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Related Experiment Videos

Modified lithium borohydrides for reversible hydrogen storage.

Ming Au1, Arthur Jurgensen

  • 1Savannah River National Laboratory, Aiken, South Carolina 29808, USA. ming.au@srnl.doe.gov

The Journal of Physical Chemistry. B
|March 31, 2006
PubMed
Summary
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Researchers explored modifying lithium borohydrides for hydrogen storage. Additives lowered dehydrogenation temperatures and rehydrogenation pressures, improving reversibility for this advanced energy material.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Lithium borohydrides are promising for high-capacity hydrogen storage.
  • High dehydrogenation and rehydrogenation temperatures limit their practical application.
  • Developing reversible hydrogen storage materials is crucial for clean energy technologies.

Purpose of the Study:

  • To investigate the feasibility of reducing dehydrogenation temperatures and moderating rehydrogenation conditions for lithium borohydrides.
  • To explore the use of metal oxides and metal chlorides as additives to enhance hydrogen storage properties.
  • To understand the role of additives in the hydrogen release and absorption mechanisms.

Main Methods:

  • Modification of lithium borohydride via ball milling with various metal oxide and metal chloride additives.

Related Experiment Videos

  • Hydrogen release (dehydrogenation) and absorption (rehydrogenation) cycling experiments.
  • X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) for material characterization.

    • Main Results:

    • Modified lithium borohydrides released 9 wt % hydrogen starting at 473 K (reduced from 673 K).
    • Rehydrogenation occurred at 873 K and 7 MPa (milder than 923 K and 15 MPa).
    • An intermediate compound formed, facilitating lower temperatures and improved reversibility, though capacity decreased with cycling.

    Conclusions:

    • Additives effectively reduce dehydrogenation temperature and moderate rehydrogenation conditions for lithium borohydrides.
    • The formation of an intermediate compound is key to improved reversibility and lower operating temperatures.
    • Optimizing additive selection, loading, and synthesis methods is necessary to balance capacity, reversibility, and temperature requirements for practical hydrogen storage.