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Materials 2015, 8(6), 3491-3507; doi:10.3390/ma8063491

Catalytically Enhanced Hydrogen Sorption in Mg-MgH2 by Coupling Vanadium-Based Catalyst and Carbon Nanotubes

1
Centre of Excellence for Functional Nanomaterials, the University of Queensland, St. Lucia, Brisbane, QLD 4067, Australia
2
Faculty of Chemical Engineering, Universiti Teknologi Mara (UiTM), Shah Alam, Selangor 40000, Malaysia
3
Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan, Brisbane, QLD 4111, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Umit Demirci
Received: 31 March 2015 / Revised: 2 June 2015 / Accepted: 4 June 2015 / Published: 12 June 2015
(This article belongs to the Special Issue Hydrogen Storage Materials)
View Full-Text   |   Download PDF [2347 KB, uploaded 12 June 2015]   |  

Abstract

Mg (MgH2)-based composites, using carbon nanotubes (CNTs) and pre-synthesized vanadium-based complex (VCat) as the catalysts, were prepared by high-energy ball milling technique. The synergistic effect of coupling CNTs and VCat in MgH2 was observed for an ultra-fast absorption rate of 6.50 wt. % of hydrogen per minute and 6.50 wt. % of hydrogen release in 10 min at 200 °C and 300 °C, respectively. The temperature programmed desorption (TPD) results reveal that coupling VCat and CNTs reduces both peak and onset temperatures by more than 60 °C and 114 °C, respectively. In addition, the presence of both VCat and CNTs reduces the enthalpy and entropy of desorption of about 7 kJ/mol H2 and 11 J/mol H2·K, respectively, as compared to those of the commercial MgH2, which ascribe to the decrease of desorption temperature. From the study of the effect of CNTs milling time, it is shown that partially destroyed CNTs (shorter milling time) are better to enhance the hydrogen sorption performance. View Full-Text
Keywords: hydrogen storage; magnesium hydride; carbon nanotubes; vanadium complex catalyst hydrogen storage; magnesium hydride; carbon nanotubes; vanadium complex catalyst
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kadri, A.; Jia, Y.; Chen, Z.; Yao, X. Catalytically Enhanced Hydrogen Sorption in Mg-MgH2 by Coupling Vanadium-Based Catalyst and Carbon Nanotubes. Materials 2015, 8, 3491-3507.

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