RT info:eu-repo/semantics/article
T1 Remarkable hydrogen storage properties of MgH2 doped with VNbO5
A1 Valentoni, Antonio
A1 Mulas, Gabriele
A1 Enzo, Stefano
A1 Garroni, Sebastiano
K1 Química física
K1 Chemistry, Physical and theoretical
AB The present work concerns the catalytic effect of VNbO5, a ternary oxide prepared via a solid-stateroute, 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 bytemperature programmed desorption experiments, revealed a significant reduction of the desorptiontemperature from 330 1C for the un-doped sample (prepared and tested for comparison) to 235 1C forthe VNbO5-doped sample. Furthermore, more than 5 wt% of hydrogen can be absorbed in 5 minutes at160 1C under 20 bar of hydrogen, which is remarkable compared to the 0.7 wt% achieved for theun-doped system. The sample doped with 15 wt% of additive, showed good reversibility: over 5 wt% ofhydrogen with negligible degradation even after 70 consecutive cycles at 275 1C and 50 cycles at300 1C. The kinetics analysis carried out by Kissinger’s method exhibited a considerable reduction of theactivation energy for the desorption process. Finally, pressure-composition-isotherm experimentsconducted at three different temperatures allowed estimating the thermodynamic stability of the systemand shed light on the additive role of VNbO5.
PB Royal Society of Chemistry
SN 1463-9076
YR 2018
FD 2018-02
LK http://hdl.handle.net/10259/5779
UL http://hdl.handle.net/10259/5779
LA eng
DS Repositorio Institucional de la Universidad de Burgos
RD 24-nov-2024