INVESTIGADORES
TROIANI Horacio Esteban
artículos
Título:
Characterization of graphite catalytic effect in reactively ball-milled MgH2-C and Mg-C Composites
Autor/es:
FUSTER; CASTRO; TROIANI; URRETAVIZCAYA
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2011 p. 9051 - 9061
ISSN:
0360-3199
Resumen:
In the present work magnesium hydrogen sorption
kinetics of different graphite nanocomposites prepared by low-energy
ball milling is reported. A comparison is made between kinetic
performance in a Sievert-type apparatus of pure Mg, Mg + xG (x = 5, 10,
20 wt.%, G = graphite) composites and a mixture obtained by adding 10
wt.% G to MgH 2 already synthesized via reactive mechanical milling.
Moreover, the influence of two types of graphite morphology (flakes and
fine powder) is evaluated. In addition, thermal dehydriding properties
are analyzed by differential scanning calorimetry (DSC) measurements and
morphological and microstructural characteristics are determined by
X-ray diffraction (XRD), laser granulometry, BET surface analysis as
well as scanning and transmission electron microscopies (SEM and TEM)
for every material under study. Graphite catalytic effect is independent
of its morphology and is more pronounced when the additive is
incorporated from the beginning of milling, as well as in a higher
weight proportion. Furthermore, the additive preserves material
microstructure during a few hydriding and dehydriding cycles, i.e.
particle size distribution and crystallite enlargement, and as a result
kinetic properties remain practically unchanged. © 2011, Hydrogen Energy
Publications, LLC. Published by Elsevier Ltd. All rights reserved.