Reaction pathways for hydrogen desorption from magnesium hydride/hydroxide composites: bulk and interface effects

2010 ◽  
Vol 12 (3) ◽  
pp. 572-577 ◽  
Author(s):  
F. Leardini ◽  
J. R. Ares ◽  
J. Bodega ◽  
J. F. Fernández ◽  
I. J. Ferrer ◽  
...  
Keyword(s):  
Hydrogen Desorption ◽  
Magnesium Hydride ◽  
Reaction Pathways ◽  
Interface Effects

Influence of VO2 nanostructured ceramics on hydrogen desorption properties from magnesium hydride

2013 ◽  
Vol 39 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Sanja Milošević ◽  
Željka Rašković-Lovre ◽  
Sandra Kurko ◽  
Radojka Vujasin ◽  
Nikola Cvjetićanin ◽  
...  
Keyword(s):  
Hydrogen Desorption ◽  
Magnesium Hydride ◽  
Nanostructured Ceramics

Hydrogen desorption properties of magnesium hydride catalyzed multiply with carbon and silicon

2015 ◽  
Vol 645 ◽  
pp. S80-S83 ◽  
Author(s):  
Alicja Klimkowicz ◽  
Akito Takasaki ◽  
Łukasz Gondek ◽  
Henryk Figiel ◽  
Konrad Świerczek
Keyword(s):  
Hydrogen Desorption ◽  
Magnesium Hydride

Effect of V, Nb, Ti and graphite additions on the hydrogen desorption temperature of magnesium hydride

2012 ◽  
Vol 37 (2) ◽  
pp. 1912-1918 ◽  
Author(s):  
Hakan Gasan ◽  
Osman N. Celik ◽  
Nedret Aydinbeyli ◽  
Yasar M. Yaman
Keyword(s):  
Hydrogen Desorption ◽  
Magnesium Hydride ◽  
Desorption Temperature

scholarly journals In situ μ+SR measurements on the hydrogen desorption reaction of magnesium hydride

2014 ◽  
Vol 551 ◽  
pp. 012036 ◽  
Author(s):  
I Umegaki ◽  
H Nozaki ◽  
M Harada ◽  
Y Higuchi ◽  
T Noritake ◽  
...  
Keyword(s):  
Hydrogen Desorption ◽  
Magnesium Hydride ◽  
Desorption Reaction

scholarly journals Atoms and Nanoparticles of Transition Metals as Catalysts for Hydrogen Desorption from Magnesium Hydride

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
N. Bazzanella ◽  
R. Checchetto ◽  
A. Miotello
Keyword(s):  
Composite Materials ◽  
Transition Metal ◽  
Transition Metals ◽  
Hydrogen Desorption ◽  
Magnesium Hydride ◽  
Desorption Kinetics ◽  
Fast Diffusion ◽  
Desorption Process ◽  
Metal Additives ◽  
Kinetics Of

The hydrogen desorption kinetics of composite materials made of magnesium hydride with transition metal additives (TM: Nb, Fe, and Zr) was studied by several experimental techniques showing that (i) a few TM at.% concentrations catalyse the H2desorption process, (ii) the H2desorption kinetics results stabilized after a few H2sorption cycles when TM atoms aggregate by forming nanoclusters; (iii) the catalytic process occurs also at TM concentration as low as 0.06 at.% when TM atoms clustering is negligible, and (iv) mixed Fe and Zr additives produce faster H2desorption kinetics than single additive. The improved H2desorption kinetics of the composite materials can be explained by assuming that the interfaces between the MgH2matrix and the TM nanoclusters act as heterogeneous sites for the nucleation of the Mg phase in the MgH2matrix and promote the formation of fast diffusion channels for H migrating atoms.

scholarly journals Hydrogen desorption from nanostructured magnesium hydride composites

2007 ◽  
Vol 61 (2) ◽  
pp. 71-74
Author(s):  
Tanja Brdaric ◽  
Ljiljana Stamenkovic ◽  
Nikola Novakovic ◽  
Jasmina Grbovic-Novakovic
Keyword(s):  
Hydrogen Desorption ◽  
Morphological Characterization ◽  
Magnesium Hydride ◽  
Sem Analysis ◽  
Main Role ◽  
Desorption Peak ◽  
Additive Particles ◽  
Metal Addition ◽  
Thermal Stability Of ◽  
Metal Additive

The influence of 3d transition metal addition (Fe, Co and Ni) on the desorption properties of magnesium hydride were studied. The ball milling of MgH2-3d metal blends was performed under Ar. Microstructural and morphological characterization were performed by XRD and SEM analysis, while the hydrogen desorption properties were investigated by DSC. The results show a strong correlation between the morphology and thermal stability of the composites. The complex desorption behavior (the existence of more than one desorption peak) was correlated with the dispersion of the metal additive particles that appear to play the main role in the desorption. The desorption temperature can be reduced by more than 100 degrees if Fe is added as additive. The activation energy for H2 desorption from the MgH2-Fe composite is 120 kJ/mol, implying that diffusion controls the dehydration process.

scholarly journals Effects of Ball Milling and TiF3 Addition on the Dehydrogenation Temperature of Ca(BH4)2 Polymorphs

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4828
Author(s):  
Isabel Llamas Jansa ◽  
Oliver Friedrichs ◽  
Maximilian Fichtner ◽  
Elisa Gil Bardají ◽  
Andreas Züttel ◽  
...  
Keyword(s):  
Ball Milling ◽  
Hydrogen Desorption ◽  
Reaction Pathways ◽  
Desorption Peak ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Before And After ◽  
Kinetics Of ◽  
Desorption Reaction

The changes introduced by both ball milling and the addition of small amounts of TiF3 in the kinetics of the hydrogen desorption of three different Ca(BH4)2 polymorphs (α, β and γ) have been systematically investigated. The samples with different polymorphic contents, before and after the addition of TiF3, were characterized by powder X-ray diffraction and vibrational spectroscopy. The hydrogen desorption reaction pathways were monitored by differential scanning calorimetry. The hydrogen desorption of Ca(BH4)2 depends strongly on the amount of coexistent α, β and γ polymorphs as well as additional ball milling and added TiF3 to the sample. The addition of TiF3 increased the hydrogen desorption rate without significant dissociation of the fluoride. The combination of an α-Ca(BH4)2 rich sample with 10 mol% of TiF3 and 8 h of milling led to up to 27 °C decrease of the hydrogen desorption peak temperature.

Sign in / Sign up

Export Citation Format

Share Document