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Study of 3-phase catalytic layers for polymer electrolyte fuel cells and electrolysers
Fuka, Šimon ; Matolínová, Iva (advisor) ; Khalakhan, Ivan (referee)
Title: Study of 3-phase catalytic layers for polymer electrolyte fuel cells and electrolysers Author: Šimon Fuka Department: Department of Surface and Plasma Science Supervisor: doc. Mgr. Iva Matolínová, Dr., Department of Surface and Plasma Science Abstract: The diploma thesis focuses on the study of catalytic layers for Proton Exchange Membrane Fuel Cells (PEMFC) or electrolyzers based on the mixture of platinum and cerium oxide. These layers are prepared by using magnetron sputtering, their properties are studied depending on the deposition parameters or the choice of the substrate by using SEM, AFM, XPS and then tested as an anode in the fuel cell. In addition to the morphology of the catalytic layers, it has been shown that the dispersion of very small nanoparticles of the catalyst with a size of 1-2 nm has a great effect on PEMFC performance. Most of the prepared samples gave maximal and maximal specific performance much higher than the state of art values published for Pt-CeOx system. By studying properties of the layers used as the anode catalysts, this work contributes to the understanding of PEMFC fuel cell behavior and, consequently, to its potential commercialization. Keywords: Fuel cell, cerium oxide, platinum, catalyst, magnetron sputtering
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Novel nanocatalysts for fuel cells I: new type bipolar fuel cells
Švenda, Petr ; Matolín, Vladimír (advisor) ; Khalakhan, Ivan (referee)
There is a greater focus on the alternative sources of energy due to the energetic crisis recently. One of the many ways are the fuel cells, which are based on generating electricity by oxidating the hydrogen. A prominent place is occupied by cells with polymer membrane called PEMFC, which are especially suited for mobile applications due to their low operating temperature. The bigest obstacle for commercial use of the PEMFC is the big amount of platinum required for their production. It is necessary to reduce their cost by means of reducing the amount of used platinum while maintaining the same efficiency. One of the ways is using platinum in alloy with another metal instead of using pure platinum. This thesis addresses the alloy of Pt-Co prepared by magnetron sputtering, which exhibits desirable properties. Adding cobalt decreases the potential barrier that must be overcome for catalytic reaction to proceed. This results in higher specific power output of the fuel cell. The goal of this thesis is to examine in more detail the properties of Pt-Co in comparison with Pt.
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Preparation and Characterization of Novel Oxide Catalysts for Fuel Cell Applications
Khalakhan, Ivan ; Matolín, Vladimír (advisor) ; Bourgeois, Sylvie (referee) ; Strýhal, Zdeněk (referee)
V Title: Preparation and Characterization of Novel Oxide Catalysts for Fuel Cell Applications Author: Mgr. Ivan Khalakhan Department/Institute: Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Supervisor of the doctoral thesis: Prof. RNDr. Vladimír Matolín, DrSc., Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University Abstract: Present doctoral thesis focuses mainly on the morphological investigation of novel oxide catalysts prepared by magnetron sputtering deposition for fuel cell applications. Surface characterization techniques such as scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS), were used in this work. In the first chapter, the influences of different preparation parameters on the morphology of CeO2, Au doped CeO2 and Pt doped CeO2 sputtered films were investigated. It was found that morphology and stoichiometry of the catalyst film is strongly dependent on the deposition parameters and the type of substrate. We have also shown that catalyst films prepared by magnetron co-sputtering of platinum and cerium oxide exhibit high catalytic activity as anode in proton exchange membrane fuel cell (PEMFC). High surface area, low platinum loading and excellent...
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