Synthesis of NaAlH<inf>4</inf>/Al composites and their applications in hydrogen storage
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© 2018 Hydrogen Energy Publications LLC In solid-state hydrogen storage in light metal hydrides, nanoconfinement and the use of catalysts represent promising solutions to overcoming limitations such as poor reversibility and slow kinetics. In this work, the morphology and hydrogen desorption kinetics of NaAlH4 melt-infiltrated into a previously developed Ti-based doped porous Al scaffold is analysed. Small-angle X-ray scattering and scanning electron microscopy analysis of low NaAlH4 loading in the porous Al scaffold has revealed that mesopores and small macropores are filled first, leaving the larger macropores/voids empty. Temperature-programmed desorption experiments have shown that NaAlH4-infiltrated porous Al scaffolds show a higher relative H2 release, with respect to NaAlH4 + TiCl3, in the temperature range 148–220 °C, with the temperature of H2 desorption trending to bulk NaAlH4 with increasing scaffold loading. The Ti-based catalytic effect is reproduced when the dopant is present in the scaffold. Further work is required to increase the mesoporous volume in order to enhance the nanoconfinement effect.
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Javadian, P.; Sheppard, Drew; Buckley, C.; Jensen, T. (2016)Nanoconfinement of 2LiBH4-NaAlH4 into a mesoporous carbon aerogel scaffold with a pore size, BET surface area and total pore volume of Dmax = 30 nm, SBET = 689 m2/g and Vtot = 1.21 mL/g, respectively is investigated. ...
Sofianos, Veronica; Sheppard, Drew; Ianni, E.; Humphries, Terry; Rowles, Matthew; Liu, S.; Buckley, C. (2017)A novel approach for confining LiBH4 within a porous aluminium scaffold was applied in order to enhance its hydrogen storage properties, relative to conventional techniques for confining complex hydrides. The porous ...
Ianni, Enrico (2018)Due to its thermodynamic, hydrogen specific weight, and volumetric properties, NaAlH4 is a promising candidate to store hydrogen for vehicular applications. However, NaAlH4 suffers from slow hydrogen absorption/desorption ...