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Showing 1 to 14 of 14 for “"Hydrogen Desorption"”.
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Hydrogen desorption and absorption for activated magnesium hydride
… studied to determine the resultant effects on hydrogen desorption and absorption kinetics for potential use as a hydrogen storage material. It is found that the addition of LiBH4 in small molar ratios results in improved kinetics of the same order as those observed for mechanically milled …
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Hydrogen in Austenite: What Changes after Martensitic Transformation?
Diffusible hydrogen in steels can cause embrittlement. Hydrogen has much lower diffusivity in austenite than in ferrite. Therefore, austenite is relatively immune to embrittlement. However, the poor stability of austenite can lead to martensitic transformation. And martensite cannot dissolve all …
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Computational and Experimental Studies of Coherence and Energy Flow in Microscopic and Mesoscopic Systems
The dynamics of STM based hydrogen desorption at silicon surfaces is another process in which an open systems approach is appropriate. Therefore, we adopt a master equation model previously applied to this problem, and propose resonant IR overtone excitation of the surface Si-H vibration as a …
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Growth of silicon(1-x) germanium(x) from disilane and digermane by gas-source molecular beam epitaxy
… with the rate-limiting step being first-order hydrogen desorption from the surface monohydride. The hydrogen desorption activation energy for Si and Ge surfaces were found to be 2.04 eV and 1.56 eV, respectively. The zero-coverage reactive sticking probability in the impingement-flux-limited …
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B-incorporation kinetics and charge transport property of silicon germanide(001) layer grown by GS-MBE from silicon hydride, germanium hydride, and boron hydride
… with the rate-limiting step being first-order hydrogen desorption from Si and Ge monohydride for which the activation energy is 2.04 and 1.56 eV, respectively. The zero-coverage reactive sticking probability of $\rm Si\sb2H\sb6$ on Si(001)2 x 1 ($\rm Ge\sb2H\sb6$ on Ge(001)2 x 1) in the …
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Electrochemical Hydrogen Absorption by Zr-Cu-Al-Ni Metallic Glasses
Effect of electrochemical absorption of hydrogen has been studied on the Zr-based amorphous alloys. The influence of hydrogen absorption on the stability of the amorphous phase and its crystallisation was investigated. Additionally, the cathodic hydrogen reaction mechanism on the surface of the …
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Development of a Hydrogen Producing Thermal Control for Chemical Hydrogen Storage
… thesis investigated a potential improvement to hydrogen storage for fuel cells using a thermally efficient hydrogen storage method. The efficiency of the storage system was improved using a metal hydride system to act as a thermal control unit for an exothermic chemical hydrogen storage system. …
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Thermodynamics and kinetics of hydrogen storage in magnesium hydride: a theoretical study of catalyst-dopant, defect, and size effects
… persists: Is there a means to enhance the hydrogen desorption/adsorption properties of this “simple” hydride by decreasing size (e.g., creating nano-sized particles by ball-milling) and/or adding catalyst dopants? Thus, we need to determine accurately both the enthalpy and kinetic barriers …
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Hydrogen embrittlement resistance in advanced high strength: vanadium bearing and TRIP-assisted steels
… damage, these lead to failure especially when hydrogen enters the lattice and gets trapped in defects. It is desired to design advanced steels highly resistant to hydrogen embrittlement (HE), while preserving a balance between their superior strength and ductility. For this purpose, a new …
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CARBON STRUCTURES AND Mg-BASED MATERIALS FOR GAS SORPTION
Hydrogen is an alternative energy carrier for both mobile and stationary applications, which can effectively alleviate greenhouse gas emissions and reduce dependence on fossil fuels. The other promising approach in reducing greenhouse gas emissions is carbon capture. Mgbased materials have been …
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Surface modification of hydrogen-terminated silicon nanoparticles.
Abstract not available.
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Multi-component ab2 metal hydride alloys for nickel metal hydride battery applications
… Zr/Ni ratio increased, the maximum gaseous phase hydrogen storage capacity increased but maximized at Zr : Ni = 9 : 11. Comparing the properties before and after annealing, it was clear that the natures of constituent phases influenced the gaseous phase storage. The highest full discharge capacity …
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Understanding toughness and ductility in novel steels with mixed microstructures
… of austenite is lost in a superbainitic steel. Hydrogen thermal desorption techniques are applied to this problem, inspired by the tendency of such alloys to undergo tensile failure with limited or zero necking. The striking result sheds light on the importance of austenite morphology in …
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Direct 3D and in situ characterization of light metal hydrides for hydrogen storage
… environmental impact have generated interest in hydrogen as a sustainable energy carrier. Developing effective hydrogen storage for automotive applications is a central challenge in realizing a hydrogen energy economy. Light metal hydrides possess high storage capacities, but sluggish hydrogen …