Application of Mg–xwt%MmNi5(x=10–70) nanostructured composites in a hydrogen storage device

摘要: Abstract Large batches (800 g) of nanostructured Mg – x wt % MmNi 5 ( = 10 70 ) composites were prepared by ball milling elemental with in an attritor for 12 h under hydrogen atmosphere. There was no alloy formation between and within the times employed. The grain size composite varied from 28 to 45 nm, increasing content, whereas that constant at 12 nm, irrespective its concentration composite. BET surface area milled range 25 58 m 2 / g , increased content. absorption kinetics capacities these measured 100, 200 300 ∘ C 30 bar pressure on a small sample about 8 g. samples absorbed all temperatures, rate increases increase But rates decreased marginally temperature attained steady state less than 400 s even 100 . However, capacity followed content showing highest 5.1 wt%. has significant effect temperatures as low though hydride not present hydrogenated nanostructure together distribution surface/grain boundary appears have enhanced absorption, probably acting conduit diffusing into grain. performance storage device larger quantities (350–500 g) evaluated 150 supply 10–30 bar. quantity temperature. fraction α more 70% compositions up 30 but much lower higher MmNi5 behaviour same trend case testing smaller size.