Catalytically enhanced hydrogen sorption in Mg-MgH2 by coupling vanadium-based catalyst and carbon nanotubes

Kadri, Atikah and Jia, Yi and Chen, Zhigang and Yao, Xiangdong (2015) Catalytically enhanced hydrogen sorption in Mg-MgH2 by coupling vanadium-based catalyst and carbon nanotubes. Materials, 8 (6). pp. 3491-3507.

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made available under Creative Commons Attribution License 4.0
Faculty / Department / School: No Faculty
Date Deposited: 09 Jun 2017 01:30
Last Modified: 09 Jun 2017 01:30
Uncontrolled Keywords: carbon nanotubes; hydrogen storage; magnesium hydride; vanadium complex catalyst; desorption temperatures; high-energy ball milling; hydrogen release; hydrogen sorption; magnesium hydride; onset temperature; synergistic effect; vanadium complexes; gas fuels; vanadium and alloys; machining operations; computer programming languages; nanotechnology; chemical operations; chemical products generally; fiber products; mixing and separation
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
03 Chemical Sciences > 0399 Other Chemical Sciences > 039999 Chemical Sciences not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.3390/ma8063491
URI: http://eprints.usq.edu.au/id/eprint/31686

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