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.
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Showing 1 to 20 of 80 for “"ELECTROCHEMICAL REACTIONS"”.
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The Local Structure of Sodium-Ion Anodes During Electrochemical Reactions
… able to achieve a 847 mAhg$^-1$, with numerous electrochemical features suggesting an interesting (dis)charge mechanism. It has previously been shown that both of these systems proceed through disordered phases, and as such, we focus on pair distribution function analysis (PDF) and solid-state …
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Design and manufacturing of a microcalorimeter for measuring heat flows in electrochemical reactions to milli-Kelvin precision
… made in understanding the material origins of electrochemical performance under discharging and charging conditions, there is still very limited understanding of the thermodynamics and thermal science, including heat transfer, of such reactions. Several methods and procedures that have been …
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Kinetics of hydrogen evolution and absorption during electrochemical reactions as determined by monitoring the volume of hydrogen bubbles
The piezo electric technique (P.E.T) devised in this department is a highly sensitive method for measuring the total volume of gas bubbles suspended in a solution. This is achieved by simply performing a static compressibility test, causing small pressure fluctuations in the volume of a solution …
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Voltage control of electrical, optical and magnetic properties of materials by solid state ionic transport and electrochemical reactions
… is through solid-state ionic transport and electrochemical reactions in thin film structures, where the properties of materials can be electrically controlled by a gate voltage in an addressable way. Here we explore using such ionic gating method to control the electrical, optical and …
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Interplay between electronic structure and catalytic activity in transition metal oxide model system
… is limited by the slow kinetics of the oxygen electrochemical reactions. Transition-metal oxides can exhibit high catalytic activity for oxygen electrochemical reactions, which can be used to improve efficiency and cost of these devices. Identifying a catalyst "design principle" that links …
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Dynamic in-Plane Potential Gradients for Actively Controlling Electrochemical Reactions: Part I. Characterization of 1- and 2-Component Alkanethiol Monolayer Gradients on Thin Gold Films. Part II. Applications of in-Plane Potential Gradients
… of in-plane potential gradients is discussed. Electrochemical reactions other than electrosorption of alkanethiols were demonstrated with over-potential deposition of copper onto gold films. One application of these patterns is to control the movement of supermolecular objects. As a first step …
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Solid Oxide Fuel Cell Modeling at the Cell Scale - Focusing on Species, Heat, Charge and Momentum Transport as well as the Reaction Kinetics and Effects
Fuel cells are electrochemical devices that directly transform chemical energy into electricity. They are promising for future energy systems, since they are energy efficient, able to use renewable fuels and, when hydrogen is used as fuel, there are no direct emissions of greenhouse gases. Various …
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Electrochemical Treatment of Tumors (EChT)
Electrochemical treatment of cancerous tumors is a minimally invasive, versatile and relatively safe technology in which the direct electric current is changed to destructive reaction products by electrochemical reactions at electrode surfaces. It is believed that extreme cathodic and anodic pH …
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MATHEMATICAL MODELING OF LIAL/FES¬2 HIGH TEMPERATURE BATTERY SYSTEM
… solid phases and electrolyte, complex multi-step electrochemical and chemical reactions in the electrodes are described in this model. The model includes the effects of precipitation salt on active area in the electrode and the discharge capacity. In addition, the model also takes the change in …
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Hydrodynamically modulated voltammetry in microreactors
… to study mechanisms of electrolysis reactions. The initial chapters provide an overview of applications and research development in the fields of micro-engineering and electrochemistry, including microfabrication methodology, electrochemical detection techniques and analysis methods. …
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An investigation into the relationship between electrochemical properties and flotation of sulphide minerals
… minerals using xanthates as collectors and the electrochemical properties of the flotation system. It is well known that electrochemical mechanisms in flotation systems have a major influence on flotation since the reactions occurring at the mineral/solution interface are of critical importance …
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Experimental And Theoretical Analysis Of The Electronic Behavior In Five-Coordinate Iron(iii) And Six-Coordinate Cobalt(iii) Complexes With Electroactive Phenol-Rich Ligands
… Co(III) complexes were synthesized and their electrochemical reactions were investigated in details.</p>
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Mathematical Modeling of An Anode-Supported Micro-Tubular Sofc Powered by Ammonia
… anode porosity, tortuosity and thickness) on the electrochemical properties of micro-tubular fuel cells.</p> <p> Our modeling results show that the polarization loss decreases with increasing operation temperature, which is attributed to enhanced activity of the electrochemical reactions. …
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Numerical modeling of interface dynamics and transport phenomena in transport-limited electrolysis processes
Electrochemical reactions in materials and processes induce morphological instability on the cathode, which can lead to porous deposits or system failure. The growth of the protrusion is a complex phenomenon which involves chemical, electrical, and momentum driving forces in the system. Thus, it is …
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Designing new electrode materials for energy devices by integrating ab initio computations with experiments
Utilization of Ni2+/Ni4+ double redox couple in electrochemical reactions has been tested as a way to gauge useful properties such as high capacity in electrode materials. The feasibility of a Ni2+/Ni4+ active redox couple is confirmed in a new layered electrode material, Lio.gNi045Ti5502. First …
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Developing Time-Resolved Synchrotron Infrared Spectroscopy for Spectroelectrochemical Measurements
This thesis details my work in developing spectroelectrochemical platforms utilizing synchrotron infrared radiation (SIR) and time-resolved FTIR to study the kinetics of electrochemical reactions on second to millisecond scale with high chemical sensitivity. It will cover development of …
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Experimental electrochemical investigation of Si/A1 in tetra-methyl ammonium hydroxide (TMAH)
… is suspected that this difficulty is related to electrochemical phenomena, and this work explores the electrochemistry of Si/TMAH and Al/Si/TMAH by measurements of open-circuit potentials (OCP) of a galvanic cell. It is found that the presence of Al in the etchant, electrically connected to the …
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Proton dynamics in ultrathin GdO𝑥H𝑦 films for magneto-ionics
… through voltage control of ion transport and electrochemical reactions. This thesis focuses on protonic defects in gadolinium oxide and gadolinium hydroxide (GdOxHy). Protons are mobile in this oxide at room temperature, and hydrogen incorporation can control a variety of materials properties, …
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Plasmonic hot carrier-driven electrochemistry
… how plasmon-induced hot-carriers drive chemical reactions is needed. This work examines how different hot carrier distributions affect electrochemical reactions of plasmonic nanoparticles, and how applied electrochemical potentials can be used to modify the reactivity of hot carriers. Using …
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Modeling of advanced integrated circuit planarization processes : electrochemical-mechanical planarization (eCMP), STI CMP using non-conventional slurries
… Models of efficient and environmentally benign electrochemical-mechanical copper planarization (eCMP) are developed, with a focus on electrochemical mechanisms and wafer-scale uniformity. Specifically, previous models for eCMP are enhanced to consider the full electrochemical system driving …
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