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Structure/Property Relations in Bulk Versus Solution Derived Proton Conducting Ceramics of the Form SrCe0.95Yb0.05O3 With Applications in Membrane Separations

Published online by Cambridge University Press:  01 February 2011

Kyle Brinkman ,
Elise B Fox ,
Paul Korinko ,
Robert Lascola ,
Qiang Liu  and
Fanglin Chen
Kyle Brinkman
Affiliation:
kyle.brinkman@srnl.doe.gov, Savannah River National Laboratory (SRNL), Materials Science and Technology Directorate, Aiken, South Carolina, United States
Elise B Fox
Affiliation:
elise.fox@srnl.doe.gov, Savannah River National Laboratory (SRNL), Materials Science and Technology Directorate, Aiken, South Carolina, United States
Paul Korinko
Affiliation:
paul.korinko@srnl.doe.gov, Savannah River National Laboratory (SRNL), Materials Science and Technology Directorate, Aiken, South Carolina, United States
Robert Lascola
Affiliation:
robert.lascola@srnl.doe.gov, Savannah River National Laboratory, Analytical Development, Aiken, South Carolina, United States
Qiang Liu
Affiliation:
QIANG@cec.sc.edu, University of South Carolina, Mechanical Engineering, Columbia, South Carolina, United States
Fanglin Chen
Affiliation:
CHENFA@cec.sc.edu, University of South Carolina, Mechanical Engineering, Columbia, South Carolina, United States
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Abstract

Membrane separations are a key enabling technology for future energy conversion devices. Ionic transport membranes must have both proton and electronic conductivity to function as hydrogen separation membranes without an external power supply. A technical obstacle to material modification by compositional changes is that the hydrogen flux through a dense membrane is a function of both the proton ionic conductivity and the electronic conductivity. An alternative way to modify the materials conductivity without changing the ratio of the chemical constituents is by altering the microstructure. In this study, SrCe0.95Yb0.05O3 was produced by conventional mixed oxide bulk ceramic techniques and chemical solution routes self-rising approaches using urea as the leavening agent. In conventional ceramic processing routes, the perovskite phase was observed to form at temperatures near 1300oC, while solution techniques resulted in perovskite phase formation starting near 1000oC with complete phase transformations occurring at 1100oC. Thermogravimetric analysis (TGA) was conducted in various gas atmospheres resulting in bulk oxide route powders exhibiting a 0.6% weight loss at 800oC under a nitrogen environment as compared to chemically derived powders which displayed weight losses on the order of 3.4%.The increased weight loss observed in chemically derived SrCe0.95Yb0.05O3 is correlated with an increase in the number of electron charge carriers and results in elevated electronic conduction. This study will report on the development of structure property relations in the model proton conducting ceramic system SrCe0.95Yb0.05O3.

Keywords

ionic conductornanostructureoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1256: Symposium N – Functional Oxide Nanostructures and Heterostructures , 2010 , 1256-N16-30
Copyright
Copyright © Materials Research Society 2010

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