Hydriding/dehydriding properties of MgH2/5 wt.% Ni coated CNFs composite

Wu, C. Z., Yao, X. D. and Zhang, H. (2010) Hydriding/dehydriding properties of MgH2/5 wt.% Ni coated CNFs composite. International Journal of Hydrogen Energy, 35 1: 247-252. doi:10.1016/j.ijhydene.2009.10.079

Author Wu, C. Z.
Yao, X. D.
Zhang, H.
Title Hydriding/dehydriding properties of MgH2/5 wt.% Ni coated CNFs composite
Formatted title
Hydriding/dehydriding properties of MgH2/5 wt.% Ni coated CNFs composite
Journal name International Journal of Hydrogen Energy   Check publisher's open access policy
ISSN 0360-3199
Publication date 2010-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.ijhydene.2009.10.079
Volume 35
Issue 1
Start page 247
End page 252
Total pages 6
Place of publication Oxford, United Kindom
Publisher Pergamon
Collection year 2011
Language eng
Formatted abstract
In this paper, we reported that the prepared nickel coated carbon nanofibers (NiCNFs) by electroless plating method exhibited superior catalytic effect on hydrogen absorption/desorption of magnesium (Mg). It is demonstrated that the nanocomposites of MgH2/5 wt.% NiCNFs prepared by ball milling could absorb hydrogen very fast at low temperatures, e.g. absorb not, vert, similar6.0 wt.% hydrogen in 5 min at 473 K and not, vert, similar5.0 wt.% hydrogen in 10 min even at a temperature as low as 423 K. More importantly, the desorption of hydrogen was also significantly improved with additives of NiCNFs. Diffraction scanning calorimetry (DSC) measurement indicated that the peak desorption temperature decreased 50 K and the on-set temperature for desorption decreased 123 K. The composites also desorbed hydrogen fast, e.g. desorb 5.5 wt.% hydrogen within 20 min at 573 K. It is suggested that the new phase of Mg2Ni, and the nano-sized dispersed distribution of Ni and carbon contributed to this significant improvement. Johnson–Mehl–Avrami (JMA) analysis illustrated that hydrogen diffusion is the rate-limiting step for hydrogen absorption/desorption.
Copyright © 2009 Professor T. Nejat Veziroglu Published by Elsevier Ltd.
Keyword Hydrogen storage materials
Magnesium hydride
Ni coated CNFs
Ball milling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 17 November 2009.

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Created: Sun, 21 Feb 2010, 00:06:26 EST