Solvation and Stabilization of Superior Alanate Nanostructures

Abstract

NaAlH4 and LiAlH4 are promising materials for hydrogen storage due to their high hydrogen density (7.4 and 10.5 mass%, respectively). However, their practical application is hampered from the slow hydrogen kinetics and poor reversibility. To improve the hydrogen properties of alanates, the alternative core–shell strategy has been proposed. In this respect, a simple solvent evaporation method is presented to synthesize the alanate core. In this approach, NaAlH4 and LiAlH4 are stabilized by solvation and electrostatic forces, respectively, through the addition of ionic salts. Remarkably, it is found that the size of the alanate nanoparticles can be tuned by varying the concentration of the introduced ion. More importantly, the partial substitution of Na+ and Li+ with cations of higher electronegativity enables the release of hydrogen at much lower temperatures.

Thermal‐to‐Electrical Conversion Based on Salinity Gradient Driven by Evaporation

“…In addition, a prominent absorption at 1605 cm −1 belonging to NaI was observed in the PVA–Na electrolyte, with the signal intensity of the covered portion being greater than the uncovered portion. [ 35 ] This observation indicates a higher NaI concentration in the covered part of the PVA–Na electrolyte. Further corroboration of this finding was provided by the EDS mapping of the SEM images.…”

Nanoscale engineering of solid-state materials for boosting hydrogen storage

“…221 The destabilization effect of the added ions was discovered to induce an exceptionally low hydrogen release temperature of ∼323 K from these stabilized NaBH 4 NPs. Using the same method, NaAlH 4 NPs, and LiAlH 4 NPs also enable the release of hydrogen at a much lower temperature of ∼323 K. 222…”