Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion
| Autor: | Hideaki Iwaoka, Hoda Emami, Huaiyu Shao, Kaveh Edalati, Etsuo Akiba, Zenji Horita |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Supersaturation
Materials science Hydrogen Renewable Energy Sustainability and the Environment Metallurgy Alloy Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element Vanadium 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Hydrogen storage Fuel Technology chemistry engineering Grain boundary 0210 nano-technology Titanium |
| Zdroj: | International Journal of Hydrogen Energy. 41:8917-8924 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2016.03.146 |
| Popis: | Ti–V alloys thermodynamically absorb hydrogen at room temperature, but hydrogenation does not occur practically without a sophisticated activation process. In this study, a nanograined TiV alloy with the supersaturated bcc structure and an ultrahigh density of edge dislocations (>10 16 m −2 ) was mechanically synthesized from Ti and V powders using the high-pressure torsion (HPT) method. The presence of large fractions of grain boundaries and dislocations, as effective pathways for hydrogen diffusion, activated TiV and it absorbed ∼4 wt.% of hydrogen at room temperature after an incubation period. The kinetic measurements suggested that the hydrogen absorption in the incubation period is controlled by the slow rate of hydrogen dissociation, while the hydrogenation rate in the latter stage is controlled by diffusion of hydrogen atoms. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect