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Showing 1 to 20 of 44 for “"Pt(111)"”.
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Pattern formation and evolution on Pt(111) by grazing incident ion bombardment
… during grazing incidence ion bombardment from a Pt(111) sample, it was possible to determine the different sputtering yields of ions impinging either on ascending step edges or hitting onto flat terraces. From the analysis of damage patterns of single ion impacts and low fluence experiments it …
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THEORETICAL PREDICTIONS OF POTENTIALS FOR INTERMEDIATE STEPS IN METHANOL AND ETHANOL ELECTROCHEMICAL OXIDATION ON Pt(111)
… and ethanol electrochemical oxidation on Pt(111) were investigated using quantum mechanics theory. The reversible potential for each electron-transfer step and the reaction energy for non-electron transfer steps were calculated in bulk solution using Interface 1.0. This density functional …
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The ultra-selective hydrogenation of Furfural on PtCu supported bimetallic nanoparticles and on Pt(111) under ultra-high vacuum
… a biomass platform molecule, was studied on Pt based heterogeneous catalysts and model single crystal surfaces. Hydrogenation reactions were carried out at pressures ranging from ultra-high vacuum to 20 bar. Temperature Programmed Desorption data in conjunction with Scanning Tunnelling …
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Phase diagram for the co-adsorption of O and OH on Pt(100) and Pt(111) as determined by DFT
The Langmuir adsorption isotherm is often used to model molecular adsorption on catalyst surfaces. The model assumes that adsorption occurs on a homogenous energy surface at specific localized sites with no lateral interactions between adsorbents. This simplification causes some concerns when …
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The Structure and Activity of Admetal-Modified Single Crystal Platinum and Gold Electrodes
… were decorated by noble metal islands (Ru, Os or Pt) by the spontaneous deposition procedure. These surfaces were characterized by scanning tunneling microscopy (STM) and electrochemical methods to develop fundamental structure-activity relationships relevant to direct methanol fuel cell research. …
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The mobility of oxygen containing species (OCS*) over Pt-based catalyst surfaces: Impact on the oxygen reduction reaction (ORR) activity
… the ORR catalyst are therefore needed. An in depth understanding of the ORR mechanism over Pt surfaces can enable rational approaches in the search for more active ORR catalysts. The ORR occurs over multi-faceted Pt nanoparticles which predominantly expose Pt{111} and Pt{100} facets. Most …
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DFT insight into the oxygen reduction reaction (ORR) on the Pt₃Co(111) surface
… The preferred catalyst for the PEMFC is a Pt-catalyst. However, due to the slow oxygen reduction reaction (ORR) kinetics, high Pt loadings have to be used. The high Pt loadings lead to high costs of the PEMFC. Pt-Co alloys have been identified as catalysts having higher ORR activity higher …
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Laserspektroskopische Untersuchungen zur Adsorption und Reaktion von CO auf katalytisch aktiven Oberflächen
In dieser Arbeit wurde die optische Summenfrequenz-Spektroskopie (SFG) verwendet, um ausgehend von einer Kalibrierung der CO SFG-Spektren gegen die absolute Oberflächenbedeckung mittels kombinierter TPD-, LEED- und SFG-Messungen sowie kinetischer Modellrechnungen die CO-Adsorption auf Pt(111)-, …
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Segregation and Phase Dynamics in Supported Bimetallic Nanoparticles
… between a silicon monolayer deposited on Pt(111) by chemical vapor deposition (CVD) using silane (SiH$\sb4)$ is described. Using Auger electron spectroscopy (AES), Si was found to readily diffuse into the Pt substrate and sequentially form at least two unique intermetallic Pt-Si surface …
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The Adsorption of Nitric Oxide and Thiophene on Platinum Single Crystals
The adsorption of nitric oxide on Pt(210), Pt(100), and Pt(111) was studied using X-ray photoelectron (XPS) and Auger electron (AES) spectroscopies. Nitric oxide was found to molecularly adsorb on Pt(210) at room temperature but to dissociate upon heating to 450 K. The same behavior was noted on …
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Sulphur dioxide oxidation mechanism on Pt surfaces : a DFT study
… energy in order to lower fossil fuel consumption and its environmental impact. Hydrogen (H2) has been proposed as a viable alternative to fossil fuels due to its high energy per unit mass, as well as its low environmental impact. Despite numerous methods that exist for obtaining H2, …
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Insight into the structure and reactivity at solid-liquid interfaces
… presenting calculations on the properties of Pt(111) as a catalytic surface, using Molecular Dynamics (MD) coupled with Density Functional Theory (DFT), to calculate the dynamics and energetics of the reacting systems. Whereas the last chapter deals with using high dimensional neural network …
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Boundary Layer Dynamics in Mixed Hydrocarbon Thin Films on Metal Surfaces
Hydrocarbon bilayers on Pt(111) are an ideal model system for studying the dynamics of molecules in organic thin films. These adsorbates form a well-ordered and well-defined molecular assembly. While maintaining a crystalline-like structure, molecules in this assembly are able to diffuse distances …
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Characterization of Platinum-Based Heterogeneous Electrocatalysts and Catalysis Modeling
… osmium is a less effective promoter on a Pt(111) surface than ruthenium at low potentials, advantageous for fuel cell application.
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Investigation of surface structures at catalytically important metals by UHV - electron spectroscopic and electrochemical methods
… and results of an investigation of adsorbates at Pt(111) and Rh(100) single crystal electrodes and the basic electrochemical behavior of Rh(100) in perchlorate electrolyte. The measurements were made in a UHV (ultra high vacuum) - electrochemistry transfer system which allowed rapid contamination …
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