Mechanical properties of single and dual phase proton conducting membranes

Wenyu Zhou

doi:10.3990/1.9789036554442

Mechanical properties of single and dual phase proton conducting membranes

Wenyu Zhou

Research output: Thesis › PhD Thesis - Research external, graduation UT

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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. BaCe_0.65Zr_0.2Y_0.15O_3-δ) and electron conductive fluorite oxides (e.g. Ce_0.85Gd_0.15O_2-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 BaCe_0.65Zr_0.2Y_0.15O_3-δ and BaCe_0.65Zr_0.2Y_0.15O_3-δ-Ce_0.85Gd_0.15O_2-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 language	English
Qualification	Doctor of Philosophy
Awarding Institution	University of Twente
Supervisors/Advisors	Meulenberg, W.A., Supervisor Nijmeijer, A., Supervisor Winnubst, A.J.A., Co-Supervisor
Thesis sponsors	China Scholarship Council
Award date	1 Sept 2022
Place of Publication	Forschungszentrum Jülich
Publisher	Forschungszentrum Juelich GmbH
Print ISBNs	978-3-95806-645-8, 978-90-365-5444-2
DOIs	https://doi.org/10.3990/1.9789036554442
Publication status	Published - 1 Sept 2022

Keywords

Mechanical properties
Proton conductor
Dual phase

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10.3990/1.9789036554442

PHD Thesis Wenyu ZhouFinal published version, 22.1 MB

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title = "Mechanical properties of single and dual phase proton conducting membranes",

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.",

keywords = "Mechanical properties, Proton conductor, Dual phase",

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TY - THES

T1 - Mechanical properties of single and dual phase proton conducting membranes

AU - Zhou, Wenyu

PY - 2022/9/1

Y1 - 2022/9/1

N2 - 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.

AB - 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.

KW - Mechanical properties

KW - Proton conductor

KW - Dual phase

U2 - 10.3990/1.9789036554442

DO - 10.3990/1.9789036554442

M3 - PhD Thesis - Research external, graduation UT

SN - 978-3-95806-645-8

SN - 978-90-365-5444-2

T3 - Schriften des Forschungszentrum Jülich, Reihe Energie & Umwelt / Energy & Environment

PB - Forschungszentrum Juelich GmbH

CY - Forschungszentrum Jülich

ER -

Mechanical properties of single and dual phase proton conducting membranes

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