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.
Results
Showing 1 to 20 of 51 for “"PEMFCs"”.
-
Preparation characterisation and evaluation of core shell electrocatalysts for PEMFCs
For oxygen reduction catalysis it has been shown that thin layers of platinum (shell)<br/>over a non-Pt core enhance the activity. In addition surface science studies have found that<br/>overlayers of one metal on another strongly modifies the electrocatalytic properties of the<br/>surface metal. …
-
Preparation, characterisation and evaluation of core-shell electrocatalyst for PEMFCs
For oxygen reduction catalysis it has been shown that thin layers of platinum (shell)<br/>over a non-Pt core enhance the activity. In addition surface science studies have found that<br/>overlayers of one metal on another strongly modifies the electrocatalytic properties of the<br/>surface metal. …
-
Bio-engineered gas diffusion electrodes (GDEs) for proton exchange membrane fuel cells (PEMFCs)
… of Proton Exchange Membrane Fuel Cells (PEMFCs). Successful mass production of fuel cell components combined with the recovery of PGMs from waste, more efficient PGM use or the replacement of PGMs catalyst is necessary to reduce costs per unit. Current hydrometallurgy and pyrometallurgy …
-
SYNTHESIS AND CHARACTERIZATION OF NEW ELECTROCATALYTIC MATERIALS TO IMPROVE THE PERFORMANCE, OPERABILITY AND LIFE-TIME OF PEMFCS
… focuses on proton exchange membrane fuel cells (PEMFCs), including the oxygen reduction and hydrogen oxidation reactions, the various materials and components in the PEMFCs, the durability issues of the material and PEMFCs, the applications of PEMFCs and the challenges in the further development. …
-
Evaluation of the Effects of Microporous Layer Characteristics and Assembly Parameters on the Performance and Durability of a Planar PEM Fuel Cell
… diffusion layer (GDL) and catalyst layer (CL) of PEMFCs improves performance. The major benefit of the MPL in conventional fuel cells is that it improves water management and reduces contact resistances between cell layers. Although the functions of the MPL in conventional PEMFCs are well …
-
Synthesis and Characterization of Hydrophobic-Hydrophilic Multiblock Copolymers for Proton Exchange Membrane and Segmented Copolymer Precursors for Reverse Osmosis Applications
… field of Proton Exchange Membrane Fuel Cells (PEMFCs) and Reverse Osmosis (RO) applications. In particular, wholly aromatic sulfonated poly(arylene ether sulfone)s are of considerable interest in the field of PEMFCs and RO, due to their affordability, high Tg, and the ease of sulfonation. …
-
Electrochemical Characterization of Platinum based anode catalysts for Polymer Exchange Membrane Fuel Cell
… and to identify the best anode catalysts for PEMFCs that tolerates the CO fed with reformed hydrogen.
-
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 …
-
Novel Polyphenylquinoxaline and Polybenzimidazole Proton Exchange Membranes For High Temperature Fuel Cell Systems
<p>Proton exchange membrane fuel cells (PEMFCs) have recently been acknowledged as one of the most promising alternative power sources due to their clean and efficient operation, as well as their numerous applications in transportation, stationary, cogeneration, and portable systems. High …
-
Development of Tin Oxide As An Oxidation-Resistant Support For Pem Fuel Cells
… 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 against platinum …
-
Catalyst Layer Design in Polymer Membrane Fuel Cells
… (ORR) in proton exchange membrane fuel cells (PEMFCs). The most realistic method of estimating the performance of non-PGM catalysts is testing within membrane electrode assemblies (MEAs). One key issue is that non-PGM catalysts are not as active as platinum. One way to increase their …
-
Materials For Energy: Complex Oxides And Nitrides For New Polymer Electrolyte Membrane Fuel Cell Catalysts And Supports
… required for large-scale commercialization of PEMFCS, and must be stable in low pH (1-2) and up to +1.5 V (vs. SHE). The material also needs to be porous and conducting (at least 0.1 S cm-1). Furthermore, the catalyst support should also be capable of strongly binding Pt or Pt-based catalysts. …
-
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 …
-
Water-gas shift conversion in microchannel reactors using noble metal catalysts
… which Polymer Electrolyte Membrane Fuel Cells (PEMFCs) are the fuel cells of choice for small scale stationary and mobile applications that operate under transient conditions.The feed for PEMFCs is hydrogen. For small scale stationary and mobile applications, the hydrogen, typically, has to be …
-
Synthesis and characterization of Pt/TiO2/C composite catalysts for fuel cells prepared using a glucose modifier
… of polymer exchange membrane fuel cells (PEMFCs) serve a critical function in reactions which can be used to generate electrical energy from chemical fuels. Pt nanoparticles are commonly dispersed on a conductive support and used as electrode materials in these devices because of their …
-
A DFT study of the interaction of Ox with Pt nanorod edge sites : a model for the ORR activity on Pt nanoparticle edges
Proton exchange membrane fuel cells (PEMFCs) are an attractive energy conversion technology, this due to their high theoretical fuel utilization efficiencies compared to Carnot engines. However, due to potential losses, the operational efficiencies achieved in state-of-the-art PEMFCs are only …
-
The mobility of oxygen containing species (OCS*) over Pt-based catalyst surfaces: Impact on the oxygen reduction reaction (ORR) activity
… proton exchange membrane fuel cells (PEMFCs) more attractive for automotive application. One of the major problems facing PEMFCs is the sluggish kinetics of the oxygen reduction reaction (ORR). To further enable wide-scale commercialisation of PEMFCs for automotive applications, major …
-
Understanding and Controlling Wettability of Carbon Powders for PEM Fuel Cell Applications
… 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 their use in PEMFCs. The droplet …
-
A Study Of Electrocatalysis In The Oxygen Reduction Reaction Using OpenCatalyst, a Deep-Learning Platform.
… of Proton Exchange Membrane Fuel Cells (PEMFCs) is fundamentally influenced by the Oxygen Reduction Reaction (ORR) at the cathode. This dissertation presents a comprehensive investigation into the ORR kinetics and mechanism, with a specific focus on the electrocatalytic properties of …
-
Development of Proton Exchange Membrane for Fuel Cell and Electrolyzer
… for proton exchange membrane fuel cells (PEMFCs) and water electrolysis systems. Two novel membrane design strategies were investigated: (i) modification of porous PTFE substrates with dopamine and sulfonated dopamine to fabricate reinforced PTFE/Nafion composite membranes, and (ii) …
Page 1 of 3