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LiAlH4 Nanoparticles Encapsulated within Metallic Titanium Shells for Enhanced Hydrogen Storage.
- Source :
- ACS Applied Nano Materials; 11/25/2022, Vol. 5 Issue 11, p16413-16422, 10p
- Publication Year :
- 2022
-
Abstract
- Lithium aluminum hydride (LiAlH<subscript>4</subscript>) is considered as a promising hydrogen storage material due to its high gravimetric hydrogen storage density. However, sluggish hydrogen kinetics and poor reversibility have prevented its use in practical applications. Improvements of the hydrogen properties of LiAlH<subscript>4</subscript> have been proposed through a nanostructuring approach of the material. Herein, we developed a method to encapsulate freestanding LiAlH<subscript>4</subscript> nanoparticles within a Ti shell upon reduction of TiCl<subscript>3</subscript> at their surface. The LiAlH<subscript>4</subscript>@Ti core–shell nanostructures obtained through precise control in the reduction kinetics and the concentration of the Ti precursor led to a significant improvement in the dehydrogenation temperatures and desorption kinetics. Indeed, 5.8 mass % of hydrogen was released within 25 min at 150 °C from LiAlH<subscript>4</subscript>@Ti. More remarkably, the formation of the core–shell structure led to the disappearance of the well known exothermic decomposition path of LiAlH<subscript>4</subscript>, which evidenced the possibility of altering the hydrogen thermodynamics of LiAlH<subscript>4</subscript>. Partial hydrogen reversibility was observed at 150 °C and a 10 MPa hydrogen pressure, mainly because of the loss of the core–shell structure upon hydrogen cycling. However, this demonstrates that with finer control over the nanostructuring of LiAlH<subscript>4</subscript>, practical hydrogen storage conditions are within reach. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 25740970
- Volume :
- 5
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- ACS Applied Nano Materials
- Publication Type :
- Academic Journal
- Accession number :
- 160477978
- Full Text :
- https://doi.org/10.1021/acsanm.2c03483