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 132 for “"electrocatalysts"”.
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Metal oxide electrocatalysts for alternative energy technologies
… focuses on the development of metal oxide electrocatalysts with varying applications for alternative energy technologies. Interest in utilizing clean, renewable and sustainable sources of energy for powering the planet in the future has received much attention. This will address the growing …
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Multifunctional oxidation electrocatalysts for direct alkaline fuel cells
… limited due to the high costs associated with electrocatalysts needed for the corrosive environments in which proton-exchange membrane fuel cells operate. Electrocatalysts for such fuel cells are based on expensive noble metals such as platinum. Nevertheless, the resurging interest on the …
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Electrochemical Synthesis and Characterisation of Multimetallic Nanostructured Electrocatalysts
This thesis concerns investigations on novel multistage electrochemical deposition of nanostructured systems composed of noble metals platinum, ruthenium, and gold. Various electrochemical synthetic pathways were systematically explored producing multilayered nanoscale electrode systems composed of …
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Rational design strategies for oxide oxygen evolution electrocatalysts
Understanding and mastering the kinetics of oxygen electrocatalysis is instrumental to enabling solar fuels, fuel cells, electrolyzers, and metal-air batteries. Non-precious transition metal oxides show promise as cost-effective materials in such devices. Leveraging the wealth of solid-state …
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Amorphous Ni-based Alloys as Alkaline Oxygen Evolution Electrocatalysts
… through ball milling were studied as OER electrocatalysts and displayed enhanced activity over their crystalline counterparts on an intrinsic and geometric basis. Various techniques were employed to study surface, electronic, and structural properties of amorphous Ni-based alloys to …
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ELECTROCATALYSTS AND SUPPORTS FOR POLYMER FUEL CELLS AND ELECTROLYZERS
… work, we use high-throughput methods to screen electrocatalysts for CO2 electrolysis and alkaline hydrogen oxidation in hopes of discovering more active, cheaper catalyst than pure platinum group metals. A database of catalyst’s activities is compiled, and machine learning is applied to show how …
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Characterization of Platinum-Based Heterogeneous Electrocatalysts and Catalysis Modeling
After investigating current densities obtained from methanol oxidation, osmium apparently promoted the reaction on a platinum surface. However, osmium is a less effective promoter on a Pt(111) surface than ruthenium at low potentials, advantageous for fuel cell application.
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Electrocatalysts for the reduction of dioxygen and carbon dioxide
… research has focused primarily on generating electrocatalysts with improved activity and economic viability. Building on the prior ORR success of a carbon-supported binuclear copper complex of 3,5-diamino-1,2,4-triazole, the first section of this thesis focuses on four copper complexes built …
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Oxygen evolution mediated by co-based thin film electrocatalysts
The electrocatalytic conversion of water to O₂ is the key efficiency-determining reaction for the storage of electrical energy in the form of liquid fuels. In this thesis, the simple preparation of a cobalt-based catalyst for the oxygen evolution reaction (OER) is described and details of its …
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EXPLORATION OF TM-NX ORR ELECTROCATALYSTS FROM FIRST PRINCIPLE CALCULATIONS
… are TM-Nx (TM = Fe, Co, x = 2 - 4) based non-PGM electrocatalysts where the defect motifs are embedded in a carbon matrix during pyrolysis. By studying the material properties of individual defects we can determine how the chemistry and morphology of these TM-Nx motifs are interdependent. …
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Preparation characterisation and evaluation of core shell electrocatalysts for PEMFCs
… 1 introduces the PEM fuel cells, ORR electrocatalysts and the preparation and<br/>characterisation of core-shell type electrocatalysts. The experimental techniques,<br/>procedures and apparatus used for this work will be described in Chapter 2. The<br/>mechanism of the synthetic …
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Carbon nanotube supported electrocatalysts for polymer electrolyte membrane fuel cells
… This this research was aimed at a study of novel electrocatalysts for polymer electrolyte membrane (PEM) fuel cells. Carbon nanotubes have been studied as a new catalyst support. A sonochemical treatment method was applied for surface oxidation of multiwalled carbon nanotubes to achieve highly …
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Developing hydrogen oxidation electrocatalysts using a frustrated Lewis pair approach
… metals such as platinum are often employed as electrocatalysts, to enable the efficient conversion of hydrogen into electrical energy. However, the low abundance and high cost of such metals limits their economic viability. Frustrated Lewis pairs (FLPs) are capable of heterolytically cleaving …
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Design and Mechanism Study of Electrocatalysts for Alkaline Hydrogen Evolution
… unique alkaline HER mechanism on nanostructured electrocatalysts. So far, almost all studies on the alkaline HER mechanism are carried out using single/poly crystalline Pt as a model catalyst. However, it has been found that some of the mechanistic understandings drawn from the bulk model …
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Development of complex metal oxide electrocatalysts for oxygen evolution reaction
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Designing Electrocatalysts for the Production and Oxidation of Liquid Fuels
… has been invested in discovering new MOR electrocatalysts, PtRu has reigned for 5 decades, highlighting the need for a true breakthrough. In this thesis, electrocatalysts for OER and MOR are examined in depth. For OER, metal-hydroxide organic frameworks (MHOFs), a promising new class of …
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Ruthenium-Chromium Oxide Aerogels Oxygen Evolution Electrocatalysts: Structure, Activity and Stability
Hydrogen-based technologies have been the focus of extensive research to enable new processes of generating, converting, and storing energy in proton exchange membrane (PEM) water electrolyzers. Catalysts with enhanced activity and stability are needed for the anodic oxygen evolution reaction (OER) …
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Development of polyaniline nanotube electrocatalysts and sesor devices for phenolic-pollutants
As a source of life, water is one of the most precious commodities for all living organisms. Water resources are reported to be declining in numbers or the amount of water present and the existing onses are being polluted as a result of negligent human activities and intense industrialisation. …
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Energy Conversion Materials: Computational Design of Electrocatalysts Toward Sustainable Energy Applications
<p>As the global-scale need for sustainable energy technologies emerges due to anthropogenic climate change, electrocatalysis plays a crucial role in facilitating many sustainable processes. Several heterogenous cathode materials can perform different electrochemical activities using water, oxygen, …
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Glycerol Oxidation with Zeolite and Hierarchical Zeolite as Catalysts and Electrocatalysts
… The main drawback of zeolites as catalysts and electrocatalysts is the limited diffusivity inside the microporous system. An important part of the study was the development of different hierarchical zeolites to be used for the preparation of the modified electrodes. Thus, two series of …
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