서브메뉴
검색
Development of Proton-Conducting Electrolytes with Enhanced Performance and Stability for Reversible Solid Oxide Cells
Development of Proton-Conducting Electrolytes with Enhanced Performance and Stability for Reversible Solid Oxide Cells
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260209102907
- ISBN
- 9798265406361
- DDC
- 621
- 저자명
- Luo, Zheyu.
- 서명/저자
- Development of Proton-Conducting Electrolytes with Enhanced Performance and Stability for Reversible Solid Oxide Cells
- 발행사항
- [Sl] : Georgia Institute of Technology, 2023
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- 형태사항
- 205 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Liu, Meilin.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2023.
- 초록/해제
- 요약Reversible solid oxide cells (ReSOCs) that efficiently operate under both fuel cell (fuel to energy) and electrolysis (energy to fuel) modes in a switchable manner are a promising technology for energy storage and conversion. Proton-conducting electrolytes are attracting increasing attention due to their promising conductivity at intermediate temperatures, enabling operation of ReSOCs with high efficiency. However, one of the reasons that they have not been widely adopted is the lack of an electrolyte material that possesses both high ionic conductivity and sufficient stability, especially against high concentrations of steam and carbon dioxide. This objective of this work is to develop novel proton-conducting electrolyte materials for high-performance ReSOCs.To achieve high proton conductivity, acceptor doping with rare earth elements is a commonly used strategy, which is critical to the formation of protonic defects. The results reveal that conductivity, ionic transference number (tion), chemical stability, and compatibility with NiO (a common fuel-electrode material) are all closely correlated with dopant size. In particular, the reactivity with NiO is found to strongly affect the properties of the electrolytes and hence cell performance. Among all compositions studied, an electrolyte with proper acceptor dopant shows excellent chemical stability and minimal reactivity towards NiO, as predicted from density functional theory (DFT)-based calculations and confirmed by experimental results. In addition, proton-conducting reversible solid oxide cells (P-ReSOCs) based on the optimized electrolyte demonstrate excellent stability and exceptional performance.Donor doping is an effective strategy for improving the chemical stability of BaCeO3-based proton conductors. However, donor-doped materials often exhibit very low conductivity. The enhanced proton conductivity of donor-doped barium cerate is demonstrated by compensating the incorporation of donor dopants with excess acceptor doping, highlighting the potential of defect chemistry engineering for enhancing conductivity and durability simultaneously. When compared to the state-of-the-art proton conductors with similar conductivity, the optimized donor-doped electrolyte materials demonstrate a significantly enhanced chemical stability, especially against high concentrations of steam, which is vital to water electrolysis for hydrogen production.Since the donor dopant needs to be electrically compensated by acceptor dopant, the donor doping concentration should be sufficiently small to ensure chemical compatibility between electrolyte and a Ni-based electrode. Accordingly, to further improve the chemical stability of proton conductors for CO2-involved applications, a promising isovalent dopant is identified by DFT-based computational screening. The results indicate that the new class of electrolytes not only show better chemical stability, but also have much improved tion than conventional Zr-doped counterparts, which may allow the use of hydrocarbon fuels and more efficient CO2-H2O co-electrolysis.While the development of new materials is the focus of this thesis, the technical approach is composed of various electrochemical techniques, surface characterization, and computational modeling to understand the rationale behind the difference in properties. It is hoped that the concepts developed in my studies can offer insights into the rational design of novel materials for chemical and energy transformation technologies.
- 일반주제명
- Fuel cells
- 일반주제명
- Electrolytes
- 일반주제명
- Electrodes
- 일반주제명
- Spectrum analysis
- 일반주제명
- Energy consumption
- 일반주제명
- Conductivity
- 일반주제명
- Carbon dioxide
- 일반주제명
- Adsorption
- 일반주제명
- Electron microscopes
- 일반주제명
- Alternative energy
- 일반주제명
- Analytical chemistry
- 일반주제명
- Chemical engineering
- 일반주제명
- Optics
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260203s2023 us c eng d■001000017365981
■00520260209102907
■006m o d
■007cr#unu||||||||
■020 ▼a9798265406361
■035 ▼a(MiAaPQ)AAI32315755
■035 ▼a(MiAaPQ)GeorgiaTech75087
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aLuo, Zheyu.
■24510▼aDevelopment of Proton-Conducting Electrolytes with Enhanced Performance and Stability for Reversible Solid Oxide Cells
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a205 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Liu, Meilin.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2023.
■520 ▼aReversible solid oxide cells (ReSOCs) that efficiently operate under both fuel cell (fuel to energy) and electrolysis (energy to fuel) modes in a switchable manner are a promising technology for energy storage and conversion. Proton-conducting electrolytes are attracting increasing attention due to their promising conductivity at intermediate temperatures, enabling operation of ReSOCs with high efficiency. However, one of the reasons that they have not been widely adopted is the lack of an electrolyte material that possesses both high ionic conductivity and sufficient stability, especially against high concentrations of steam and carbon dioxide. This objective of this work is to develop novel proton-conducting electrolyte materials for high-performance ReSOCs.To achieve high proton conductivity, acceptor doping with rare earth elements is a commonly used strategy, which is critical to the formation of protonic defects. The results reveal that conductivity, ionic transference number (tion), chemical stability, and compatibility with NiO (a common fuel-electrode material) are all closely correlated with dopant size. In particular, the reactivity with NiO is found to strongly affect the properties of the electrolytes and hence cell performance. Among all compositions studied, an electrolyte with proper acceptor dopant shows excellent chemical stability and minimal reactivity towards NiO, as predicted from density functional theory (DFT)-based calculations and confirmed by experimental results. In addition, proton-conducting reversible solid oxide cells (P-ReSOCs) based on the optimized electrolyte demonstrate excellent stability and exceptional performance.Donor doping is an effective strategy for improving the chemical stability of BaCeO3-based proton conductors. However, donor-doped materials often exhibit very low conductivity. The enhanced proton conductivity of donor-doped barium cerate is demonstrated by compensating the incorporation of donor dopants with excess acceptor doping, highlighting the potential of defect chemistry engineering for enhancing conductivity and durability simultaneously. When compared to the state-of-the-art proton conductors with similar conductivity, the optimized donor-doped electrolyte materials demonstrate a significantly enhanced chemical stability, especially against high concentrations of steam, which is vital to water electrolysis for hydrogen production.Since the donor dopant needs to be electrically compensated by acceptor dopant, the donor doping concentration should be sufficiently small to ensure chemical compatibility between electrolyte and a Ni-based electrode. Accordingly, to further improve the chemical stability of proton conductors for CO2-involved applications, a promising isovalent dopant is identified by DFT-based computational screening. The results indicate that the new class of electrolytes not only show better chemical stability, but also have much improved tion than conventional Zr-doped counterparts, which may allow the use of hydrocarbon fuels and more efficient CO2-H2O co-electrolysis.While the development of new materials is the focus of this thesis, the technical approach is composed of various electrochemical techniques, surface characterization, and computational modeling to understand the rationale behind the difference in properties. It is hoped that the concepts developed in my studies can offer insights into the rational design of novel materials for chemical and energy transformation technologies.
■590 ▼aSchool code: 0078.
■650 4▼aFuel cells
■650 4▼aTransmission electron microscopy
■650 4▼aElectrolytes
■650 4▼aElectrodes
■650 4▼aSpectrum analysis
■650 4▼aEnergy consumption
■650 4▼aConductivity
■650 4▼aScanning electron microscopy
■650 4▼aCarbon dioxide
■650 4▼aAdsorption
■650 4▼aElectron microscopes
■650 4▼aAlternative energy
■650 4▼aAnalytical chemistry
■650 4▼aChemical engineering
■650 4▼aOptics
■690 ▼a0363
■690 ▼a0486
■690 ▼a0542
■690 ▼a0752
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17365981▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


