Improvement of hydrogen storage kinetics in ball-milled magnesium doped with antimony

0473332 - ÚFM 2018 RIV GB eng J - Journal Article
Čermák, Jiří - Král, Lubomír - Roupcová, Pavla
Improvement of hydrogen storage kinetics in ball-milled magnesium doped with antimony.
International Journal of Hydrogen Energy. Roč. 42, č. 9 (2017), s. 6144-6151. ISSN 0360-3199. E-ISSN 1879-3487
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : Hydrogen * Hydrogen storage * Storage capacity * Magnesium alloys * Antimony
OECD category: Materials engineering
Impact factor: 4.229, year: 2017
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0360319916334012?via%3Dihub

Kinetics and dynamics of hydrogen storage are studied in magnesium based alloys Mg–Sb–C doped with 5, 13.3 and 21 wt.% of antimony at temperatures between 275 °C and 350 °C. Carbon is added in order to facilitate the ball milling. MgH2 hydride is the principal hydrogen storage phase in all studied alloys. It is found that antimony (i) significantly improves the kinetics of hydrogen sorption compared to hydrogen sorption in pure Mg, and (ii) after long-term ball milling Sb attains the high sorption capacity cmax, which approaches the maximum theoretical value of the pure MgH2 hydride, cth = 7.7 wt.% H2. The high value of cmax remains unchanged in the whole temperature interval from 275 °C to 350 °C. At the temperature of 350 °C, the 90% of cmax is (ab/de)sorbed typically within approximately 5 min starting with the second sorption cycle.
Permanent Link: http://hdl.handle.net/11104/0271241