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What is it?

Hydrogen is absorbed at low pressure into the metal hydride material, and subsequently released as a high-pressure gas via the application of heat.

Why is it important?

Metal hydride compressors present the possibility to use waste heat in place of electricity to drive compression.


  • Gravimetric hydrogen density: N/A
  • Storage conditions: High pressure (approaching 700 bar depending on application), ambient pressure storage, high temperatures required for hydrogen release


  • Simple design and operation
  • Minimal ongoing maintenance required
  • Potential to use waste heat in place of electricity to drive compression


  • Requires elevated temperatures to release hydrogen from metal hydride material
  • Low efficiency
  • High capital cost

RD&D priorities

  • Optimise hydride-forming alloys
  • Enable long-term reliable operation
  • Improve kinetics of hydrogen absorption/release at high efficiency
  • Improve stability to hydrogen impurities (e.g. water, CO2)
  • Improve system design and thermal management

Known active organisations

  • Curtin University
  • Deakin University
  • Griffith University
  • The University of New South Wales

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