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Synthesis, Structure and Proton Conduction of Substituted BaTiO3 and BaZrO3 Perovskites

Seikh Rahman (Institutionen för kemi- och bioteknik)
Göteborg : Chalmers University of Technology, 2013. ISBN: 978-91-7385-927-1.- 216 s.
[Doktorsavhandling]

Proton conducting oxides can be beneficial as electrolyte materials in devices such as fuel cells, hydrogen sensors etc. Proton conducting fuel cells (PCFCs), utilising H2 as fuel, stand out as a promising technology for future clean energy generation. The works herein is devoted to improve the performance of current state of the art perovskite structured BaZrO3 based electrolyte materials as well as synthesise and characterise novel electrolytes within the BaTiO3 based systems. Usually acceptor doping of these perovskites allows for proton conductivity in hydrogen containing atmosphere. In this thesis heavily co-doped strategy along with the impact of addition of sintering aid (ZnO) and various synthesis routes in BaZrO3 based materials is being tested. Heavily doped BaTiO3 based systems are also synthesised for the first time and characterised with an emphasis on proton conduction. This work is based on techniques such as X-ray powder diffraction studies, neutron powder diffraction, thermogravimetric analysis and AC impedance spectroscopy. In addition a neutron total scattering study is employed for the first time to understand the local structural environment for the deuteron position in a proton conducting electrolyte. Co-doping and sintering aid (in solution synthesis) for the In/Yb:BaZrO3 electrolyte seems to be beneficial. Heavily substituted Sc/In:BaTiO3 materials also show enhanced proton conductivity.

Nyckelord: New proton conductor, heavily doped oxygen deficient perovskite (BaTiO3/ BaZrO3), X-ray and neutron powder diffraction, Rietveld refinements, deuteron position, Impedance spectroscopy, neutron total scattering, RMC modelling.



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Denna post skapades 2013-10-25. Senast ändrad 2014-02-27.
CPL Pubid: 185674

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik (2005-2014)

Ämnesområden

Energi
Materialvetenskap
Hållbar utveckling
Innovation och entreprenörskap (nyttiggörande)
Fysik

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


Proton Conductivity in Mixed B-Site Doped Perovskite Oxide BaZr[sub 0.5]In[sub 0.25]Yb[sub 0.25]O[sub 3 - delta]


Synthesis and Enhanced Proton Conduction in a 20 mol% Ytterbium Doped Barium Zirconate Ceramic Using Zn as Sintering Aid


50 mol% indium substituted BaTiO3: Characterization of structure and conductivity


Examination

Datum: 2013-11-20
Tid: 10:00
Lokal: 10:an, Kemivägen 10, Chalmers University of Technology
Opponent: Dr. Stephen Skinner, Imperial College London, England.

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