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Electrochemical and Transport Analysis of Thin-Film Composite Membranes in Saltwater Electrolysis
Electrochemical and Transport Analysis of Thin-Film Composite Membranes in Saltwater Electrolysis
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105321
- ISBN
- 9798297666214
- DDC
- 600
- 서명/저자
- Electrochemical and Transport Analysis of Thin-Film Composite Membranes in Saltwater Electrolysis
- 발행사항
- [Sl] : The Pennsylvania State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 177 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Logan, Bruce E.
- 학위논문주기
- Thesis (Ph.D.)--The Pennsylvania State University, 2025.
- 초록/해제
- 요약Saltwater electrolysis powered by renewable energy sources is a carbon neutral alternative to traditional hydrogen production methods that emit carbon dioxide as a biproduct. To make this technology economically competitive, research is focused on developing new electrolyzer components and configurations that reduce capital costs and minimize chloride ion transport to the anode. Thin-film composite (TFC) membranes are being studied as a costeffective alternative to the ion exchange membranes currently used in commercial electrolysis. Most ion transport studies of TFC membranes have been conducted under reverse osmosis (RO) water filtration conditions. Therefore, this work aims to broaden our understanding of ion transport across TFC membranes in saltwater electrolysis conditions. The properties of various commercial TFC membranes, a validated fundamental transport model, the importance of electrolyte composition, and impact of water transport on ion transport during electrolysis were all examined here.Thirteen membranes, classified as saltwater (SW) RO membranes, brackish water (BW) RO membranes, or cellulose triacetate (CTA) forward osmosis membranes, were obtained from commercial manufacturers. The ohmic resistances of the membranes were measured, revealing a significant difference in resistances spanning 6.1 ± 0.1 Ω cm 2 to 70 ± 30 Ω cm 2 . Five membranes were selected for further characterization: three RO membranes with low (6.1 ± 0.1 Ω cm 2 ), medium (40.1 ± 5.1 Ω cm 2 ), and high resistances (92.2 ± 20.8 Ω cm 2 ), one CTA FO membrane with a medium resistance (24 ± 5.6 Ω cm 2 ), and one NF membrane with a low resistance (14 ± 1.7 Ω cm 2 ). The membrane water fluxes, measured in a high-pressure dead-end cell, followed conventional flux trends, with the NF270 membrane showing the highest water permeability (14.6 L m -2 h - 1 bar -1 ) and the SW RO membrane the lowest (0.7 L m -2 h -1 bar -1 ). Neither the ohmic resistance nor water flux across the membrane successfully predicted the potential required or the trend in salt ion transport during two hours of saltwater electrolysis. However, water permeability did correlate with the membrane that exhibited the highest fraction of charge carried by water ions rather than salt ions. These finds suggest that traditional characterization methods for ion exchange and TFC membranes are insufficient to fully capture the complex relationship between salt ion transport, water ion transport, and overall water movement during electrolysis. A more detailed mechanistic analysis of transport phenomena is therefore necessary to better understand and predict membrane performance under electrolysis conditions.A 1-D solution-friction style transport model was validated using COMSOL Multiphysics to predict both salt and water ion transport across a commercial SW30XLE (DOW) membrane during saltwater electrolysis. To isolate ion transport without convective effects due to bubble generation at the electrodes, a batch reactor was used with large electrolyte chambers separating the membrane from the electrodes. A simplified modeling approach was taken by using uniform sizebased partitioning and frictional coefficients for each ion, regardless of their different ionic radii. Despite the minimized fitting parameters, the model successfully fit ion transport data measured during saltwater electrolysis in a stirred batch reactor with a set current density of 10 mA cm-2 and electrolyte concentrations of 600 mM. The validated model was used to predict ion transport during electrolysis at additional electrolyte concentrations (800 mM and 1000 mM) and current density (14 mA cm -2 ). The model predicted pH changes across the reactor and within the membrane, indicating that a steep pH gradient due to the water association reaction occurs in the membrane backbone.
- 일반주제명
- Friction
- 일반주제명
- Membranes
- 일반주제명
- Electrolytes
- 일반주제명
- Electrodes
- 일반주제명
- Greenhouse gases
- 일반주제명
- Oxidation
- 일반주제명
- Cellulose
- 일반주제명
- Emissions
- 일반주제명
- Permeability
- 일반주제명
- Nanofiltration
- 일반주제명
- Reverse osmosis
- 일반주제명
- Carbon dioxide
- 일반주제명
- Seawater
- 일반주제명
- Salt
- 일반주제명
- Brackish water
- 일반주제명
- Boundary conditions
- 일반주제명
- Geometry
- 일반주제명
- Climate change
- 일반주제명
- Mathematics
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■035 ▼a(MiAaPQ)AAI32289550
■035 ▼a(MiAaPQ)PennState22010rft8
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a600
■1001 ▼aTaylor, Rachel F.
■24510▼aElectrochemical and Transport Analysis of Thin-Film Composite Membranes in Saltwater Electrolysis
■260 ▼a[Sl]▼bThe Pennsylvania State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a177 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Logan, Bruce E.
■5021 ▼aThesis (Ph.D.)--The Pennsylvania State University, 2025.
■520 ▼aSaltwater electrolysis powered by renewable energy sources is a carbon neutral alternative to traditional hydrogen production methods that emit carbon dioxide as a biproduct. To make this technology economically competitive, research is focused on developing new electrolyzer components and configurations that reduce capital costs and minimize chloride ion transport to the anode. Thin-film composite (TFC) membranes are being studied as a costeffective alternative to the ion exchange membranes currently used in commercial electrolysis. Most ion transport studies of TFC membranes have been conducted under reverse osmosis (RO) water filtration conditions. Therefore, this work aims to broaden our understanding of ion transport across TFC membranes in saltwater electrolysis conditions. The properties of various commercial TFC membranes, a validated fundamental transport model, the importance of electrolyte composition, and impact of water transport on ion transport during electrolysis were all examined here.Thirteen membranes, classified as saltwater (SW) RO membranes, brackish water (BW) RO membranes, or cellulose triacetate (CTA) forward osmosis membranes, were obtained from commercial manufacturers. The ohmic resistances of the membranes were measured, revealing a significant difference in resistances spanning 6.1 ± 0.1 Ω cm 2 to 70 ± 30 Ω cm 2 . Five membranes were selected for further characterization: three RO membranes with low (6.1 ± 0.1 Ω cm 2 ), medium (40.1 ± 5.1 Ω cm 2 ), and high resistances (92.2 ± 20.8 Ω cm 2 ), one CTA FO membrane with a medium resistance (24 ± 5.6 Ω cm 2 ), and one NF membrane with a low resistance (14 ± 1.7 Ω cm 2 ). The membrane water fluxes, measured in a high-pressure dead-end cell, followed conventional flux trends, with the NF270 membrane showing the highest water permeability (14.6 L m -2 h - 1 bar -1 ) and the SW RO membrane the lowest (0.7 L m -2 h -1 bar -1 ). Neither the ohmic resistance nor water flux across the membrane successfully predicted the potential required or the trend in salt ion transport during two hours of saltwater electrolysis. However, water permeability did correlate with the membrane that exhibited the highest fraction of charge carried by water ions rather than salt ions. These finds suggest that traditional characterization methods for ion exchange and TFC membranes are insufficient to fully capture the complex relationship between salt ion transport, water ion transport, and overall water movement during electrolysis. A more detailed mechanistic analysis of transport phenomena is therefore necessary to better understand and predict membrane performance under electrolysis conditions.A 1-D solution-friction style transport model was validated using COMSOL Multiphysics to predict both salt and water ion transport across a commercial SW30XLE (DOW) membrane during saltwater electrolysis. To isolate ion transport without convective effects due to bubble generation at the electrodes, a batch reactor was used with large electrolyte chambers separating the membrane from the electrodes. A simplified modeling approach was taken by using uniform sizebased partitioning and frictional coefficients for each ion, regardless of their different ionic radii. Despite the minimized fitting parameters, the model successfully fit ion transport data measured during saltwater electrolysis in a stirred batch reactor with a set current density of 10 mA cm-2 and electrolyte concentrations of 600 mM. The validated model was used to predict ion transport during electrolysis at additional electrolyte concentrations (800 mM and 1000 mM) and current density (14 mA cm -2 ). The model predicted pH changes across the reactor and within the membrane, indicating that a steep pH gradient due to the water association reaction occurs in the membrane backbone.
■590 ▼aSchool code: 0176.
■650 4▼aFriction
■650 4▼aMembranes
■650 4▼aElectrolytes
■650 4▼aElectrodes
■650 4▼aGreenhouse gases
■650 4▼aOxidation
■650 4▼aCellulose
■650 4▼aEmissions
■650 4▼aPermeability
■650 4▼aNanofiltration
■650 4▼aReverse osmosis
■650 4▼aCarbon dioxide
■650 4▼aSeawater
■650 4▼aSalt
■650 4▼aBrackish water
■650 4▼aBoundary conditions
■650 4▼aGeometry
■650 4▼aClimate change
■650 4▼aMathematics
■690 ▼a0404
■690 ▼a0405
■71020▼aThe Pennsylvania State University.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0176
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360201▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


