Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"membrane electrode assembly"”.
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Towards a Membrane Electrode Assembly for a Thermally Regenerative Fuel Cell
… that is analyzed is a polymer electrolyte membrane fuel cell (PEMFC), powered by the electro-oxidation of H2 and the electro-reduction of propiophenone. The main products of this fuel cell should be 1-phenyl-1-propanol and electricity. The 1-phenyl-1-propanol should then be converted back …
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Next-generation ionomers for proton exchange membrane fuel cells From catalyst¿ionomer interactions to membrane¿electrode assembly performance and durability
L'abstract è presente nell'allegato / the abstract is in the attachment
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Study of the relationships between polymer electrolyte membrane fuel cell membrane electrode assembly component manufacturing defects and cell performance, A
Includes bibliographical references (pages 65-68).
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Influence of catalyst ink mixing procedures on catalyst layer properties and in-situ PEMFC performance
… by improving the platinum utilisation in the membrane electrode assembly. The platinum utilisation is a strong function of the catalyst layer preparation step and there remains significant scope for optimisation of this step. Whereas significant work has been conducted into the different …
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Modeling of solid oxide fuel cells
A comprehensive membrane-electrode assembly (MEA) model of Solid Oxide Fuel Cell (SOFC)s is developed to investigate the effect of various design and operating conditions on the cell performance and to examine the underlying mechanisms that govern their performance. We review and compare the …
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Evaluation and Characterization Testing of Liquid Fuel Cell Chemistry for Applications in Unmanned Underwater Vehicles
… cell improvements by eliminating GDLs from a Membrane Electrode Assembly (MEA), and to identify the best candidates for a near-neutrally-buoyant fuel cell.
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Probing the influence of relative humidity and temperature on the sulfonated silica ceramic carbon electrode for PEM fuel cell operation
… However, the Nafion ionomer employed in the electrode of the conventional fuel cells performs poorly under low RH and temperatures above 80 °C due to dehydration. A sulfonated silica ceramic carbon electrode (SS-CCE) has been developed to replace the Nafion-based electrode (NBE) because of …
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Towards reliable correlation of microporous layer physical characteristics and PEMFC electrochemical performance
Polymer electrolyte membrane (PEM) fuel cells are promising clean energy alternatives to non - sustainable fossil fuels. During fuel cell operation, external humidification of reactant gases is typically required in order to increase PEM conductivity for improved performance. However, the use of …
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Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications
… cathode ORR catalysts of proton exchange membrane fuel cells (PEMFCs), with a focus on better PGM utilization and enhanced catalyst durability. The work is structured of two primary aspects: i) optimization of catalyst synthesis, including a seed-mediated route for octahedral PtNi …
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Development of Tin Oxide As An Oxidation-Resistant Support For Pem Fuel Cells
… of cathode catalysts in proton exchange membrane fuel cells (PEMFCs) is perhaps the most critical issue that hinders the success of PEMFCs application. Specific durability requirements include resistance to corrosion of the catalyst support, stability of the electrochemical surface area …
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Mechanics of proton exchange membranes : time, temperature, and hydration dependence of the stress-strain behavior of persulfonated polytetrafluorethylene
… gasses become more of a concern. Proton Exchange Membrane Fuel Cells (PEMFC), in which protons from hydrogen gas are passed across a membrane to react with oxygen gas producing electricity, with water as the only waste product, are a cleaner and potentially more efficient chemical energy …
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The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance
… results showed that our cell with a commercial membrane electrode assembly (MEA) behaved identically to a commercial cell with the same MEA. Membranes were for their role in senor performance. Membranes for power generation, such as Nafion, were investigated and while they showed good …
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Modified Nafion membranes for hydrogen production in Cu-Cl thermochemical cycle
… to a water electrolysis cell and employs a membrane electrode assembly (MEA) that utilizes a proton exchange membrane (PEM). Nafion, the most widely used PEM, is permeable to cations and neutral species. Because of this, Cu can permeate the membrane and enter the cathode where it is readily …
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Microscopic and spectroscopic characterization of fuel cell catalyst layer materials and interfaces
Polymer electrolyte membrane fuel cells (PEMFCs) are a central technology for the decarbonization of the heavy-duty transportation sector and of industrial processes. This thesis is focused on detailed electron microscopy and x-ray spectroscopy characterization of composition and morphology of …
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Integrated micro fuel cells with on-board hydride reactors and autonomous control schemes
… that facilitates integration with a fuel cell membrane electrode assembly (MEA) are key elements for micro energy conversion. Millimeter-scale reactors (ca. 10 µL) have been developed, for hydrogen production through hydrolysis of CaH2 and LiAlH4, to yield volumetric energy densities of the …
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Water management strategies for polymer electrolyte fuel cells (PEFCs) employing microchannel flowfields
… how different operating conditions and different membrane electrode assembly (MEA) designs affect the overall performance and water management of a fuel cell using microchannel flow fields. This study investigated two water management strategies for PEFCs employing microchannel flowfields, namely …
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Electrochemistry of formic acid and carbon dioxide on metal electrodes with applications to fuel cells and carbon dioxide conversion devices
… at which the catalyst poison is removed from the electrode surface. This poison is detrimental to fuel cell operation. This work reports the first such studies in an electrochemical cell on high surface area platinum and palladium nanoparticles. New catalyst formulations were developed via …
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Performance analysis of bioanode materials and the study of the metabolic activity of Rhodopseudomonas palustris in photo-bioelectrochemical systems
… maximum power output of 393±20 μW m-2 in a membrane electrode assembly (MEA)-type BPV device, mainly due to reduced electrochemical polarisation. A proof of concept study compared the performance of screen-printed graphene onto a membrane separator against 3D-printed bioanodes coated with …
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Comparative analysis of Polymer Electrolyte Membrane (PEM) fuel cells
… ionomers for making the Polymer Electrolyte Membrane Fuel Cells (PEMFC) membranes owing to their extensive intrinsic chemical stability and super sulfonic acid strength which is core to the PEMFC proton conductivity. This thesis presents a deeper analysis into these PFSA ionomer membrane …
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