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Hydrogen storage in molecular compounds.

Wendy L Mao1, Ho-Kwang Mao

  • 1Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA. wmao@uchicago.edu

Proceedings of the National Academy of Sciences of the United States of America
|January 9, 2004
PubMed
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Researchers developed a novel hydrogen clathrate hydrate for energy storage. This crystalline compound efficiently stores hydrogen at low temperatures and high pressures, offering a promising new avenue for hydrogen fuel applications.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Crystalline molecular compounds formed at low temperature and high pressure can store gases.
  • Hydrogen storage is crucial for energy applications.

Purpose of the Study:

  • To synthesize and characterize a hydrogen clathrate hydrate for efficient hydrogen storage.
  • To investigate the stability and hydrogen release properties of the synthesized clathrate.

Main Methods:

  • Synthesis of hydrogen clathrate hydrate (H(2)(H(2)O)(2)) under high pressure (200-300 MPa) and low temperature (240-249 K).
  • Assessment of hydrogen storage capacity (50 g/L or 5.3 wt %).
  • Evaluation of clathrate stability at ambient pressure and low temperature (77 K).
  • Determination of hydrogen release temperature (140 K at ambient pressure).

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Main Results:

  • Successfully synthesized H(2)(H(2)O)(2) clathrate with high hydrogen storage density.
  • The clathrate is stable at 77 K and ambient pressure, releasing hydrogen at 140 K.
  • Extended stability fields for other molecular hydrogen compounds like H(2)(H(2)O) and (H(2))(4)CH(4) were observed at lower pressures and temperatures.

Conclusions:

  • Low-temperature molecular crystalline compounds show significant potential for hydrogen storage.
  • The synthesized hydrogen clathrate hydrate offers a viable method for storing and releasing hydrogen.
  • Further research into these compounds could lead to advanced energy storage solutions.