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MgH2@Mg(BH4)2 Core-Shell-like Nanostructures: Synthesis, Hydrolysis Performance, and Promotion Mechanism
Yongyang Zhu1,2, Liming Zeng1, Daifeng Wu1
1Institute of Resources Utilization and Rare Earth Development, State Key Laboratory of Rare Metals Separation and Comprehensive Utilization, Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangdong Academy of Sciences, Guangzhou 510650, P. R. China.
Nano Letters
|February 28, 2024
Summary
Magnesium hydride (MgH2) hydrolysis for hydrogen supply is improved by a MgH2@Mg(BH4)2 composite. This nanostructured material overcomes passivation issues, offering enhanced hydrogen release kinetics and yield.
Area of Science:
- Materials Science
- Chemical Engineering
- Renewable Energy
Background:
- Magnesium hydride (MgH2) is a promising material for on-site hydrogen generation due to its high storage capacity.
- However, practical application is limited by slow hydrolysis kinetics and low hydrogen yield, primarily due to the formation of a passivating magnesium hydroxide (Mg(OH)2) layer.
Purpose of the Study:
- To develop an improved MgH2-based material for efficient hydrogen production via hydrolysis.
- To overcome the kinetic limitations and passivation issues associated with MgH2 hydrolysis.
Main Methods:
- Synthesis of a core-shell-like nanostructured MgH2@Mg(BH4)2 composite using a dual strategy of microstructural design and compounding.
- Characterization of the composite's hydrolysis performance at room temperature.
Main Results:
- The optimal MgH2@Mg(BH4)2 composite exhibited a low activation energy (Ea) of 9.05 kJ mol-1.
- Achieved a high hydrogen yield of 2027.7 mL g-1 within 60 minutes.
- Demonstrated a significantly accelerated initial hydrolysis rate of 1356.7 mL g-1 min-1.
Conclusions:
- The nanocoating of Mg(BH4)2 on MgH2 enhances hydrolysis kinetics by releasing heat and creating localized Mg2+ concentration fields.
- The MgH2@Mg(BH4)2 composite presents an innovative and effective approach for designing advanced hydrolysis materials for hydrogen supply.
