The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides
| Autor: | Magnus Moe Nygård, Magnus H. Sørby, Bjørn C. Hauback, Arne Auen Grimenes |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Control and Optimization Materials science Hydrogen in situ synchrotron radiation powder X-ray diffraction 020209 energy Enthalpy Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Crystal structure lcsh:Technology hydrogen storage Metal Hydrogen storage Differential scanning calorimetry Desorption 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Engineering (miscellaneous) metal hydrides lcsh:T Renewable Energy Sustainability and the Environment 021001 nanoscience & nanotechnology activation energy for hydrogen desorption chemistry visual_art visual_art.visual_art_medium 0210 nano-technology Energy (miscellaneous) |
| Zdroj: | Energies Volume 13 Issue 11 Pages: 2874 'Energies ', vol: 13, pages: 2874-1-2874-11 (2020) Energies, Vol 13, Iss 2874, p 2874 (2020) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en13112874 |
| Popis: | Ti-V-based metal hydrides have decent overall performance as hydrogen storage materials, but V is expensive and it is therefore tempting to replace it by less expensive ferrovanadium containing about 20% Fe. In the present work we have investigated how Fe influences the structure and hydrogen storage properties of (Ti0.7V0.3)1−zFez alloys with e r r o r t y p e c e z ∈ { 0 , 0.03, 0.06, 0.1, 0.2, 0.3} using synchrotron radiation powder X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry and manometric measurements performed in a Sieverts apparatus. The alloys form body-centered cubic (bcc) crystal structures for all considered values of z, and the addition of Fe causes the unit cell to contract. When exposed to hydrogen gas, the bcc alloys form face-centered cubic (fcc) hydrides if e r r o r t y p e c e z ≤ 0 . 1 while other hydrogen-containing phases are formed for higher Fe-contents. The hydrogen capacities of the fcc hydrides at 20 bar are not significantly influenced by the addition of Fe and reach 3.2(3) wt% in (Ti0.7V0.3)0.9Fe0.1H1.6(2). For higher Fe contents the hydrogen capacity is decreased. The absorption kinetics are fast and the reactions are complete within minutes when the alloys are exposed to 20 bar H2 at room temperature. Increasing Fe content reduces the desorption enthalpy, onset temperature and activation energy. |
| Databáze: | OpenAIRE |
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