Mechanical properties of single and dual phase proton conducting membranes

Wenyu Zhou

Research output: ThesisPhD Thesis - Research external, graduation UT

115 Downloads (Pure)

Abstract

Dual-phase hydrogen permeation membranes, consisting of protonic and electronic conducting phases, shows great potential for high purity hydrogen production due to its high stability in harsh applications. Hydrogen-ion conductive perovskite phases (e.g. BaCe0.65Zr0.2Y0.15O3-δ) and electron conductive fluorite oxides (e.g. Ce0.85Gd0.15O2-δ) are promising candidate for this biphasic hydrogen transport membrane. Mechanical properties (e.g. elastic modulus, hardness, fracture toughness) of the membranes are essential parameters regarding the reliability of subsequent applications. These parameters are closely related to microstructural features such as grain size, phase distribution and defects (e.g. pores and microcracks). However, these relationships are not yet fully understood. Therefore, in this thesis, the effects of grain size, phase distribution, pores and microcracks on mechanical properties are investigated for BaCe0.65Zr0.2Y0.15O3-δ and BaCe0.65Zr0.2Y0.15O3-δ-Ce0.85Gd0.15O2-δ membranes. Material preparation procedures (e.g. milling and sintering) are optimized to overcome the difficulty in material preparation.

This PhD thesis use 6 Chapters to investigate from material synthesis to thermal-mechanical properties on the above mentioned materials.

At the end, perspectives are given regarding the improvement of the materials for higher thermal-mechanical stability.

Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Meulenberg, W.A., Supervisor
  • Nijmeijer, A., Supervisor
  • Winnubst, A.J.A., Co-Supervisor
Thesis sponsors
Award date1 Sept 2022
Place of PublicationForschungszentrum Jülich
Publisher
Print ISBNs978-3-95806-645-8, 978-90-365-5444-2
DOIs
Publication statusPublished - 1 Sept 2022

Keywords

  • Mechanical properties
  • Proton conductor
  • Dual phase

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