|
|
Organic semoconductors and devices
Kočer, Martin ; Doc.Ing.Ota Salyk, CSc. (referee) ; Špinka, Jiří (advisor)
Introduction part of this bachelor's thesis deals about general properties of organic semiconductors, their structure and features of selected representatives. The middle section deals with some methods of application of organic semiconductors and organic devices. The final section deals about practical production of polyaniline samples and their analysis.
|
|
|
Computer control of the deposition process
Pavera, Michal ; Voborný, Stanislav (referee) ; Urbánek, Michal (advisor)
This bachaloers thesis deals with automation of the deposition process of the ultrathin layers by IBAD method. One of the tasks is to design motorized target and shutter manipulator. The thesis therefore contain drawings of these manipulators. Which enable their control by stepper motors. Second task is to design of electronics and program control of primary and secondary ion source. In this part is described connection of the system with the computer using AD/DA converters and the appropriate programming. Last part of the thesis deals with differences between automated and manual control of the system, their advantages and disadvantages.
|
|
|
Thin-film catalysts for proton exchange membrane water electrolyzers and unitized regenerative fuel cells
Kúš, Peter ; Matolín, Vladimír (advisor) ; Napporn, Teko Wilhelmin (referee) ; Plecenik, Tomáš (referee)
This dissertation thesis revolves around hydrogen economy and energy-storage electrochemical systems. More specifically, it investigates the possibility of using magnetron sputtering for deposition of efficient thin-film anode catalysts with low noble metal content for proton exchange membrane water electrolyzers (PEM-WEs) and unitized regenerative fuel cells (PEM-URFCs). The motivation for this research derives from the urgent need of minimizing the price of mentioned electrochemical devices should they enter mass production. Numerous experiments were carried out, correlating the actual in-cell performance with the varying position of thin-film catalyst within the membrane electrode assembly, with the composition of high-surface support sublayer and with the chemical structure of the catalyst itself. The wide arsenal of analytical methods ranging from electrochemical impedance spectroscopy through scanning electron microscopy to photoelectron spectroscopy allowed us to describe complex phenomena behind different obtained efficiencies. Consequent systematic optimizations led to the design of novel PEM-WE anode thin-film iridium catalyst with thickness of just 50 nm, supported on optimized TiC-based sublayer which performed similarly to standard counterparts despite using just a fraction of their noble metal...
|
|
|
Thin-film catalysts for proton exchange membrane water electrolyzers and unitized regenerative fuel cells
Kúš, Peter ; Matolín, Vladimír (advisor)
This dissertation thesis revolves around hydrogen economy and energy-storage electrochemical systems. More specifically, it investigates the possibility of using magnetron sputtering for deposition of efficient thin-film anode catalysts with low noble metal content for proton exchange membrane water electrolyzers (PEM-WEs) and unitized regenerative fuel cells (PEM-URFCs). The motivation for this research derives from the urgent need of minimizing the price of mentioned electrochemical devices should they enter mass production. Numerous experiments were carried out, correlating the actual in-cell performance with the varying position of thin-film catalyst within the membrane electrode assembly, with the composition of high-surface support sublayer and with the chemical structure of the catalyst itself. The wide arsenal of analytical methods ranging from electrochemical impedance spectroscopy through scanning electron microscopy to photoelectron spectroscopy allowed us to describe complex phenomena behind different obtained efficiencies. Consequent systematic optimizations led to the design of novel PEM-WE anode thin-film iridium catalyst with thickness of just 50 nm, supported on optimized TiC-based sublayer which performed similarly to standard counterparts despite using just a fraction of their noble metal...
|
|
|
Thin-film catalysts for proton exchange membrane water electrolyzers and unitized regenerative fuel cells
Kúš, Peter ; Matolín, Vladimír (advisor)
This dissertation thesis revolves around hydrogen economy and energy-storage electrochemical systems. More specifically, it investigates the possibility of using magnetron sputtering for deposition of efficient thin-film anode catalysts with low noble metal content for proton exchange membrane water electrolyzers (PEM-WEs) and unitized regenerative fuel cells (PEM-URFCs). The motivation for this research derives from the urgent need of minimizing the price of mentioned electrochemical devices should they enter mass production. Numerous experiments were carried out, correlating the actual in-cell performance with the varying position of thin-film catalyst within the membrane electrode assembly, with the composition of high-surface support sublayer and with the chemical structure of the catalyst itself. The wide arsenal of analytical methods ranging from electrochemical impedance spectroscopy through scanning electron microscopy to photoelectron spectroscopy allowed us to describe complex phenomena behind different obtained efficiencies. Consequent systematic optimizations led to the design of novel PEM-WE anode thin-film iridium catalyst with thickness of just 50 nm, supported on optimized TiC-based sublayer which performed similarly to standard counterparts despite using just a fraction of their noble metal...
|
|
|
Thin-film catalysts for proton exchange membrane water electrolyzers and unitized regenerative fuel cells
Kúš, Peter ; Matolín, Vladimír (advisor) ; Napporn, Teko Wilhelmin (referee) ; Plecenik, Tomáš (referee)
This dissertation thesis revolves around hydrogen economy and energy-storage electrochemical systems. More specifically, it investigates the possibility of using magnetron sputtering for deposition of efficient thin-film anode catalysts with low noble metal content for proton exchange membrane water electrolyzers (PEM-WEs) and unitized regenerative fuel cells (PEM-URFCs). The motivation for this research derives from the urgent need of minimizing the price of mentioned electrochemical devices should they enter mass production. Numerous experiments were carried out, correlating the actual in-cell performance with the varying position of thin-film catalyst within the membrane electrode assembly, with the composition of high-surface support sublayer and with the chemical structure of the catalyst itself. The wide arsenal of analytical methods ranging from electrochemical impedance spectroscopy through scanning electron microscopy to photoelectron spectroscopy allowed us to describe complex phenomena behind different obtained efficiencies. Consequent systematic optimizations led to the design of novel PEM-WE anode thin-film iridium catalyst with thickness of just 50 nm, supported on optimized TiC-based sublayer which performed similarly to standard counterparts despite using just a fraction of their noble metal...
|
|
|
Organic semoconductors and devices
Kočer, Martin ; Doc.Ing.Ota Salyk, CSc. (referee) ; Špinka, Jiří (advisor)
Introduction part of this bachelor's thesis deals about general properties of organic semiconductors, their structure and features of selected representatives. The middle section deals with some methods of application of organic semiconductors and organic devices. The final section deals about practical production of polyaniline samples and their analysis.
|
|
|
Computer control of the deposition process
Pavera, Michal ; Voborný, Stanislav (referee) ; Urbánek, Michal (advisor)
This bachaloers thesis deals with automation of the deposition process of the ultrathin layers by IBAD method. One of the tasks is to design motorized target and shutter manipulator. The thesis therefore contain drawings of these manipulators. Which enable their control by stepper motors. Second task is to design of electronics and program control of primary and secondary ion source. In this part is described connection of the system with the computer using AD/DA converters and the appropriate programming. Last part of the thesis deals with differences between automated and manual control of the system, their advantages and disadvantages.
|
guest ::
