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Magnesium Nanoparticles With Pd Decoration for Hydrogen Storage
Yana Liu1,2, Jinglian Zhu1,2, Zhibing Liu1,2
1College of Materials Science and Engineering, Nanjing Tech University, Nanjing, China.
Frontiers in Chemistry
|March 7, 2020
Summary
This study presents Magnesium-Palladium (Mg-Pd) nanocomposites for superior hydrogen storage. These Mg-Pd materials demonstrate enhanced hydrogen uptake and release kinetics at lower temperatures, making them promising for hydrogen energy applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Magnesium-based materials are attractive for hydrogen storage due to their high capacity.
- Improving the kinetics and thermodynamics of hydrogen absorption/desorption in magnesium hydrides remains a significant challenge.
- Nanostructuring and alloying are key strategies to enhance magnesium's hydrogen storage performance.
Purpose of the Study:
- To synthesize and characterize Magnesium-Palladium (Mg-Pd) nanocomposites for improved hydrogen storage.
- To investigate the effect of Palladium (Pd) decoration on Magnesium (Mg) nanoparticles for hydrogen sorption properties.
- To evaluate the hydrogenation and dehydrogenation kinetics and thermodynamics of the Mg-Pd nanocomposite.
Main Methods:
- Coprecipitation of Mg-Pd nanocomposites from tetrahydrofuran (THF) solution.
- Characterization of nanoparticle size (40-70 nm) and composition.
- Hydrogenation and dehydrogenation cycling to assess hydrogen storage capacity and kinetics.
- Differential Scanning Calorimetry (DSC) and other techniques to determine activation energies and phase transformations.
Main Results:
- Mg-Pd nanocomposites exhibited superior hydrogen storage properties compared to pure Mg.
- Onset dehydrogenation temperature was reduced to 216.8°C with an activation energy of 93.8 kJ/mol H2.
- The material achieved 3.0 wt% hydrogen uptake in 2 hours at 50°C, with a hydrogenation activation energy of 44.3 kJ/mol H2.
- Formation of high-content γ-MgH2 and Mg-Pd alloy phases enhanced desorption kinetics and destabilized MgH2.
Conclusions:
- Pd decoration significantly enhances the hydrogen storage performance of Mg nanoparticles.
- The Mg-Pd nanocomposite demonstrates improved hydrogenation and dehydrogenation kinetics and lower operational temperatures.
- The synergistic effects of nanostructuring, Pd alloying, and phase formation contribute to the enhanced reversible metal hydride transformation.
