Improved hydrogen storage properties of a V decorated Mg nanoblade array.

Area of Science:

• Materials Science
• Nanotechnology
• Hydrogen Storage

Background:

• Magnesium (Mg) based materials are promising for hydrogen storage.
• Improving the kinetics of hydrogen absorption and desorption in Mg is crucial for practical applications.

Purpose of the Study:

• To enhance the hydrogen sorption kinetics of magnesium nanoblades.
• To investigate the effect of vanadium (V) coating on Mg nanoblade hydrogen storage properties.

Main Methods:

• Fabrication of Mg nanoblades.
• Coating Mg nanoblades with an ultra-thin layer of vanadium using dynamic shadowing growth.
• Hydrogen absorption and desorption cycling at elevated temperatures.

Main Results:

• Achieved rapid hydrogen absorption and desorption at temperatures >= 500 K.
• Determined low activation energy for hydrogen absorption (35.0+/-1.2 kJ/mol H2) and desorption (65.0+/-0.3 kJ/mol H2).
• Demonstrated improved kinetics attributed to vanadium's catalytic effect and nanoblade morphology.

Conclusions:

• Vanadium coating significantly improves hydrogen sorption kinetics of Mg nanoblades.
• The nanoblade morphology offers a large surface area and short diffusion path, further aiding kinetics.
• This V-decorated Mg nanoblade system shows potential for efficient hydrogen storage applications.