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 17 of 17 for “"redox cycles"”.
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Redox cycles with doped calcium manganites for high-temperature thermochemical energy storage in concentrating solar power
Redox cycles with reducible perovskite oxides of the form ABO$_3$ can provide thermochemical energy storage (TCES) with higher energy density and storage temperatures than molten-salt systems for large-scale energy storage in concentrating solar power (CSP). Perovskites from earth abundant cations …
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System and Reactor Design, and Materials Testing, for Efficient Thermochemical Solar Fuel Production in Temperature/Pressure Swing Redox Cycles
… solar thermochemical hydrogen (STCH) with redox cycles using non-stoichiometric metal oxides. This pathway uses renewable heat, including concentrated solar, coupled with thermal energy storage for continuous, round-the-clock green hydrogen production. High-temperature heat (> 1300℃) is …
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Conjugated polymer based materials via the incorporation of polymerizable units
… revealed an excellent reversibility in the redox cycles. The deposited polymer films also showed reversible color change between oxidized and neutral states. In Chapter 2, three different conjugated polymers having interesting properties and/or useful applications were synthesized and …
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Does Sulfide Affect Short Term Iron Oxidation?
<p>The reduction potential of the Fe(II)/Fe(III) redox couple overlaps those of naturally occurring forms of C, O, N and S, and electron transfer between Fe and these elements is often kinetically facile. The chief intermediary in this process appears to be reactive oxygen species (ROS) generated …
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Circadian rhythms of redox state and regulation of neuronal excitability in suprachiasmatic nucleus of rodents
… is sensitive to metabolic (redox) change; however, energetic cycles manifest as circadian rhythms in protein oxidation have been reported in anucleate cells, where no transcription occurs. Whether the brain clock expresses redox cycles and how such metabolic oscillations …
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Evaluating new Oxygen Transfer Materials for Air Separation, Oxy-Fuel Combustion and other Processes
… the kinetic parameters and stability over many redox cycles is carried out. Although oxygen is an important industrial gas used for many applications, here, chemical looping air separation is investigated as a method of avoiding the emission of CO$_2$ from a power plant $via$ oxy-fuel combustion …
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Production of Light-independent Reactive Oxygen Species during Microbially-mediated Fe(II)/Fe(III) redox cycling and its Application in the Degradation of Organic Contaminants
… (•OH), represent transient reactants that are redox active and ubiquitous in aquatic systems. In the presence of Fe(II), H2O2 represents a potential source of •OH via the Fenton reaction, which is commonly used in remediation for organic contaminant degradation. The degradation of various …
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Processes Affecting the Behavior of Redox-Sensitive Elements in Chesapeake Bay
… of the study was to establish whether estuarine redox reactions are controlled by a complex interaction of processes 1 to 3. Short-term and long-term studies were conducted in Chesapeake Bay. Redox species involved in redox cycling include oxygen, iron, manganese, hydrogen sulfide, nitrogen …
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Tailoring Isothermal Redox Properties of Calcium-based Perovskites
Perovskite structured (ABO3) redox materials are highly attractive for the advancement of a variety of sustainable processes such as Chemical Looping Combustion (CLC), thermochemical fuel production, etc. Apart from the state-of-the-art materials that require extreme synthesis and reaction …
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Investigation of the conversion of fuels in the presence of solid oxygen carriers and the development of a plasma-assisted chemical looping system for H2 production
… and the reactivity maintained high for three redox cycles. The energy cost of such PCLH was comparable to that of water electrolysis.
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The sources and cycles of iron and manganese in surface water supplies
Evaluation of the sources and cycles of water quality contaminants in watersheds is critical for effective surface water resource management. In particular, iron (Fe) and manganese (Mn), commonly found in rocks and sediments, have adverse impacts on water quality. However, controlling Fe and Mn in …
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The Chemodenitrification of Nitrate by Green Rust and Mackinawite and its Geochemical Implications
Soil minerals that can participate in the redox cycling of Fe(II)/Fe(III) have received a significant amount of attention over recent decades in terms of their capability to reduce contaminants. Although evidence has demonstrated that the biogeochemical coupling of Fe and N redox cycles has …
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Electroactive Conjugated Polymers as Charge-Transport Materials for Optoelectronic Thin-Film Devices
… a certain extent by the number of polymerisation redox cycles. It was shown from the electrochemical and photophysical properties of the triarylboranes 4–6 that the pi–pi-interaction between boron and nitrogen atoms is comparably weak in these molecules. This leads to an unexpected ground-state …
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Development and characterisation of a copper-based oxygen carrier for chemical-looping with oxygen uncoupling (CLOU)
… a transition metal and, to withstand many such redox cycles, it has to be supported on a suitable refractory oxide, with particles of the resulting construct being termed the "oxygen carrier". This Dissertation is concerned with the release and uptake of gaseous oxygen when Me is copper. In …
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Application of Chemical Looping for Solar Thermal Energy Storage
… storage media, through reduction and oxidation (RedOx) reactions. The RedOx reactions of multivalent metal oxides are based on Le Chatelier’s principle in which the spontaneous shift for rebalancing the reaction can be brought on by changing the temperature and/or pressure of the system. …
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Design and Modification of Polyazine-Bridged Ru(II),Rh(III) Bimetallic and Trimetallic Supramolecular Complexes Applicable in Solar Energy Harvesting for the Photocatalytic Reduction of Water to Hydrogen
… The ability of these systems to undergo multiple redox cycles, absorb light efficiently, populate photoreactive excited states, and collect electrons at a reactive Rh metal center fulfills the requirements for H₂O reduction photocatalysts. Photolysis of trimetallic or bimetallic complexes at 470 …
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Design and Synthesis of Mixed-Metal Supramolecular Complexes Incorporating Specialized Light Absorbing Units to Investigate Processes Relevant to Catalyst Function
… enantiomer of the LA subunit does not modify the redox behavior of Ru(II), Ru(II),Pt(II), or Ru(II),Rh(III),Ru(II) complexes. All of the mono-, bi-, and trimetallic complexes are efficient light absorbers throughout the UV and visible with π→π* intraligand (IL) transitions in the UV and …