6\)\(_5\) stabilising the oxygen deficient perovskite structure with increased stability of CO\(_2\) and good conductivity. Whilst neutron diffraction of 4K on hydrated BaSc\(_0\)\(_.\)\(_2\)\(_5\)Y\(_0\)\(_.\)\(_4\)\(_5\)Ti\(_0\)\(_.\)\(_3\)O\(_2\)\(_.\)\(_6\)\(_5\) has located the proton positions.

Type of Work:Ph.D. thesis.
Supervisor(s):Slater, Peter
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Subjects:QD Chemistry
Institution:University of Birmingham
ID Code:5993
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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