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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Mitigation of CO poisoning in hydrogen fuel cell.
 Kalabis, David ; Yakovlev, Yurii (advisor) ; Mališ, Jakub (referee)
This diploma thesis aims at studying a process of hydrogen fuel cell poisoning by molecules of carbon monoxide. Low loading platinum-ruthenium anode catalysts prepared by magnetron co-sputtering were studied. The chemical composition and crystallographic structure of the co-sputtered catalyst were analysed by X-ray photoelectron spectroscopy (XPS), energy- dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis (XRD). The process of CO poisoning was experimentally studied in half-cell and full-cell setups. Thin film catalysts were extensively studied using the rotating disk electrode (RDE) technique by analysing the desorption response of the underpotentially deposited hydrogen and copper as well as carbon monoxide stripping. Long-term and transient response to CO poisoning was investigated in the full cell setup (fuel cell operando mode) using galvanostatic potentiometry and impedance spectroscopy, respectively. A bifunctional mechanism of ruthenium in platinum anode catalyst was analysed. The mechanism of CO tolerance improvement either through adsorbed OH group formation and a change in electronic structure of alloys was discussed.
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Study of the effect of gaseous poisons on magnetron-sputtered catalyst for hydrogen fuel cell
 Kalabis, David ; Vorokhta, Mykhailo (advisor) ; Kúš, Peter (referee)
Title: Study of the effect of gaseous poisons on magnetron-sputtered catalyst for hydrogen fuel cell Author: David Kalabis Department: Department of Electronics and Vacuum Physics Supervisor: Mgr. Mykhailo Vorokhta, Ph.D., Department of Surface and Plasma Science Abstract: This bachelor thesis aims at studying effects and processes occurring on the surface of different PtRu catalysts for hydrogen fuel cells in connection with gaseous poisoning by CO. For these purposes the catalytic layers containing different proportions of Pt and Ru were made on porous membranes and glassy carbon. The technology of magnetron sputtering and plasma etching were used for their preparation. The layers were studied by several techniques and the properties of the alloys with respect to CO poisoning were determined. It was shown that increasing the concentration of Ru in the PtRu catalyst leads to higher catalyst resistivity against CO poisoning. However, starting from some point the catalyst total activity in fuel cell started to decrease, indicating that there is a defined upper limit for the Ru concentration in the bimetallic catalyst equal to about 50% in the alloy. The results of this work clearly indicate the high potential of magnetron sputtered PtRu catalysts in fuel cell applications. Keywords: fuel cell, hydrogen,...
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