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Processing Analysis of the Ternary LiNH2-MgH2-LiBH4 System for Hydrogen Storage

[+] Author Affiliations
Michael U. Niemann, Ashok Kumar, Elias K. Stefanakos, D. Yogi Goswami, Kimberly McGrath

University of South Florida, Tampa, FL

Sesha S. Srinivasan

Tuskegee University, Tuskegee, AL

Paper No. IMECE2009-11520, pp. 35-39; 5 pages
doi:10.1115/IMECE2009-11520
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 6: Emerging Technologies: Alternative Energy Systems; Energy Systems: Analysis, Thermodynamics and Sustainability
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4379-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

The ternary LiNH2 -MgH2 -LiBH4 hydrogen storage system has been extensively studied by adopting various processing reaction pathways. The stoichiometric ratio of LiNH2 :MgH2 :LiBH4 is kept constant with a 2:1:1 molar ratio. All samples are prepared using solid-state mechano-chemical synthesis with a constant rotational speed, but with varying milling duration. All samples are intimate mixtures of Li-B-N-H and MgH2 , with varying particle sizes. It is found that the samples with MgH2 particle sizes of approximately 10nm exhibit lower initial hydrogen release at a temperature of 150°C. The as-synthesized hydrides exhibit two main hydrogen release temperatures, one around 160°C and the other around 300°C. The main hydrogen release temperature is reduced from 310°C to 270°C, while hydrogen is first reversibly released at temperatures as low as 150°C with a total hydrogen capacity of 6 wt.%.

Copyright © 2009 by ASME

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