From gangue to the fuel-cells application

Area of Science:

• Materials Science
• Energy Storage
• Nanotechnology

Background:

• Hydrogen is a promising clean energy carrier, but its storage presents challenges.
• Magnesium hydride (MgH2) offers high hydrogen density but requires improved kinetics and lower activation energy.
• Existing MgH2 materials need mechanical and chemical treatments for practical applications.

Purpose of the Study:

• To investigate the impact of doping mechanically-treated magnesium with amorphous Zr2Cu nanopowders.
• To enhance the hydrogen storage kinetics and cyclability of magnesium hydride.
• To utilize solid-waste metals for creating a novel nanocomposite hydrogen storage material.

Main Methods:

• Preparation of MgH2 and amorphous Zr2Cu alloy using reactive ball milling and arc melting.
• Doping of mechanically-treated Mg metal with 5 wt% amorphous Zr2Cu nanopowders.
• Evaluation of hydrogen storage capacity, kinetics, and cycling stability at 250 °C.

Main Results:

• A new nanocomposite system of MgH2 doped with amorphous Zr2Cu was successfully synthesized.
• The material achieved a high hydrogen storage capacity of 6.6 wt%.
• Superior hydrogen sorption/desorption kinetics and an extended cycle life of 1100 hours were observed.

Conclusions:

• Doping MgH2 with amorphous Zr2Cu nanopowders effectively improves hydrogen storage performance.
• The use of solid-waste metals presents a sustainable approach for developing advanced hydrogen storage materials.
• This nanocomposite demonstrates significant potential for practical hydrogen storage applications in the automotive and energy sectors.