2024-03-29T10:15:47Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/57792023-03-31T11:54:55Zcom_10259_4759com_10259_2604col_10259_4760
Remarkable hydrogen storage properties of MgH2 doped with VNbO5
Valentoni, Antonio
Mulas, Gabriele
Enzo, Stefano
Garroni, Sebastiano
Química física
Chemistry, Physical and theoretical
The present work concerns the catalytic effect of VNbO5, a ternary oxide prepared via a 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 1C for the un-doped sample (prepared and tested for comparison) to 235 1C for
the VNbO5-doped sample. Furthermore, more than 5 wt% of hydrogen can be absorbed in 5 minutes at
160 1C 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 good reversibility: over 5 wt% of
hydrogen with negligible degradation even after 70 consecutive cycles at 275 1C and 50 cycles at
300 1C. The kinetics analysis carried out by 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 estimating the thermodynamic stability of the system
and shed light on the additive role of VNbO5.
2021-05-24T09:40:47Z
2021-05-24T09:40:47Z
2018-02
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
1463-9076
http://hdl.handle.net/10259/5779
10.1039/c7cp07157d
1463-9084
eng
Physical Chemistry Chemical Physics. 2018, V. 20, n. 6, p. 4100-4108
https://doi.org/10.1039/C7CP07157D
info:eu-repo/semantics/openAccess
application/pdf
Royal Society of Chemistry
https://riubu.ubu.es/bitstream/10259/5779/3/Valentoni-pccp_2018.pdf.jpg
Hispana
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RIUBU. Repositorio Institucional de la Universidad de Burgos
http://hdl.handle.net/10259/5779