Dual-tuning the thermodynamics and kinetics: Magnesium-naphthalocyanine nanocomposite for low temperature hydrogen cycling |
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Authors: | Yahui Sun Kondo-Francois Aguey-Zinsou |
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Affiliation: | MERLin, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia |
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Abstract: | 2,11,20,29-Tetra-tert-butyl-2,3-naphthalocyanine (TTBNc) was used as an alternative host to support magnesium (Mg) nanoparticles. After deposition and decomposition of dibutylmagnesium on TTBNc, Mg nanoparticles of around 4 nm supported on TTBNc were observed by TEM. These TTBNc stabilized Mg nanoparticles were found to absorb hydrogen at 100 °C and release hydrogen from 75 °C. The Mg-TTBNc material showed good hydrogen cycling properties and structural stability. Kinetic measurements showed fast hydrogen absorption within 2 min at 150 °C. The hydrogen desorption kinetics were slower at the same temperature but faster at 250 °C with 80% of the hydrogen desorbed within 1 h. Enthalpy and entropy for hydrogen uptake and release in Mg-TTBNc determined from PCT measurements were found to be of 52.7 ± 4.9 kJ mol?1 H2 and 107.8 ± 9.4 J K?1 mol?1 H2, respectively. These values are much lower than those of bulk Mg. |
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Keywords: | Hydrogen storage Magnesium Naphthalocyanine Nanosizing Reversibility Thermodynamic |
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