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 10 of 10 for “"Polymer Electrolyte Membrane Fuel Cells (PEMFCs)"”.
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MULTISCALE COMPUTATIONAL MODELING OF NANOSTRUCTURE AND TRANSPORT IN POLYMER ELECTROLYTE MEMBRANE FUEL CELLS
Polymer electrolyte membrane fuel cells (PEMFCs) are predicted to revolutionize energy conversion for transportation due to a multitude of advantages over conventional methods. However, due to their lack of resillience to adverse conditions, they are not as widespread as other portable energy …
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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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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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Water-gas shift conversion in microchannel reactors using noble metal catalysts
Fuel cell technology will play a crucial role in future sustainable energy generation. Different types of fuel cells had been developed, of which Polymer Electrolyte Membrane Fuel Cells (PEMFCs) are the fuel cells of choice for small scale stationary and mobile applications that operate under …
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Activating oxygen chemistry on metal and metal oxides: design principles of electrochemical catalysts
… many electrochemical energy devices, including polymer electrolyte membrane fuel cells (PEMFCs), water splitting electrolyzers, and rechargeable metal-air batteries, which hampers the development of new-energy applications such as electric vehicles. To increase the energy efficiency of ORR and …
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Understanding and Controlling Wettability of Carbon Powders for PEM Fuel Cell Applications
… to enhancing the performance and lifetime of polymer electrolyte membrane fuel cells (PEMFCs). As the CLs are composed of Pt nanoparticles supported on carbon powders, bound together with Nafion®, the main focus of this work was to understand and control the wettability of carbon materials for …
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Low PGM PtCo alloy catalysts for low loading Polymer Electrolyte Membrane Fuel Cells
Polymer Electrolyte Membrane Fuel Cells (PEMFCs) are a promising means of generating clean energy in especially transportation applications. The electrochemical conversion of energy is driven within membrane electrode assemblies (MEAs) over costly Pt catalyst which limits PEMFC cost viability. PtCo …
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Supported Cobalt Oxide Catalysts for the Preferential Oxidation of Carbon Monoxide: An in situ Investigation
… for power generation using proton-exchange or polymer electrolyte membrane fuel cells (PEMFCs). The removal of CO (0.5 – 2%) is essential as it negatively affects the performance of the Pt-based anode catalyst of PEMFCs. Among the various CO removal processes reported, the preferential …
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Σύνθεση, φυσικοχημικός και ηλεκτροχημικός χαρακτηρισμός ηλεκτροκαταλυτών για κυψελίδες καυσίμου υψηλής θερμοκρασίας pem
… χρησιμοποιηθεί ως καύσιµο σε κυψελίδες καυσίµου (fuel cells), όπου παράγεται ενέργεια µέσω ηλεκτροχηµικής αντίδρασης, με φιλικό προς το περιβάλλον τρόπο. Μεταξύ άλλων, οι κυψελίδες καυσίμου πολυμερικής μεμβράνης (Polymer Electrolyte Membrane Fuel Cells, PEMFCs) έχουν προσελκύσει το έντονο …
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Παρασκευή και μελέτη διμεταλλικών και τριμεταλλικών ηλεκτροκαταλυτών για κυψελίδες καυσίμου πολυμερικής μεμβράνης
… των κελιών καυσίμου πολυμερούς ηλεκτρολύτη (PEMFCs) προσφέρει πολλά πλεονεκτήματα και σε συνδυασμό με την υψηλή πυκνότητα ισχύος που αποδίδουν, τα καθιστά κύριους υποψήφιους για εφαρμογή στην αυτοκίνηση. Ωστόσο, η χαμηλή θερμοκρασία εγείρει και σημαντικά προβλήματα, όπως η χρήση ευγενών …