Insights into an Amorphous NiCoB Nanoparticle-Catalyzed MgH2 System for Hydrogen Storage
Liuting Zhang1, Yan Zhang1, Fuying Wu1
1School of Energy and Power, Instrumental Analysis Center, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Inorganic Chemistry
|March 29, 2023
Summary
Amorphous NiCoB nanoparticles significantly enhance magnesium hydride (MgH2) hydrogen storage. This catalyst improves hydrogen absorption and release kinetics, reducing activation energy for practical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Magnesium hydride (MgH2) is a promising material for hydrogen storage due to its high hydrogen capacity.
- However, MgH2 suffers from poor kinetics and high operating temperatures, limiting its practical application.
- Developing effective catalysts is crucial to overcome these limitations.
Purpose of the Study:
- To synthesize amorphous NiCoB nanoparticles as catalysts for MgH2.
- To investigate the effect of NiCoB on the hydrogen storage properties of MgH2.
- To understand the catalytic mechanism for improved hydrogen de/absorption.
Main Methods:
- Amorphous NiCoB nanoparticles were synthesized using a simple chemical reduction method.
- The MgH2-NiCoB composite was prepared and tested for hydrogen absorption and desorption performance.
- Microstructure analysis was performed to understand the catalytic role of NiCoB.
Main Results:
- The MgH2-NiCoB composite exhibited rapid hydrogen absorption (3.6 wt% H2 at 85 °C) and release (5.5 wt% H2 below 270 °C).
- The hydrogenation activation energy was significantly reduced to 33.0 kJ·mol-1.
- In-situ generated MgB2, Mg2Ni/Mg2NiH4, and Mg2Co/Mg2CoH5 phases at the NiCoB surface facilitated hydrogen diffusion and destabilized Mg-H bonds.
Conclusions:
- Amorphous NiCoB nanoparticles act as highly effective catalysts for MgH2 hydrogen storage.
- The presence of NiCoB significantly improves the kinetics and reduces the activation energy of MgH2.
- This study offers a promising pathway for designing advanced Mg-based hydrogen storage systems.
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