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 48 for “"energy conversion devices"”.
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Ultrasonic synthesis of materials for energy conversion devices
… about the fact that the development of improved energy conversion and storage devices is the biggest issue in the 21st century. A variety of mobile electronics are on the market more than ever, and battery-powered electrical vehicles are no longer a dream. However, the energy conversion and …
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Development and characterization of solar energy conversion devices based on nanocomposite semiconductors
… of the development and characterization of solar energy conversion devices based on nanocomposite semiconductors. The PhD research is focused on third generation solar cells, namely in dye−sensitized solar cells (DSSCs) and perovskite solar cells (PSCs). The innovation of this study is detected on …
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Heat and mass transfer in porous materials for passive energy-conversion devices
L'abstract è presente nell'allegato / the abstract is in the attachment
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EARTH-ABUNDANT METAL CHALCOGENIDES: SYNTHESIS, INTERFACE MODIFICATION, AND APPLICATIONS IN ENERGY CONVERSION DEVICES
… attracted significant attention in a variety of energy devices for the wide range of properties that MCs can offer by combining different metal cations and chalcogen anions. However, the most common MCs used for photovoltaic and thermoelectric devices all consist rare or toxic elements which …
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M13 bacteriophage-enabled assembly of nanocomposites : synthesis and application in energy conversion devices
Lack of energy supply and non-uniform distribution of traditional energy sources, such as coal, oil, and natural gas, have brought up tremendous social issues. To solve these issues, highly efficient energy conversion devices including solar cells, water splitting cells, and lithium-ion batteries …
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The potential for alternative technology to supply the energy needs of the rural population of South Africa
… aimed at evaluating the potential of alternative energy devices to satisfy the energy requirements of the underdeveloped rural regions of South Africa. A literature survey of the energy requirements of the inhabitants of such regions is first undertaken. Thereafter energy conversion devices using …
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Molecular control of interfacial inner-sphere electron
The interconversion of electrical and chemical energy relies on the intimate coupling of protons and electrons to activate small molecules including 02, C0 2, and H20. The mechanistic pathways governing the proton- and electron-transfer steps are key to the efficiency of catalysis because they …
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Design, Synthesis and Spectroscopy of Highly Absorptive Chromophores Based on the Bis(tridentate)metal-ethyne-(porphinato)metal Molecular Framework for Solar Energy Conversion
… photosensitizers are in great demand for solar energy conversion applications that include dye-sensitized solar cells, photoelectrochemical cells, and photo-redox catalysis. In this dissertation, the design, synthesis and spectroscopy of a series of different highly absorptive chromophoric …
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Investigation of Novel Electrolytes for Use in Lithium-Ion Batteries and Direct Methanol Fuel Cells
<p>Energy storage and conversion plays a critical role in the efficient use of available energy and is crucial for the utilization of renewable energy sources. To achieve maximum efficiency of renewable energy sources, improvements to energy storage materials must be developed. In this work, novel …
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THERMAL AND THERMOELECTRIC PROPERTIES OF TWO-DIMENSIONAL HETEROSTRUCTURES
… stacked on another, are being established for devices with new functionalities and improved properties. The study of thermal properties is important for heat management of electronic devices while good thermoelectric properties are desired for energy-conversion devices. Despite numerous studies …
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Synthesis and Characterization of Anhydrous Proton Conducting Polymer Electrolytes for Fuel Cell Applications
… electro chromic windows and light emitting devices. Fuel cells are efficient electrochemical energy conversion devices; they can generate greener energy from chemical fuels. The polymer electrolyte membrane is heart of most fuel cell designs separating the oxidant and fuel chambers and …
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Study on the photoelectric hot electrons generation and transport with metallic-semiconductor photonic crystals
… junctions allows for optical-to- electrical energy conversion at photon energies below the bandgap of the semiconductor. Which opens new opportunities in optical sensors and energy conversion devices. In this thesis research, the wafer-scale metallic-semiconductor photonic crystal (MSPhC) has …
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ELECTROCATALYTIC PROCESSES FOR ENERGY STORAGE & CONVERSION
… in its fast depletion leading to an escalating energy crisis as well as several environmental issues leading to increased research towards sustainable energy conversion. Electrocatalysts play crucial role in the development of numerous novel energy conversion devices including fuel cells and …
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Infiltrated composite electrodes for solid oxide fuel cells
… oxide fuel cells (SOFCs) are electrochemical devices which can convert chemical energy to electrical energy with efficiencies up to 60%. In order for SOFCs to be favorable energy conversion devices, the power obtained from a unit volume should be improved. This corresponds to minimized …
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Nanoengineered surfaces for advanced thermal management
… including integrated circuits (ICs) and energy conversion devices. As the heat fluxes exceed 100 W/cm2, novel cooling solutions need to be developed. Thin film evaporation is a promising approach because the large latent heat associated with phase change can be utilized while the thermal …
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Rational control of hydrothermal nanowire synthesis and its applications
… has a major impact on the development of novel energy conversion devices, high density electronics, and optical devices. However, detailed growth mechanism is still in early stage of its development. This thesis presents the fundamental understanding of controlled zinc oxide nanowire synthesis …
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Many-body processes in the photophysics of colloidal semiconductor nanocrystals
… CM would improve the performance of solar energy conversion devices, but it is weak in the bulk. Recent reports by several groups suggested highly efficient CM in semi-conductor NCs. We describe here our assessment of CM using transient photoluminescence in CdSe and lead chalcogenide NCs. …
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A multiscale model for the oxide ion conducting and proton conducting solid oxide cells
Solid oxide cells (SOCs) are high-efficiency energy conversion devices under high temperature. However, the key reaction mechanisms governing the overall performance of SOCs are not well understood. Here, we develop a multiscale model combining density functional theory calculations, transition …
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Thermal radiative properties of disordered media and deep metal gratings
… has enormous applications in energy harvesting and saving, thermal management, photonics and optical sensing. The present dissertation investigates the spectral radiative properties of various materials and micro/nanostructures by performing three research tasks. (1) Radiative …
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Transients in Polymer Electrolyte Membrane (PEM) Fuel Cells
The need for energy efficient, clean and quiet, energy conversion devices for mobile and stationary applications has presented proton exchange membrane (PEM) fuel cells as a potential energy source. The use of PEM fuel cells for automotive and other transient applications, where there are rapid …
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