Fast hydrogen sorption kinetics of nanocrystalline Mg using Nb2O5 as catalyst

Barkhordarian, Gagik; Klassen, Thomas; Bormann, R.

doi:10.1016/s1359-6462(03)00259-8

Cited by 550 publications

(345 citation statements)

References 12 publications

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“…A number of techniques has been applied to improve the ab/desorption kinetics of MgH 2 , for example, ball-milling [9][10][11] with different additives e.g., transition metals (TM) [12][13][14] and transition metal oxides (TMO) [15][16][17][18][19][20]. The addition of niobia (Nb 2 O 5 ), in particular, has demonstrated an increase of reactivity in MgH 2 with respect to H 2 uptake/release [9,[21][22][23][24][25]. Recently, the interaction of hydrogen with MgH 2 in presence of ternary Mg-Nb oxides has been studied [26], suggesting a prominent effect for the system Mg 3 Nb 6 O 11 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of BaRuO3 addition on hydrogen desorption in MgH2

Baricco

Rahman

Livraghi

et al. 2012

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

“…An empirical rule suggests that TM atoms (Nb, Cr, W etc.) having multiple valence states in corresponding TMOs, show better reaction efficiency [7,21]. In addition, the interaction of H 2 with TMOs has drawn attention in order to understand their specific role on H 2 ab/desorption reactions in MgH 2 [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Effects of BaRuO3 addition on hydrogen desorption in MgH2

Baricco

Rahman

Livraghi

et al. 2012

Journal of Alloys and Compounds

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“…Recently, scientists found out that the composite of MgH 2 and transition metal compounds prepared by ball-milling showed improved kinetics for both hydrogen absorption and desorption [7]- [11], which can be seen as a good indicator for practical application. Barkhordarian et al reported that the Nb 2 O 5 had a superior catalytic effect for absorption and desorption, compared to other metal oxide catalysts.…”

Section: Introductionmentioning

confidence: 99%

Correlation between kinetics and chemical bonding state of catalyst surface in catalyzed magnesium hydride

Isobe

Morita

et al. 2011

International Journal of Hydrogen Energy

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We reported on the hydrogen desorption properties, microstructure, kinetics, and decreased, compared with that of the sample ball-milled for 0.02 h. TEM observations revealed that the distribution of Nb 2 O 5 in MgH 2 was gradually improved during ball-milling. On the other hand, we confirmed by XPS that in the sample ball-milled for 0.2 h, Nb 2 O 5-x phase(s) existed at least on the surface. It can be suggested that these deoxidized Nb 2 O 5-x phases eventually decrease E a as substantial catalyst rather than Nb 2 O 5 itself.

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“…One of the most interesting materials is magnesium hydride, which exhibits a high hydrogen storage capacity of 7.6 wt%. Absorption and desorption kinetics of hydrogen on MgH 2 are well known (Barkhordarian et al, 2003(Barkhordarian et al, , 2004Oelerich et al, 2001) as well as cycling and thermal stability (Huhn et al, 2005). The sorption properties are distinctly enhanced by high-energy ball milling and the addition of metal oxide additives, like Fe 2 O 3 , Nb 2 O 5 , TiO 2 and Cr 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Small-angle scattering investigations of magnesium hydride used as a hydrogen storage material

Pranzas¹,

Dornheim²,

Bösenberg³

et al. 2007

J Appl Cryst

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In this work, high‐energy ball‐milled magnesium hydride samples used for hydrogen storage are investigated using small‐ and ultra‐small‐angle neutron scattering (SANS) as well as small‐angle X‐ray scattering (SAXS). Size distributions of inhomogeneities with dimensions from 10 Å up to more than 10 µm, corresponding to crystallite and particle sizes obtained by X‐ray diffraction and electron microscopy, are determined as a function of milling time, milling tool material and added metal oxide catalysts in order to study the influence of the microstructure on the sorption kinetics. Significant changes of the volume fraction distributions are found for samples containing the catalyst chromium oxide, particularly when the catalyst particles are nanometre‐sized. Cr2O3 is an effective agent for breaking up particles during the milling process. The comparison of SANS and SAXS curves give some of the first information about the distribution of hydrogen‐containing structures. Using anomalous small‐angle X‐ray scattering, an energy‐dependent scattering is found for an MgHx sample with 1 mol% Fe2O3. From the separated scattering curve a size distribution of hard spheres is obtained with a size range which is expected for crystallite and particle sizes of the Fe2O3 catalyst. Chemical shifts in the absorption spectra give information about the stability of the metal oxide catalysts during the milling process.

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Fast hydrogen sorption kinetics of nanocrystalline Mg using Nb2O5 as catalyst

Cited by 550 publications

References 12 publications

Effects of BaRuO3 addition on hydrogen desorption in MgH2

Effects of BaRuO3 addition on hydrogen desorption in MgH2

Correlation between kinetics and chemical bonding state of catalyst surface in catalyzed magnesium hydride

Small-angle scattering investigations of magnesium hydride used as a hydrogen storage material

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