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 9 of 9 for “"Charge efficiency"”.
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Incorporation of charged polysaccharide binders to improve capacitive deionization performance
… osmosis for the treatment of brackish water. One efficiency-limiting phenomenon is the repulsion of co-ions, which can be mitigated via ion selectivity through the addition of fixed charge in the form of ion-exchange membranes (IEMs) or surface-modified electrodes. In this work, we introduce a …
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Understanding ionic transport in the macrostructure of polysaccharide bound electrodes for capacitive deionization
… water, such as groundwater. Lifetime and charge efficiency (CE) are the two metrics which determine the competitiveness of CDI technologies, which is why enhancing design is a major developmental challenge. It is known that ion-exchange membranes (IEMs) and chemical surface modification …
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A combined modeling and experimental study assessing the impact of fluid pulsation and operating schemes on charge and energy efficiency in capacitive deionization
… deionization (CDI) can suffer from various charge-efficiency loss mechanisms. In conventional CDI, we show that salt residue within electrodes introduces a temporal lag between charge and desalination stages of a CDI cycle. Without accounting for this effect in the collection of effluent, …
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Organic fouling in membrane capacitive deionization systems
… well as 10-15% declines in salt adsorption and charge efficiency, and a similar increase in desalination energy over 20 hours of operation. The pressure increased overall, but showed cyclical increases and decreases suggesting that fouling was worsened with increased salt concentration during …
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Benefits of battery-uItracapacitor hybrid energy storage systems
… The metric for quantifying the benefits is charge efficiency - the amount of energy delivered to the load per unit charge supplied by the battery. The efficiency gain is defined as the difference in charge efficiency between the hybrid and the battery-only ESS. A custom experimental …
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Capacitive deionization performance of bi-tortuous activated carbon electrodes coated with asymmetrically charged polyelectrolytes
… metrics like equivalent circuit resistance and charge efficiency also greatly impact CDI operation and performance. Planar composite CDI electrodes exhibit poor energetic performance due the resistance associated with salt depletion and tortuous diffusion in the macroporous structure. In this …
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Engineering efficient desalination systems: Materials development and systems analysis in capacitive deionization
… viability of CDI systems is limited by the low charge efficiency and influent concentration reduction of carbon electrodes. Numerous material modifications and architectural strategies have been individually proposed to overcome these limitation. The most common method of increasing charge …
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Charge Carrier Balance in Lead Halide Perovskite Light Emitting Diodes
Charge balance in light emitting diodes (LEDs) is a critical determinant of their performance. Charge balance is directly related to the External Quantum Efficiency (EQE), and is thought to have additional effects on device endurance and stability. In this thesis I present a series of experiments …
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Application of scalable and inexpensive modification on carbon in clean technologies
… with cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) measurements. The electrochemical cells consisting of a pair of such electrodes are then studied for CDI by flow of 1000 ppm NaCl solution between the two electrodes, i.e., in the flow-by configuration. Three different CDI …