Publication: Kinetics Improvement Of Lithium Aluminium Hydride And 9- Ethylcarbazole Complex For Hydrogen Storage
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Date
2025-08
Authors
Liu, Huilin
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Abstract
Hydrogen storage remains a critical bottleneck in the realization of a
sustainable hydrogen economy. Lithium aluminum hydride (LiAlH4) and 9-
ethylcarbazole (NCZ) are two promising hydrogen storage materials due to their high
theoretical hydrogen capacities. However, their practical applications are limited by
the poor reversibility of LiAlH4 and the sluggish (de)hydrogenation kinetics of NCZ.
In this work, a novel composite system composed of LiAlH4 and NCZ in a 1:1 molar
ratio (denoted as LA–NCZ) was synthesized and investigated. The composite
exhibited a synergistic enhancement in hydrogen storage behavior: NCZ significantly
reduced the dehydrogenation temperature of LiAlH4, enabling rapid dehydrogenation
in a narrow temperature window between 150 °C and 160 °C. Differential scanning
calorimetry (DSC) revealed dehydrogenation peaks at lower temperatures compared
to pristine LiAlH4, and Kissinger analysis yielded significantly reduced apparent
activation energies of 36.76 ± 1.33 kJ/mol and 83.11 ± 2.87 kJ/mol for the first and
second steps, respectively. Interestingly, the dehydrogenation products of LiAlH4 (LiH
and Al) further promoted the hydrogenation rate and selectivity of NCZ, achieving a
hydrogen uptake of 5.6 wt% under 90 °C and 70 bar H2 with 5 wt% Ru catalyst, close
to the theoretical value of fully hydrogenated NCZ.
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Keywords
Kinetics Improvement Of Lithium Aluminium Hydride And 9- Ethylcarbazole Complex , Hydrogen Storage