Artículo
Hydrogen absorption and desorption properties of Mg/MgH2 with nanometric dispersion of small amounts of Nb(V) ethoxide
Ojeda, Xavier A.; Castro, Facundo
; Pighin, Santiago Alberto
; Troiani, Horacio Esteban
; Moreno, Mario Sergio Jesus
; Urretavizcaya, Guillermina
Fecha de publicación:
19/01/2021
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
International Journal of Hydrogen Energy
ISSN:
0360-3199
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A study to determine the optimal content of Nb(V) ethoxide required to efficiently catalyze the H2 sorption kinetics in the Mg/MgH2 system is reported. The materials were synthesized by hand mixing different amounts of additive (from 0.10 to 1 mol%) to pre-milled MgH2. Considering kinetics and capacity the best performance corresponds to a 0.25 mol% of Nb ethoxide concentration. With this material, a remarkable kinetic behavior with excellent reversibility is obtained: 5.3 wt% and 5.1 wt% of hydrogen are absorbed and desorbed respectively at 300 °C in 3 min. At 250 °C the material absorbs 5.2 wt% of hydrogen and releases 3.7 wt% in 10 min. Thermal desorption starts at 247 °C and peaks at 268 °C. The H2 sorption properties of all the materials remain unchanged after 10 cycles of absorption and desorption at 300 °C, and the best material reversibly takes in and releases 5.3 wt% of H2 during a 10 min combined cycle. The kinetic improvement of the hydrogen desorption and absorption properties is attributed to an enhancement of the kinetic processes that occur on the surface of the material, due to the excellent spreading of the liquid additive at nanometric level, as revealed by SEM/EDS and TEM/EELS.
Palabras clave:
HYDROGEN STORAGE
,
KINETICS
,
NIOBIUM ALKOXIDE
,
TEM/EELS
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Ojeda, Xavier A.; Castro, Facundo; Pighin, Santiago Alberto; Troiani, Horacio Esteban; Moreno, Mario Sergio Jesus; et al.; Hydrogen absorption and desorption properties of Mg/MgH2 with nanometric dispersion of small amounts of Nb(V) ethoxide; Pergamon-Elsevier Science Ltd; International Journal of Hydrogen Energy; 46; 5; 19-1-2021; 4126-4136
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