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.
Results
Showing 1 to 20 of 23 for “"Hydrogen Oxidation"”.
-
Developing hydrogen oxidation electrocatalysts using a frustrated Lewis pair approach
In order for hydrogen to be utilised as an energy vector, precious 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. …
-
SiC and B₄C as electrocatalyst support materials for low temperature fuel cells
… economically feasible platinum metal loadings in hydrogen polymer electrolyte fuel cells (PEFCs). High surface area carbons are commonly utilised as support materials for platinum due to low cost, large surface areas and high conductivity. However, PEFCs using this technology undergo oxidation of …
-
Combustion and pollutant characteristics of IC engines fueled with hydrogen and diesel/hydrogen mixtures using 3D computations with detailed chemical kinetics
… formation in a spark ignition engine fueled with hydrogen. Advanced simulations were performed using multi- dimensional software AVL FIRE coupled with CHEMKIN. The detailed chemical reactions with 29 steps of hydrogen oxidation with additional nitrogen oxidation reactions were also employed. …
-
Exploring Electrochemical Properties of Ti-Containing Oxides as Anodes for SOFCs
… evaluation for their catalytic activity towards hydrogen oxidation reaction (HOR). Among the samples investigated, K1.54Mg0.77Ti7.23O16 showed the highest electrical conductivity of 2 S/cm at 800 oC in H2. In order to evaluate catalytic activity towards HOR, symmetrical cells were constructed on …
-
ELECTROCATALYSTS AND SUPPORTS FOR POLYMER FUEL CELLS AND ELECTROLYZERS
… storage are carbon neutral hydrocarbons and a hydrogen energy economy. The main hurdle in implementing these technologies is the cost of electrolyzers/fuel cells along with the overhaul of our current energy infrastructure. To mitigate the cost of the electrolyzers and fuel cells, cheaper, more …
-
Hydrogenase of Clostridium acetobutylicum ATCC 824
… that produces acetic and butyric acids, hydrogen gas, and carbon dioxide during the exponential phase of growth. When the culture pH is allowed to remain near 4.5, the metabolism switches to the production of the neutral compounds (solvents) - acetone, n-butanol, and ethanol. The two …
-
Study of Faradaic Reactions Occurring At Polycrystalline Platinum Electrode Surfaces in Frozen, Aqueous Acidic Electrolyte
… different Tafel plot acquisition methods for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), hydrogen oxidation reaction (HOR), and oxygen reduction reaction (ORR) at polycrystalline Pt (Pt(poly)) in frozen and liquid aqueous H2SO4 electrolyte. The compared methods are: (i) …
-
High-throughput synthesis and screening of binary alloys for hydrogen evolution and oxidation reactions
… ºC for 15 minutes) binary metal alloys for the hydrogen evolution reaction (HER) and the hydrogen oxidation reaction (HOR). Results are presented for the Pd-Au, Pd-Bi and Ru-Au alloy systems. Thin films of each alloy system were synthesized on a series of 10x10 array electrodes with a graded …
-
Metatranscriptomic analysis of community structure and metabolism of the rhizosphere microbiome.
… plant polymer degradation, nitrogen fixation, hydrogen oxidation, methylotrophy and antibiotic production. These functions were also more highly expressed in rhizospheres than soil. Microbes also induced functions involved in chemotaxis, motility, attachment, pathogenesis, responses to …
-
Development of a lithium-mediated nitrogen reduction process
… and fossil fuels are used to make nitrogen and hydrogen, which are then reacted at elevated temperatures and pressures to produce NH₃. The use of fossil fuels as a hydrogen and energy source leads to significant CO₂ emissions. In addition, the process is very centralized and capitally intensive, …
-
Growth of Opportunistic Pathogens in Domestic Plumbing: Building Standards, System Operation, and Design
… The organic carbon fixed by autotrophic hydrogen oxidation has the potential to facilitate OP growth, but more work is needed to understand the limits of this mechanism. Finally, well-controlled laboratory experiments confirmed past reports from field surveys that the use of chloramines …
-
Non-precious metal catalysts prepared by chemical functionalization of carbon surfaces.
… friendly sources are being investigated. Hydrogen fuel cells are a way to combine both an effective method of power supply, converting chemical energy into electrical energy directly, and a way to employ clean energy. Fuel cells involve the use of platinum (Pt) as a catalyst, for both the …
-
Production of a soluble hydrogenase from R. Eutropha H16
Hydrogenases are metalloenzymes that reversibly catalyse the oxidation or production of molecular hydrogen (H2) and are generally classified by the structure of the catalytic site. From a biotechnology perspective, hydrogenases have been extensively studied with a view to their potential …
-
Catalyst Layer Design in Polymer Membrane Fuel Cells
… of this work was to integrate new Ni-based hydrogen oxidation reaction (HOR) catalysts into alkaline MEAs. A large part of this objective was designing a reproducible protocol for making these MEAs. From this work it was concluded that within the catalyst layer the amount of ionomer plays a …
-
TIMELESS QUESTIONS AND MODERN CHALLENGES: A JOURNEY FROM THE ORIGIN OF LIFE IN HYDROTHERMAL VENTS TO ELECTROCHEMICAL CO2 REDUCTION
… by coupling the CO2 reduction (CO2R) and the hydrogen oxidation (HOR), thus generating the very first organic molecule on Earth. The behaviour of HTVs can be modelled as a “short-circuited fuel cell”: in this system, H2 and CO2 in the respective environment serve as fuels and the two …
-
Incorporation of cyanide ligands into models of [FeFe]- and [NiFe]-hydrogenase
Hydrogen is processed in Nature by a class of metalloenzymes called hydrogenases. Hydrogenase enzymes catalyze the reduction of protons into H2 or oxidized H2 into protons. The catalytic rates and overpotentials of hydrogenase enzymes are comparable to Pt catalysts. The most prevalent hydrogenase …
-
Electrochemical Pathways to Decarbonizing Urea and Ammonia Production
… H₂ and N₂ as feed gases. This approach decouples hydrogen oxidation at the anode and nitrogen reduction at the cathode, eliminating the need for sacrificial donors. The system incorporated nickel-based anodes, optimized electrolytes for reversible metal plating, and in-situ Raman spectroscopy for …
-
Reactions at coordinated ligands: redox-active ligands and coordination of Lewis acids
… with a primary interest in reactivity with dihydrogen. The main thrust of the work has been the investigation of redox-active ligands in which redox occurs at the ligand. Redox-active ligands have been generally a curiosity in organometallic chemistry and have only recently been realized in …
-
Oxidation of benzene in supercritical water : experimental measurements and development of an elementary reaction mechanism
Supercritical water oxidation (SCWO) typically refers to a waste treatment or remediation process and derives its effectiveness from the unique solvent properties of water above its critical point. When organic compounds and oxygen are brought together in water well above its critical point of 221 …
-
SYNTHESIS AND CHARACTERIZATION OF NEW ELECTROCATALYTIC MATERIALS TO IMPROVE THE PERFORMANCE, OPERABILITY AND LIFE-TIME OF PEMFCS
… oxygen reduction reaction (ORR), methanol or CO oxidation. What’s more, the support materials can also influence the durability of the catalysts. The development of promising and new catalyst surports, therefore, is significantly vital for improving the electrochemical activities and stabilities …
Page 1 of 2