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 14 of 14 for “"oxygen adsorption"”.
-
The application of low dose SIMS to surface studies on compound semiconductors
… of GaAs substrates in UHV for MBE growth and adsorption studies - and the use of SIMS in studying low coverage oxygen adsorption on MBE grown (111)PbTe and (100)GaAs surfaces. As a monitoring technique for surface preparation, SIMS shows the presence of oxygen on (100)GaAs at coverages below …
-
Fundamental understanding and design principles of oxide/metal surfaces for lithium storage
… layers against electrolyte decomposition and oxygen loss from the lattice. This highlights the importance of metal oxyfluoride species toward material stability and cell efficiency. The reaction kinetics, catalyst effects and reaction mechanism of Li-O2 batteries were investigated by …
-
Molecular oxygen adsorbates at a Au/Ni(111) surface alloy and their role in catalytic CO oxidation at 70 - 250 K
Oxygen is observed to adsorb molecularly on 0.13 - 0.27 ML Au/Ni(1 111) surface alloys at 77 K, in stark contrast to dissociative adsorption on Ni and no adsorption on Au surfaces. Molecular 02 adsorbates on the Au/Ni(111) surface alloy are identified by their 0=0 vibrational modes at 790, 850 and …
-
Synthesis, characterization and reactivity of transition metal containing zeolites
… the rate of crystal growth. X-ray diffraction, oxygen adsorption, FTIR and SEM were utilized to evaluate crystal purity. X-ray photoelectron spectroscopy (XPS), chemical analysis and electron microprobe analysis were performed in order to ascertain the position (intrazeolitic versus surface) and …
-
Adsorption and Reaction Microcalorimetry on Nickel and Platinum Single Crystal Surfaces
The unique Cambridge single crystal adsorption microcalorimeter has been applied to a range of systems of catalytic interest to extract fundamental thermodynamic data. Coverage-dependent adsorption heats and sticking probabilities have been obtained with CO, NO, oxygen and ethylene adsorbates and …
-
THE USE OF GASEOUS METAL OXIDE AS AN OXYGEN CARRIER IN COAL CHEMICAL LOOPING COMBUSTION
… chemical looping technologies utilize solid oxygen carriers and has some disadvantages, especially when solid fuels like coal are used. In this work, a novel chemical looping process using gaseous metal oxide as oxygen carrier was proposed. The reaction of activated charcoal with gas-phase …
-
Processing and Optical Uses of Van der Waals Layered Materials
… lowering processing temperature by controlling oxygen concentration. We identify opposite roles of oxygen during the sulfurization process as a reaction catalyst or an inhibitor, for MoS₂ and TiS₂ formation respectively. In MoS₂, O₂ promotes the crystallization of MoS₂ at lower temperature (as …
-
Fundamental studies of perovskite related oxide thin films for oxygen electrocatalysis at intermediate temperatures
… currently utilized for applications including oxygen permeation membranes and solid oxide fuel cells (SOFCs), but alternative materials with higher catalytic activity and stability are required for intermediate temperature (500 - 700 °C) oxide electrocatalysts. In this thesis, two promising …
-
Investigation of nanoscale mechanisms driving erosion and pitting in graphitic carbon
… in multi-layer graphene, initiated by adsorbed oxygen surface groups on the graphene basal plane. A carbon-oxygen reaction model from prior studies is modified and used, with the main modification being the addition of reactions that result in defect initiation from an initially pristine …
-
An investigation of the performance and stability of zinc oxide thin-film transistors and the role of high-k dielectrics.
… device performance and stability. The effect of oxygen (O2) adsorption on TFT device characteristics is also investigated. The structural quality of the material (defect type and concentration), electrical and optical properties (transmission/absorption) of semiconductor materials are usually …
-
Theoretical and experimental study of solid oxide fuel cell (SOFC) using impedance spectra
… anode and the heterogeneous electrocatalysis of oxygen reduction reaction (ORR) at the cathode. First, anode was diagnosed to be mainly controlled by multicomponent gas diffusion inside the anode bulk (supporting) layer, and the Dusty Gas model is identified as an appropriate model to describe …
-
Investigation of a Spinning Disc as a Thin Film Photocatalytic Reactor for the Degradation of Recalcitrant Wastewaters
… forcing from the peristaltic pump enhancing the adsorption of the oxygen and/or enhanced electron transfer from the catalyst to the oxygen. Adsorption of oxygen and/or electron transfer to the oxygen are often found to be the rate limiting step in photocatalytic reactions. The enhanced oxygen …
-
Halocarbon Reactions on the Chromium (III) Oxide (101̲2) Surface
… surface dissociatively adsorb molecular oxygen to form a (1×1), terminating chromyl (Cr=O) layer that is stable to >1100 K. TDS and AES were used to investigate the reactivity of the halo-alkanes CFCl₂CH₂Cl, CF₂ClCH₂Cl, CF₃CH₂Cl, and CF₂CH₂F, in addition to the halo-alkenes CFCl=CH₂ and …
-
Theory and Utility of the Three Isotope Fractionation Relationship
… of isotope geochemistry began with the study of oxygen isotope geothermometry, most famously for carbonates. Traditionally oxygen isotope studies are only concerned with the relationship between one rare isotope, oxygen-18, and the common isotope, oxygen-16. In these cases, the abundance of the …