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 170 for “"operando"”.
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In-operando techniques for early-stage corrosion
… native state. We have, therefore, developed in-operando measurement methods. Several complementary approaches were developed: confocal fluorescence microscopy, synchrotron X-ray absorption and diffraction, and electron microscopy. These techniques address various aspects of the corrosion process …
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Helium retention induced by in-operando lithium evaporation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Operando fibre Raman sensors for Li-ion battery chemistry
… This thesis aims to develop and characterise an operando fibre-optic Raman probe, enhanced solely by optical phenomena, sensitive to the intricate and evolving surface chemistries within the cell. Experimental methods used in this thesis included optical characterisation of the forward excitation …
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Operando investigations of mechanical changes in lithium-ion batteries
… and strain development at the electrode surface. Operando Observations and First Principles Calculations of Reduced Lithium Insertion in Au-Coated LiMn2O4. The deposition of protective coatings on the spinel LMO lithium-ion battery cathode is effective in reducing Mn dissolution from the electrode …
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Operando characterisation techniques for graphene-based lithium-sulfur batteries
… dimensionality reduction. Spatially-resolved operando Raman spectroscopy was applied to acquire 2d maps of the sulfur and PS in electrodes undergoing cycling, and monitor the (re-)distribution of active material in electrodes prepared via different synthesis pathways and cycled using different …
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Macroporous metal oxide battery electrode performance analysis and operando spectroscopy
… are addressed next in the thesis in the form of operando Raman spectroscopy. The third realm is the application of operando methods to battery performance analysis, an approach which litters the literature in recent years. Traditionally, analysis of battery electrodes and the electrolyte were …
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Light-battery interactions for enhanced energy storage and operando spectroscopy
… two different routes - photobatteries and a new operando method called diffuse reflectance spectroscopy (DRS). Photobatteries are a new class of devices that aim to combine the properties of energy harvesting and storage within the same device architecture. These devices have been reported to …
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Operando Optical Tracking of Ion Dynamics and Degradation in Battery Electrodes
… and on the nano- to meso-scale. Currently, *operando* imaging of lithium-ion dynamics requires sophisticated synchrotron X-ray or electron microscopy techniques, which are not suited for high-throughput material screening and often cannot access realistic cycling rates. This limits rapid and …
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Electrochemical Liquid-Phase TEM for Operando Characterization, Setup Optimization and Experimental Assessment
L'abstract è presente nell'allegato / the abstract is in the attachment
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Study of Interfacial Chemical Reactions on Battery Electrodes Using Operando Imaging Techniques
… with and without 50 ppm water additive, using an operando reflection interference microscope (RIM). The RIM provides high sensitivity to imaging the minimal signals caused by SEI layer and allows us to observe the entire growth and stripping process of SEI in real-time. The results show that the …
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In-Situ and Operando Multimodal Microscopy of Metal Halide Perovskite Optoelectronic Devices
Metal-halide perovskites are materials at the forefront of the next generation of optoelectronic materials. Of particular interest is their remarkable power conversion efficiencies when incorporated into thin film solar cells. The properties of next-generation semiconductors such as perovskites are …
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OPERANDO X-RAY ABSORPTION SPECTROSCOPY STUDIES OF (PHOTO)ELECTRODE MATERIALS FOR H2 PRODUCTION/CONVERSION
… sweep voltammetry (LSV), and Tafel slope. (3) Operando X-ray absorption spectroscopy (XAS), as an elemental selective and powerful technique, was utilized to obtain specific elemental electronic structure information (such as the oxidation state, and coordination number) and illustrate the …
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Operando Characterization of Lithium-Ion Batteries using Lab-Scale X-ray Emission/Absorption Spectroscopy
… for lithium-ion storage is explored under operando conditions. This enables real-time monitoring of chemical shifts resulting from changing electrode potential. The relationship between energy shifts and oxidation/spin state is obtained using K-edge XANES and Kβ1,3 XES measurements of …
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Responsabilidad Social Corporativa en cuatro multinacionales operando en Colombia. Análisis comparativo de sus acciones.
Este trabajo que se titula “La Responsabilidad Social Corporativa (RSC)” en cuatro multinacionales con operaciones en Colombia: análisis comparativo de sus acciones, ha sido desarrollado para aspirar al título de MBA de la Universidad de Newport. Este ejercicio se divide en tres grandes partes: la …
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In operando SEM for the accelerated exploration of nanomaterials and their scalable device integration
… in situ microscopy platform that permits (1) operando monitoring of reactions and (2) rapid screening of different process conditions (temperatures and pressures). Herein, the development and implementation of an environmental scanning electron microscope (ESEM) that is suitable for operando …
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Real-Time Thermography for In Operando Additive Manufacturing Defect Mitigation using a Machine Learning Approach
Directed Energy Deposition (DED), a subset of additive manufacturing, produces materials such as metal–matrix composites and functionally graded coatings by utilizing a concentrated high-power laser as the primary energy source. In spite of its benefits, DED continues to be confronted by …
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Comparação entre controle por inclinação e controle mestre-escravo sem comunicação em microrredes operando no modo autônomo
… mestre-escravo sem comunicação, em microrredes operando no modo autônomo. Para representar o comportamento dinâmico das microrredes, é proposto um modelo matemático em pequenos sinais da microrrede mestre-escravo sem comunicação e desenvolvido o modelo matemático em pequenos sinais da microrrede …
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Correlative ex-situ analysis and operando ellipsometric investigation during oxygen evolution reaction of mesoporous iridium oxide model catalysts
… and the O 2p orbital. For SE studies under operando conditions, an environmental cell setup was developed that allows simultaneous spectroscopic characterization while measuring the catalytic activity of a reaction. Analyses on a platinum surface successfully demonstrate the oxidation and …
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