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dc.contributor.authorBagacki, Rory
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.description.abstractPolymer electrolyte membrane (PEM) electrolyzers are ideally suited to pairing with renewable energy sources given the capability to operate at high current densities and transition between different potential loading. To become commercially competitive however PEM electrolyzers require improvements in performance and cost reduction. Much of the technology for PEM electrolysis has comes from PEM fuel cells, leaving room for improvement. The slower reaction kinetics and highly corrosive environment at the anode due to the oxygen evolution reaction (OER) in particular requires research and development to increase efficiency. This study focuses on the behavior of two-phase flow of oxygen in water as it relates to cell performance. Optical visualization with a high speed camera was used to observe oxygen bubbles at the anode during PEM electrolysis. Images of oxygen bubbles in two-phase flow were successfully recorded using three experimental setups: a sample holder submerged in a water filled tank, a modified channel-less PEM electrolyzer cell and a modified PEM electrolyzer cell with optically accessible channels. Image processing pathways were successfully developed using MATLAB and Fiji to study individual bubbles in all setups. The channel-less electrolyzer setup operated at a much lower performance than standard PEM electrolyzer cells. It is suspected that contact resistance reduces the electrochemical performance either as a result of the in-plane conductivity for the PTL being very high or large ohmic contact losses where the PTL contacts the current distributor. The optically accessible channel design was able to operate at performances comparable to an unmodified cell and bubble images were captured in-situ to observe bubbly to annular flow regimes over a range of current densities. This investigation showed that flow field channel aspect ratio is an important determinant to cell performance.en_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsCC0 1.0 Universal*
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectPEM electrolyzeren_US
dc.subjectTwo-phase flowen_US
dc.subjectBubble formationen_US
dc.subjectOptical visualizationen_US
dc.titleOptical Visualization of Two Phase Flow in PEM Electrolyzersen_US
dc.description.degreeMaster of Applied Scienceen_US
dc.contributor.supervisorPharoah, Jon
dc.contributor.departmentMechanical and Materials Engineeringen_US

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CC0 1.0 Universal
Except where otherwise noted, this item's license is described as CC0 1.0 Universal