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 25 for “"Hydrogen adsorption"”.
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Hydrogen Adsorption-Absorption by Niobium
Made available in DSpace on 2015-05-12T22:38:45Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7207653.PDF: 2039396 bytes, checksum: d77763dfb97306f1419bbd35172fbe78 (MD5) Previous issue date: 1971
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Neutron scattering studies and simulations of hydrogen adsorption in single-walled carbon nanotubes
The storage of hydrogen is one of the main problems that needs to be solvedbefore hydrogen can become a real alternative to oil in mobile applications.Physisorption of hydrogen in an adsorbate is one of the possible solutions tothis problem.This thesis studies the adsorption of hydrogen in …
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Quantum Monte Carlo Study of Hydrogen Adsorption on Carbon and Transition Metal Systems
… has successfully carried out a QMC study of hydrogen adsorption on Ti-ethylene molecular systems demonstrating reversible hydrogen adsorption on molecular TiH$_2$C$_2$H$_4$. This system is chosen as representative of larger carbon-transition-metal systems that may be relevant for practical …
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Hydrogen Cryosorption of Micro-Structured Carbon Materials
In comparison with the high-pressure adsorption at room temperature, hydrogen adsorption at cryogenic temperatures can be significantly improved at low pressures, which has great potential for prospective mobile applications. In this study, a differential pressure based manometry system was …
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Hydrogen dissociative adsorption on pipeline steels in high-pressure gaseous environments
Hydrogen is acknowledged as a key player in energy transition and the pursuit of achieving the net-zero target. Pipeline can serve as an ideal transportation method for H2 due to its high efficiency, large capacity, and relatively low cost. However, H2 pipelines are facing the problem of Hydrogen …
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High-speed electrochemistry using ultramicroelectrodes
… acid adsorbed on mercury, reductive hydrogen adsorption on platinum and double layer charging. (e) A study of the smallest available time constants was performed, taking into account non-idealities in the electrode such as stray capacitance and resistance of the electrode itself. This …
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Investigation of Pd-Ti and Ni-Ti Multilayer Thin Films for Enhanced Hydrogen Storage Capacity
… of compact and secure storage solutions for hydrogen in solid-state materials presents significant challenges and demands. High-capacity storage technologies that operate effectively at low pressures and exhibit favourable kinetics in absorption and desorption are essential for hydrogen …
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Simulations of the hydrogen storage capacities of carbon materials
… been proposed for efficient storage of molecular hydrogen for fuel cell applications. However, despite intense research efforts, so far, the industrial parameters of 6.5% mass ratio and 62 kg/m3 volume density are still questionable though the results are obtained by either experimentally or via …
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En route towards advanced catalyst materials for the electrocatalytic water splitting reaction
… elucidation of their activity towards the hydrogen (and oxygen) evolution reaction. The Sabatier principle has been used as the principal guideline towards successful tuning of catalytic sites. Furthermore, two pathways have been chosen to ameliorate the electrocatalytic performance, …
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Sustainable Mechanochemical Synthesis and Manufacturing of Metal-Organic Frameworks for Enhanced Hydrogen Storage
… the need for sustainable and efficient hydrogen storage solutions to replace fossil fuels is becoming increasingly urgent. This thesis investigates sustainable mechanochemical processing routes for metal-organic frameworks (MOFs), focusing on enhancing the hydrogen storage performance of …
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Strain-balanced silicon-germanium materials for near IR photodetection in silicon-based optical interconnects
… (UHV-CVD) is presented and the role of adsorbed hydrogen during UHV-CVD growth is addressed. Hydrogen adsorption 0,1 the growth surface proved a useful technique to minimize coherent strain relaxation at the higher growth temperatures required for UHV-CVD silicon-germanium growth. The near IR …
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Synthesis and characterization of rigid nanoporous hypercrosslinked copolymers for high surface area materials with potential hydrogen storage capabilities
Hydrogen storage remains a major technological barrier to the widespread adoption of hydrogen as an energy source. Organic polymers offer one potential route to useful hydrogen storage materials. Recently, Frechet and his coworkers described a series of hypercrosslinked polymers with high surface …
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Catalytic coatings for vanadium-based hydrogen membranes
… alternative to palladium as a dense metallic hydrogen membrane. However, catalytic surface coatings must be applied to vanadium surfaces to enable the transport of molecular hydrogen. These coatings facilitate dissociation and recombination kinetics of molecular hydrogen and protect vanadium …
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Investigation of surface structures at catalytically important metals by UHV - electron spectroscopic and electrochemical methods
… acid was also established. An asymmetric hydrogen region was found and a reversible surface reaction at the positive side of the double layer region was obtained. The general voltammetric evolution during multiple cycling was explained by perchlorate reduction and adsorption-desorption of …
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Effect of Pt Particle Size and Electronic Properties on the Hydrogenation of Ethylene
The hydrogenation of ethylene to ethane is a widely studied model reaction to investigate catalytic mechanisms. This reaction was historically regarded as structure-insensitive, until recent studies revealed that minor variations in the metal cluster size can affect both the geometric and …
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Investigation of hydrogen chemisorption on the tungsten (100) surface
… properties associated with the chemisorption of hydrogen on a single crystal tungsten (100) surface over a temperature range from 600c to -1500C. A new hydrogen binding state, labeled the fast state, has been observed and characterized using ESD techniques. This state is desorbable if the undosed …
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An investigation of electrochemical techniques in acoustic environments
… that the “drop off” is not caused by the hydrogen peroxide production at the electrode or pH change near the electrode surface. However, a clear dependence of the current deflection on the roughness factor of the electrodes is observed. The shape of the “drop off” followed the shape of the …
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Square-wave voltammetry detection for capillary electrophoresis
… detect other electrode processes such as analyte adsorption to develop a more generally applicable CE detection method. Using SWV, changes in the background electrolyte response were observed as organic analytes exited the capillary and interacted with a Pt electrode. Initially, for non-aromatic …
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