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Mark Paskevicius1, Morten B Ley, Drew A Sheppard

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Investigating borohydride eutectic mixtures revealed lower melting points and unique hydrogen release behaviors. These molten phases exhibit diverse physical changes, including color shifts and frothing, offering new insights into hydrogen storage materials.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Chemical Engineering

Background:

  • Borohydrides are promising hydrogen storage materials.
  • Understanding their thermal behavior and decomposition is crucial for practical applications.
  • Eutectic mixtures can potentially lower operating temperatures and alter reaction pathways.

Purpose of the Study:

  • To investigate the thermal properties and melting behavior of various monometallic borohydride and borohydride eutectic mixtures.
  • To characterize the physical changes and hydrogen release during thermal ramping of these systems.
  • To explore the potential of eutectic mixtures for lower-temperature hydrogen storage applications.

Main Methods:

  • Thermal ramping analysis coupled with mass spectroscopy.
  • Differential scanning calorimetry (DSC) for thermal events.
  • Visual observation via photography to document physical changes.

Main Results:

  • Borohydride eutectic mixtures (e.g., LiBH4-NaBH4, LiBH4-KBH4) exhibited significantly lower melting points compared to monometallic phases, up to 167 °C lower.
  • Molten phases displayed varied physical phenomena including color changes, bubbling, frothing, and liquid-solid transitions during hydrogen release.
  • Hydrogen release from eutectic melts occurred at lower temperatures than from individual components.
  • Solid-state decomposition and reactions with impurities were observed in some systems, leading to bubbling or frothing.

Conclusions:

  • Eutectic mixtures of borohydrides offer a viable strategy to reduce melting temperatures for hydrogen storage applications.
  • The physical behavior of molten borohydride systems is complex and system-dependent, influencing hydrogen release characteristics.
  • Further research into impurity effects and controlled decomposition pathways is warranted for optimizing borohydride-based hydrogen storage.