Mg nanoparticles (NPs) with addition of Ti catalysts were synthesised by inert gas condensation and in situ hydrogenation at 150 °C. The NPs size and composition were systematically investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy and powder X-ray diffraction (PXD), while time resolved in situ synchrotron radiation-PXD was used to monitor the mechanism for hydrogen uptake and release at 280 °C. The Mg–Ti NPs reveal activation energies of 68 kJ mol−1 for absorption and 78 kJ mol−1 for desorption by isothermal kinetics analysis, similar to the lowest values reported in the literature for MgH2 using Nb2O5 as a catalyst. Hence, hydrogen desorption (pdes = 8 mbar) and absorption (pabs = 260 mbar) is achieved at 200 °C in ∼2000 s, while keeping 5.3 wt% storage capacity. Thermodynamic data extracted from van ’t Hoff plots reveal unchanged values compared to bulk MgH2. Therefore, the improved hydrogen storage performances are assigned to the enhanced kinetics only.

Calizzi, M., Chericoni, D., Jepsen, L.H., Jensen, T.R., Pasquini, L. (2016). Mg–Ti nanoparticles with superior kinetics for hydrogen storage. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 41(32), 14447-14454 [10.1016/j.ijhydene.2016.03.071].

Mg–Ti nanoparticles with superior kinetics for hydrogen storage

CALIZZI, MARCO;CHERICONI, DOMIZIA;PASQUINI, LUCA
2016

Abstract

Mg nanoparticles (NPs) with addition of Ti catalysts were synthesised by inert gas condensation and in situ hydrogenation at 150 °C. The NPs size and composition were systematically investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy and powder X-ray diffraction (PXD), while time resolved in situ synchrotron radiation-PXD was used to monitor the mechanism for hydrogen uptake and release at 280 °C. The Mg–Ti NPs reveal activation energies of 68 kJ mol−1 for absorption and 78 kJ mol−1 for desorption by isothermal kinetics analysis, similar to the lowest values reported in the literature for MgH2 using Nb2O5 as a catalyst. Hence, hydrogen desorption (pdes = 8 mbar) and absorption (pabs = 260 mbar) is achieved at 200 °C in ∼2000 s, while keeping 5.3 wt% storage capacity. Thermodynamic data extracted from van ’t Hoff plots reveal unchanged values compared to bulk MgH2. Therefore, the improved hydrogen storage performances are assigned to the enhanced kinetics only.
2016
Calizzi, M., Chericoni, D., Jepsen, L.H., Jensen, T.R., Pasquini, L. (2016). Mg–Ti nanoparticles with superior kinetics for hydrogen storage. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 41(32), 14447-14454 [10.1016/j.ijhydene.2016.03.071].
Calizzi, Marco; Chericoni, Domizia; Jepsen, Lars H.; Jensen, Torben R.; Pasquini, Luca
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/586249
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