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Showing 1 to 20 of 113 for “"Hydrogen evolution"”.
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Hydrogen evolution and transport in semiconductors
… The most common fabrication method for SOI is a hydrogen-induced cleavage technique in which ion-implanted hydrogen is employed to initiate and propagate cracks in a plane parallel to the silicon surface. Considerable research effort has been devoted to understanding this cleavage technique in …
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Hydrogen evolution and transport in semiconductors
… The most common fabrication method for SOI is a hydrogen-induced cleavage technique in which ion-implanted hydrogen is employed to initiate and propagate cracks in a plane parallel to the silicon surface. Considerable research effort has been devoted to understanding this cleavage technique in …
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Carbazole-based porous organic polymers for photocatalytic hydrogen evolution
… Microporous Polymer Films for Photocatalytic Hydrogen Evolution in the journal Advanced Materials. In the last part of this thesis a novel CPOP was introduced bearing an electron deficient triaryl borane core coupled to three carbazole groups. The resulting monomer proved to be highly emissive …
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Design and Mechanism Study of Electrocatalysts for Alkaline Hydrogen Evolution
The hydrogen evolution reaction (HER) is one of the most important and fundamental electrochemical processes in sustainable photo/electrochemical energy generation technologies. However, even after decades of study, the HER mechanism in neutral/alkaline media is still unclear and the slow kinetics …
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Electric Field Assisted Hydrogen Evolution Using Metallic Molybdenum Disulfide Catalysts
Hydrogen utilization is a prospective approach for alleviating the increasing global energy crisis and environmental pollution issues. Metallic phase molybdenum disulfide (MoS2) has emerged as a promising non-precious metal catalyst for hydrogen evolution reaction (HER). Numerous studies have …
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Macroporous Semiconductors Tantalum Oxide, (Oxy)nitride and Nitride for Photocatalytic Hydrogen Evolution
… is required. Perhaps the ideal clean fuel is hydrogen, which would be sustainable if it could be sourced efficiently from water. Photocatalysis using metal-semiconductor composites is potentially a feasible way to make use of solar energy to drive the water splitting reaction to product …
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Macroporous Semiconductors Tantalum Oxide, (Oxy)nitride and Nitride for Photocatalytic Hydrogen Evolution
… is required. Perhaps the ideal clean fuel is hydrogen, which would be sustainable if it could be sourced efficiently from water. Photocatalysis using metal-semiconductor composites is potentially a feasible way to make use of solar energy to drive the water splitting reaction to product …
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Ionic self-assembly of porphyrin micro-nano structures for solar hydrogen evolution
… metal nanocomposites for efficient solar H2 evolution. The project is composed of three inter-related tasks. The first task is to develop the synthetic methods for preparing the binary porphyrin micro-nano structures by ionic self-assembly under various aqueous solution conditions. Although …
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Molecular electrocatalysis of hydrogen evolution: catalytic design studied by density functional theory
… to gain mechanistic insight into molecular hydrogen evolving electrocatalysts. Reduction potentials and pKa’s were calculated for a variety of complexes with density functional theory in conjunction with appropriate experimental references in order to characterize the thermodynamics of the …
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Amine promotion of hydrogen evolution reaction suppression and CO2 conversion for artificial photosynthesis
… are chosen as ideal electrolytes to achieve both hydrogen evolution reaction suppression and lowering of CO2 reduction overpotential of. Experiments combining both electrochemical methods and surface enhanced Raman spectroscopy (SERS) techniques obtain a fairly complete picture of hydrogen …
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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 …
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Thermolysis Route for Accessing Amorphous Metal Sulfide Thin-Film Catalysts for the Hydrogen Evolution Reaction
… films on fluorine-doped tin oxide for the hydrogen evolution reaction (HER). Films prepared by dip-coating showed optimal coverage, as monitored by scanning electron microscopy, using high precursor solution concentrations and slow/fast dip-coating retraction rates with low/high volatility …
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Kinetics of hydrogen evolution and absorption during electrochemical reactions as determined by monitoring the volume of hydrogen bubbles
… H on an electrode which does not absorb hydrogen, and by using a hydrogen saturated solution, it is possible to calibrate the output e.m.f. These results are compared with those obtained using an electrode which does absorb hydrogen and this makes it possible to calculate the quantitative …
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Interaction of Na, O₂, CO₂ and water on MnO(100): Modeling a complex mixed oxide system for thermochemical water splitting
A catalytic route to hydrogen production via thermochemical water splitting is highly desirable because it directly converts thermal energy into stored chemical energy in the form of hydrogen and oxygen. Recently, the Davis group at Caltech reported an innovative low-temperature (max 850°C) …
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Titania-based nanocomposites for solar photocatalysis
… for photocatalytic water treatment and hydrogen evolution. For water treatment, TiO$_2$-C core-shell composites were prepared through controlled hydrolysis of titanium alkoxides followed by calcination in a non-oxygenating atmosphere. A total of nine TiO$_2$-C samples were synthesized by …
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Understanding and Improving Zinc Anodes for High-Energy Rechargeable Alkaline Batteries
… for air cathodes. Passivation, dissolution, hydrogen evolution reaction (HER), and dendrite formation are four reasons for irreversibility of zinc anodes in alkaline electrolytes. This thesis comprises three parts: material, mechanism, and device. From the aspect of material, four types of …
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Generating Small Molecule Fuels: (Photo)Electrochemical Catalysts
… catalysing production of a renewable fuel, hydrogen, or are capable of mediating the reduction of molecular nitrogen to ammonia, nitrogen fixation. Electrochemical analysis is used to measure the kinetic and mechanistic properties of the molecular catalysts used in this work. Semiconducting …
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Microstructure, stress and defect evolution under illumination in hydrogenated amorphous silicon (a-Si:H)
… the relation between microstructure, stress and hydrogen distribution in as deposited hydrogenated amorphous silicon (a-Si:H) layers, and secondly the investigation of the influence of illumination on hydrogen evolution and its relationship with the strain in illuminated layers.
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Zinc alloy powders for alkaline batteries
… into the alkaline solution and producing hydrogen gas as a byproduct. In the past, mercury was alloyed with zinc to slow down the corrosive process and prevent excessive hydrogen generation. Since mercury has been deemed as a health and environmental hazard, bismuth and indium are now used …
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