Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573535
Title: Anion substitution in Perovskite related materials for fuel cell applications
Author: Hancock, Cathryn Ann
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2013
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Abstract:
The work presented in this thesis focuses on two different structures, the Ruddlesden Popper and perovskite, which have shown promise as catalysts in fuel cell devices. The Ruddlesden Popper materials have interesting structural properties allowing the possible incorporation of anions within the interstitial sites. The possible incorporation of water and fluorine into these interstitial sites was investigated for the systems La\(_2\)N\(_i\)\(_O\)\(_4\)\(_+\)\(_δ\), Nd\(_2\)NiO\(_4\)\(+\)\(_δ\), La\(_2\)CuO\(_4\)\(_+\)\(_δ\) and Sr\(_3\)Fe\(_2\)O\(_7\)\(_-\)\(_y\). In the case of water incorporation, the most interesting results were observed in La\(_2\)NiO\(_4\)\(_+\)\(_δ\). For this system, large amounts of water were shown to be incorporated using an indirect method which involved fluorination of the materials followed by ion exchange. This is the first time such a method has been demonstrated. The work on the perovskite materials (SrCoO\(_3\), SrMnO\(_3\), SrFeO\(_3\) and CaMnO\(_3\)) focused on doping with various oxyanions (phosphate, silicate and sulphate). It was discovered that small amounts of oxyanion doping could be achieved, which caused a large increase in the conductivity. This increase was correlated either to a phase change on doping or in the case of the CaMnO\(_3\) material due to the resultant electron doping. Electrochemical tests were performed to determine if the materials would be of use as cathode materials in fuel cells.
Supervisor: Not available Sponsor: Engineering and Physical Sciences Research Council ; Advantage West Midlands
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.573535  DOI: Not available
Keywords: QD Chemistry
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