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Showing 1 to 20 of 34 for “"Hydrogen Evolution Reaction (HER)"”.
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Theoretical investigations of Metal-N4-Graphene and Metal-C3N4 catalysts for CO2 reduction
… (CO2RR) in preference to generating H2 in HER on Me-N4-doped Graphene/ Carbon Nanotube and Me-C3N4 catalysts. We find that for Me-N4-doped Graphene / Carbon Nanotube systems, there exists a scaling relation between the adsorption energies of *H and *COOH, the intermediates of hydrogen …
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Thermolysis Route for Accessing Amorphous Metal Sulfide Thin-Film Catalysts for the Hydrogen Evolution Reaction
In this work, low temperature thermolysis of metal ethyl xanthates (M = Mo, Co, Fe, Ni) was used to prepare amorphous metal and mixed metal sulfide films on fluorine-doped tin oxide for the hydrogen evolution reaction (HER). Films prepared by dip-coating showed optimal coverage, as monitored by …
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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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Designing high performance overall water splitting electrocatalysts from non-precious metal selenides
… of the environment have motivated researchers for pursuing transition away from fossil fuels to renewable solar-fuels. Therefore, in order to meet the continuous increasing demand for energy, the hydrogen, with the largest energy density stored in it, can then efficiently be used in fuel …
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Understanding and Improving Zinc Anodes for High-Energy Rechargeable Alkaline Batteries
… generally feature better intrinsic safety, higher ionic conductivity and lower cost compared with flammable organic electrolytes. Metallic zinc as a rechargeable anode material for aqueous batteries has gained tremendous attention with merits of intrinsic safety, low cost, and high theoretical …
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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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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
… PhD main aim was the examination of the Atmospheric Plasma Spraying Raney nickel electrodes samples with strong emphasis on electrochemical characterisation and investigation of the degradation/deactivation mechanisms which occur within the electrodes structure. Nowadays research in alkaline …
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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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Synthesis, characterisation, and properties of powder metallurgy transition metal-based high entropy alloys for electrocatalytic application
Water electrolysis is an eco-friendly route for hydrogen production when compared to other routes such as steam reforming, coal gasification, biomass gasification etc, however only 4% of hydrogen is being produced through water electrolysis. Water electrolysis proceeds via two half-cell reactions …
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The Development of Novel Electrochemical Sensors Based on Innovative Materials
… efficient catalysts are engineered for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In particular, dual-laser writing techniques enable the direct fabrication of 3D graphene–transition metal dichalcogenide hybrid architectures, exhibiting remarkable catalytic …
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The Role of Surface Coverage of Reaction Intermediates in Heterogeneous Electrocatalysis
The population of reaction intermediates is intimately related to the kinetic landscape and the overall rate of any multi-step reaction. For efficient interconversion of chemical and electrical energy, it is critical to understand the role of catalyst surface coverage and how it relates to two …
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Synthesis and Electrocatalytic Properties of Structure Engineered First-Row Transition Metal Derivatives
Hydrogen is a green energy carrier, producing only water when combusted, and a hydrogen economy has been considered the ideal green economy for human society. Water electrolysis can produce high-purity hydrogen on a large scale, and if the electricity used in water electrolysis is obtained from …
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Revealing Interfacial Reactions and Charge Transfer Kinetics in Electrochemical Energy Storage and Conversion
… devices to complete the sustainable eco-system, where Li-ion batteries and fuel cells promise a bright future. Batteries and fuel cells also play essential roles in electrifying transportation in replacement of internal combustion engines. Central to these electrochemical systems is the …
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Reaction Condition Dependence of Different Overpotential Components in Electrochemical Hydrogen Catalysis
… an applied or measured overpotential. However, there are many ways to generate non-equilibrium conditions, and correspondingly overpotential can arise from multiple different sources. Thus, the applied overpotential in an electrocatalytic system is always the aggregate of different overpotential …
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Carbazole-based porous organic polymers for photocatalytic hydrogen evolution
… strong organic oxidant like DDQ is applied, further polymerization on a single carbazole group is possible. Depending on the amount and reaction time a polymer with higher rigidity and improved CO2 gas uptake results. Avoiding any metal-based oxidative agent, the dimer coupled polymer with …
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Non-Precious Metal-Based Electrocatalysts from Prussian Blue Analogues for Energy-Related Reaction
Developing efficient electrocatalysts for oxygen evolution reaction (OER), oxygen reduction reaction (ORR), hydrogen evolution reaction (HER) and biomass oxidation is of great significance for green and renewable energy technologies, such as metal-air batteries, fuel cells, hydrogen production and …
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