Jump to main content
Jump to site search

Remarkably Hydrogen Storage Properties of MgH2 doped by VNbO5


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.

Back to tab navigation

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
  •   Request permissions

    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

Search articles by author