Yuping He and Yiping Zhao 2009 Nanotechnology 20 204008 doi:10.1088/0957-4484/20/20/204008
Yuping He and Yiping Zhao
Show affiliationsA 2.25 at.% V decorated Mg nanoblade array has been fabricated by a dynamic shadowing growth technique. It can absorb and desorb hydrogen rapidly at temperatures T>500 K after activation by one hydrogenation cycling, with low hydrogen absorption activation energy of 35.0 ± 1.2 kJ/mol H2 and desorption activation energy of 65.0 ± 0.3 kJ/mol H2. The saturated hydrogen content in Mg nanoblades decreases gradually with the number of cyclings, which is mainly caused by the formation and growth of Mg2Si hillock defects at the nanoblade/substrate interface even though a diffusion barrier layer consisting of a 500 nm Ti nanorod array and 500 nm Ti film was deposited between the Mg nanoblades and the Si substrate. The improved hydrogen sorption kinetics is attributed to both the catalytic effect of the V coating and the unique nanoblade morphology with large surface area and small hydrogen diffusion length.
81.16.-c Methods of nanofabrication and processing
84.60.-h Direct energy conversion and storage
68.35.Fx Diffusion; interface formation
61.46.-w Structure of nanoscale materials
81.07.-b Nanoscale materials and structures: fabrication and characterization
Issue 20 (20 May 2009)
Received 22 September 2008, in final form 18 November 2008
Published 23 April 2009
Yuping He and Yiping Zhao 2009 Nanotechnology 20 204008
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