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Showing 1 to 20 of 49 for “"Hydrogen evolution reaction"”.
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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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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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Experimental investigation of new coating methods for 3D-printed cathodes for hydrogen production
… a novel approach for preparing electrodes for hydrogen evolution reaction. A new approach where the electrolysis cathodes are 3D-printed and coated for alkaline water electrolysis. Copper, iron, and molybdenum are considered with nickel as coatings using electrodeposition. The results are …
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CuAg bimetallic nanoparticles for the electrochemical reduction of carbon dioxide
… reduction of carbon dioxide is a surface reaction, involving the conversion of carbon dioxide and water to hydrocarbons and oxygenates in an electrolytic environment. This reaction grants an opportunity for the rerouting of carbon dioxide from expulsion to the atmosphere towards the …
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Sonoelectrochemical (20 khz) production of hydrogen from aqueous solutions
There are various methods of producing Hydrogen. These include electrolysis, which this work is based upon, and steam reforming; currently the most commercially viable method. The research herein investigates methods of producing ‘green’ Hydrogen more efficiently by using ultrasound (20 kHz) …
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Synthesis and Catalytic Applications of Ni-Based Single-Atom and Nanoparticle Catalysts Supported on UiO-66-NH2
… was not achieved. Recognizing the necessity of hydrogen in CO₂ C1 conversion, we further tested the photocatalytic performance of the same material in hydrogen evolution reaction. Promising results were obtained in the samples where Ni was introduced into UiO-66-NH2 in ionic form, achieving …
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Nikelio ir jo lydinių katalizatorių charakterizavimas ir pritaikymas vandens skaldymo reakcijoje /
… for water splitting, targeting enhancements in hydrogen and oxygen production efficiencies. This study aligns with the 2020 European Union Hydrogen Strategy, which aims at promoting clean hydrogen technologies to bolster sustainable economic growth, diminish carbon emissions, and enhance energy …
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Reference Electrode Development in Polymer Electrolyte Membrane (PEM) Electrolyzer Assembly for Novel Investigation of Electrodes
… A second parametric study confirmed sufficient hydrogen polarization of the RE for operating conditions at low current density, low temperature, and low water feed rates. Application of the RE was successfully demonstrated through investigation of the oxygen evolution and hydrogen evolution …
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Bioelectrochemical Systems: Microbiology, Catalysts, Processes and Applications
… multiple functions such as energy generation, hydrogen production and/or desalination. The objectives of this dissertation are to understand the fundamental microbiology of BES, develop cost-effective cathode catalysts, optimize the process engineering and identify the application niches. It …
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Designing high performance overall water splitting electrocatalysts from non-precious metal selenides
… the continuous increasing demand for energy, the hydrogen, with the largest energy density stored in it, can then efficiently be used in fuel cells without concern of contaminants. Water splitting reaction to generate H<sub>2</sub> and O<sub>2</sub> is one promising method of converting solar …
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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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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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Bragg Coherent Diffraction Imaging of Metal Microcrystals Using a Multipurpose In Situ Cell Design
… understanding of their microstructural evolution under extreme conditions. In situ X-ray experiments offer a powerful means to investigate nanoscale defect evolution under reactor-relevant conditions. Bragg coherent diffraction imaging (BCDI), a synchrotron X-ray technique, enables …
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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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Advanced Electrochemical Analysis for Complex Electrode Applications
… (FTACV) have been utilised to examine these reactions. Chapter 3 reports the investigation of catechol oxidation and subsequent polymerisation through crosslinking with D-glucosamine or chitosan. Hydrogel can be formed on the electrode surface during the process, which changes the viscosity …
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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) …
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Performance and reliability studies of Atmospheric Plasma Spraying Raney nickel electrodes for alkaline electrolysers
… performance with low overpotential towards the hydrogen evolution reaction (HER). In comparison to the other electrode production methods APS is considered also to be relatively cheap. To our knowledge, this is the first time APS has been applied for the production of Raney nickel electrodes for …
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The Redox Reaction of Anhydrous Hbr For Hydrogen Production and Bromine Hydrogen Flow Battery
… externally and utilize redox electrode reactions for energy conversion. Therefore, highly reversible electrode reactions with good mass transfer are desired for improving its power density and efficiency. H2/H+ and Br2/Br-redox couples are known to own good reversibility, while discharge …
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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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Coupling electrolysis and surface patterning to improve onset of nucleate boiling and bubble departure in pool boiling heat transfer
… activation of bubble nucleation (via the hydrogen evolution reaction, HER) and engineering gold thin-strip microstructures fabricated on silicon substrates. The central hypothesis is that electrochemically generated hydrogen bubbles near the heating surface can significantly increase …
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