Boron nitride porous microbelts for hydrogen storage

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Layered boron nitrides (BNs) are recognized for their protective and reinforcing properties.
• The gas sorption capabilities of BNs, particularly for hydrogen, remain underexplored.

Purpose of the Study:

• To synthesize and characterize a novel porous boron nitride material for gas sorption applications.
• To investigate the hydrogen storage potential of this new BN material.

Main Methods:

• One-step template-free synthesis using a boron acid-melamine precursor and ammonia.
• Characterization via high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectroscopy.
• Hydrogen (H₂) sorption evaluation at 77 K and 1 MPa.

Main Results:

• A novel porous boron nitride (BN) microbelt material was synthesized with a record specific surface area of 1488 m²/g.
• The material exhibits a partially disordered structure, an enlarged interlayer spacing (0.38 nm), and an intermediate phase between hexagonal and amorphous BN.
• Tunable textures were achieved by varying synthesis temperatures.
• High and reversible hydrogen uptake ranging from 1.6 to 2.3 wt % was observed at 77 K and 1 MPa.

Conclusions:

• The developed porous BN microbelts possess exceptional surface area and unique structural characteristics.
• These materials show promising potential for efficient hydrogen storage applications.
• The synthesis method offers a route to tunable porous BN structures for advanced material applications.