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Fatima Z Tijent1,2,3, Montassar B Bouzourâa4, Vishnu Ottapilakkal1

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Researchers created hexagonal boron nitride (h-BN) bubbles for hydrogen storage using a UV laser. These stable bubbles offer high pressure and capacity, showing promise for long-term hydrogen fuel storage.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Storage

Background:

  • Hexagonal boron nitride (h-BN) bubbles show potential for micro-scale hydrogen storage due to their gas confinement properties.
  • Existing methods for h-BN bubble creation, requiring electron beams and vacuum, limit practical applications in hydrogen production setups.

Purpose of the Study:

  • To demonstrate a novel, practical method for creating h-BN bubbles using UV laser irradiation.
  • To characterize the properties and hydrogen storage capabilities of laser-induced h-BN bubbles.

Main Methods:

  • Formation of h-BN bubbles in a 20 nm h-BN film on a sapphire substrate using a 213 nm UV laser.
  • Atomic force microscopy (AFM) to analyze bubble size, density, and stability.
  • Measurement of internal pressure and gravimetric storage capacity.

Main Results:

  • h-BN bubbles up to 20 µm in size and higher density were formed with increased UV laser illumination time.
  • The created h-BN bubbles demonstrated remarkable stability, remaining intact for over 6 months.
  • A maximum internal pressure of 41 MPa and a gravimetric storage capacity of 6% were achieved.

Conclusions:

  • UV laser irradiation provides a practical and effective method for fabricating stable h-BN bubbles for hydrogen storage.
  • h-BN bubbles exhibit significant potential for efficient and long-term hydrogen gas confinement and storage applications.