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 26 for “"Faradaic efficiency"”.
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Methodology for determining electronic transference numbers in molten sulfide melts
… extraction can be enhanced by increasing its faradaic efficiency, through, for example, decreasing the electronic transference number of the electrolyte. This thesis compares two methods of determining the electronic transference number in Cu2S - barium sulfide (BaS) electrolytes to determine …
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Novel electrode fabrication and reactor design for electrocatalytic nitrate and nitrite reduction in drinking water treatment
… materials to improve NO₃⁻ reduction activity, Faradaic efficiency, and selectivity for N₂ or NH₄⁺ end products. The first project explores the design of a scalable parallel-plate thin-layer (as known as filterpress) flow reactor with potential control, and the reactor performance for …
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Integrative Approach to Metal Extraction and Electrification
… of the system was found to be sensitive to the faradaic efficiency of the system and the electrical conductivity of the electrolyte. The faradaic efficiency of the system and the electrical conductivity of the electrolyte was experimentally determined over a range of operating conditions. The …
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Technoeconomic Analysis and Design of CO₂ Capture and Conversion Systems
… of the reactor is validated with a 47% Faradaic Efficiency towards C₂H₄ at 200mA/cm².
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Electrochemical and spectroscopic insights into the electroreduction of carbon dioxide to value added chemicals
… All three Cu-based electrodes exhibit high Faradaic efficiency (FE) of CO2 reduction toward C2H4 production. The CuSn-DAT electrode exhibits the highest FE for CO (~90% at -0.4 V) and C2H4 (~60% at -0.8 V) production and high current density (~-225 mA/cm2). In situ Surface Enhanced Raman …
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Catalysts and electrodes for the electroreduction of carbon dioxide to useful chemicals
… due to high overpotentials which reduce energy efficiency, low current densities and low selectivities. Better catalysts that show high activity as well as electrodes that exhibit excellent mass transfer capabilities and electron conductivities are needed. This dissertation reports the …
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DEVELOPMENT OF NEW METHODOLOGIES AND PRACTICES TO REDUCE THE ENVIRONMENTAL IMPACT IN THE PRODUCTION OF CERAMIC MATERIALS
… the first time, a scientific assessment of the faradaic efficiency of hydrogen generation from real wastewater containing organic contaminants using non-precious electrodes. To overcome the limitations of electrochemical oxidation alone, a hybrid process integrating visible-light-active BiOCl …
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Probing the Role of Amines in Aqueous Electrochemical Reduction of Captured-state CO₂
… and pKₐ and evaluated each on the basis of Faradaic efficiency, partial current density to reduced products, and the dynamics of product formation on Ag-based electrocatalysts. Through these measurements, we elucidate trends in the competition of hydrogen evolution and carbon monoxide …
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Electrochemical Alkene Epoxidation Using Water as the Oxygen Source
… safety concerns. To improve the safety and efficiency of epoxide production, there is a need for new methods that can overcome these limitations and enable the production of epoxides in a more sustainable and safe manner. From this perspective, this thesis work explores electrochemical …
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Electrocatalytic Oxygen and Nitrate Reduction Reactions Using Cu-Based Electrodes
… to increase the current density and NH 3 Faradaic efficiency. Lastly, we discuss the future prospect of this electrocatalytic NRR using different fluoropolymers instead of Nafion and propose methods to increase the durability of the catalysts.
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Towards Sacrificial Anode-Free Alkyne Electrocarboxylation
… graphite anode, and Bu₄NI in MeCN, achieved a Faradaic efficiency (FE) of 44%. This result exceeds the highest FE achieved with sacrificial anodes reported in the literature (37%) to date. However, assessment of the electrolyser stability highlighted the challenges of prolonged batch …
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Microfluidic platform for studying the electrochemical reduction of carbon dioxide
… of the effects of reaction temperature on the Faradaic efficiency and current density for CO2 reduction on several catalysts (Chapter 7). These studies demonstrate the utility of this flexible reactor design and provide increased understanding of the electrochemical reduction of CO2 and the …
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Development of a lithium-mediated nitrogen reduction process
… cm⁻² s⁻1 (8.8 mA cm⁻²) was obtained; the highest Faradaic efficiency for ammonia obtained was 47.5%. Hydrogen oxidation at >25 mA cm⁻² and 100% FE was demonstrated. A technoeconomic model for a general, large-scale electrochemical ammonia production process was developed and was applied to …
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Defining Key Engineering Parameters to Advance Electrochemical CO₂ Separation Technologies
… performance descriptors (e.g., energetic efficiency, faradaic efficiency, and separation capacity or flux) whose complex interplay convolutes determination of the optimal design space. To address this, my research focuses on developing modeling frameworks to better understand the …
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Interrogating electrocatalytic mechanisms and developing nano-porous catalysts for energy conversion reactions: I. Oxygen evolution reaction, and II. Carbon dioxide reduction reaction
… exhibit the best CO2 reduction activity with a Faradaic efficiency (FE) of the C2H4 product formation reaching 41% at -0.47 V vs. RHE, a FE for C2H5OH formation reaching 22% at -0.55 V vs. RHE, and a mass activity for CO2 reduction at -0.65V vs. RHE of ~ 720 A/g. In Chapter 6, I present our …
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Development of Reactor Technology for the Photoelectrolysis of Seawater
… oxidation with the latter exhibiting higher faradaic efficiencies of ~ 60 % under UV illumination. A propeller reactor system has been developed for application as a photoanode in a PEC setup within a stacked frame photo reactor design. Firstly, the propeller was designed and optimised for …
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Tailored diketopyrrolopyrrole-based organic dyes in photoelectrochemical cells for solar fuel synthesis
… sustained over a 26 hour period with high faradaic efficiency. This work demonstrates the construction of stable precious metal-free dye-sensitised photoanodes, capable of outperforming precious metal-based systems. The photoanode was then wired to a biohybrid cathode modified with the …
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Oxocarbon-derived porous carbonaceous materials for electrocatalysis
… activity in glycerol oxidation, achieving high Faradaic efficiency and selectivity, superior to many other Cu-based catalysts, which suggested the promising utilization as a catalyst for converting byproducts into valuable formic acid.
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Mechanistic Underpinnings of Efficient Chemical-to-Electrical Energy Interconversion in Bipolar Membranes
… the fundamental processes that control the efficiency of chemical-to-electrical energy interconversion in BPMs remain poorly understood, both under open-circuit conditions and under polarization. Hence, the overarching goal of the work in this thesis is to identify these processes and …
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Design and characterization of catalysts and electrodes for electrochemical energy conversion applications
… exhibiting both higher activity and higher Faradaic efficiency for CO production. The 160 mA/cm2 partial current density for CO production achieved for this supported gold catalyst is to date the highest performance reported under ambient conditions. Such high activity can be attributed to …
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