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Remarkably Hydrogen Storage Properties of MgH2 doped by VNbO5

Abstract

The present work concerns the catalytic effect of VNbO5, a ternary oxide prepared by solid-state route, on the sorption performance of MgH2. Three doped systems, namely 5, 10 and 15 wt. % VNbO5-MgH2 have been prepared by ball milling and thoroughly characterized. Hydrogen sorption, evaluated by temperature programmed desorption experiments, revealed a significant reduction of the desorption temperature from 330 °C for the un-doped sample (prepared and tested for comparison) to 235 °C for the VNbO5-doped sample. Furthermore, more than 5 wt. % of hydrogen can be absorbed in 5 minutes at 160 °C under 20 bar of hydrogen, which is remarkable compared to the 0.7 wt. % achieved for the un-doped system. The sample doped with 15 wt.% of additive, showed a good reversibility: over 5 wt. % of hydrogen with a negligible degradation even after 70 consecutive cycles at 275 °C and 50 cycles at 300 °C. The kinetics analysis carried out by the Kissinger’s method exhibited a considerable reduction of the activation energy for the desorption process. Finally, Pressure-Composition-Isotherm experiments conducted at three different temperatures allowed to estimate the thermodynamic stability of the system and shed light on the additive role of VNbO5.

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Publication details

The article was received on 21 Oct 2017, accepted on 04 Jan 2018 and first published on 05 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP07157D
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Remarkably Hydrogen Storage Properties of MgH2 doped by VNbO5

    A. Valentoni, G. Mulas, S. Enzo and S. Garroni, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP07157D

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