Hydrogen Sorption Kinetics

Flowever, a true catalytic effect is most probably present in transition-metal doped magnesium. A proof of this is the fact that nanostructured catalyst gives enhanced sorption properties compared to its micro-sized counterparts [226-229]. Hanada et al. also showed that after milling the catalyst is homogeneously distributed on a nanometer scale [230]. A possible interpretation of the catalytic effect may be the appearance of ternary magnesium-niobium oxides, which was evidenced by TEM [229, 231] and neutron diffraction [232]. Despite the abundant literature on 

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Huot, J., G. Liang, S. Boily, A.V. Neste, and R. Schulz, Structural study and hydrogen sorption kinetics of ball-milled magnesium hydride, /. Alloys Compd., 293-295, 495-500, 1999. 

N.E. Tran, S.G. Lambrakos, M.A. Imam, Analyses of hydrogen sorption kinetics and thermodynamics of magnesium-misch metal alloy, J. Alloys Compd. 407 (2006) 240-248. 

J. Dufour, J. Huot, Rapid activation, enhanced hydrogen sorption kinetics and air resistance in laminated Mg-Pd 2.5at.%, J. Alloys Compd. 439 (2007) L5-L9. 

G. Barkhordaiian, T. Klassen, R. Bormann, East hydrogen sorption kinetics of nanocrystalline Mg using Nb Oj as catalyst, Scripta Mater. 49 (2003) 213-217. 

N. Hanada, T. Ichikawa, S. Hino, H. Eujii, Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb Oj, J. Alloys Compd. 420 (2006) 46 9. 

R. Janot, L. Aymard, A. Rougier, et ah, Fast Hydrogen Sorption Kinetics for Ball-Milled Mg2Ni Alloys,/. Physics Chem. Solids, 2004, 65 (2-3), 529. 

Recently, several authors have reported first results on the hydrogen sorption properties of magnesium (hydride) nanostructures with different shapes, such as wires, platelets and spheres grown from the vapor phase [65-67]. In general, the hydrogen sorption kinetics were very fast compared to bulk, non-catalyzed magne-... 

A. Borgschulte, U. Bosenberg, G. Barkhordarian, M. Domheim and R. Bormann, Enhanced hydrogen sorption kinetics of magnesium by destabilized MgH2-s, Catal. Today 120 (2007) 262-269. 

Barkhordarian, G., Klassen, T. and Bormann, R. (2003) Fast hydrogen sorption kinetics of nanocrystalline Mg using Nb205 as catalyst, Scripta Materialia, 49, 213-217. 

Hjort, R, Krozer, A. and Kasemo, B. (1996) Hydrogen sorption kinetics in partly oxidized Mg films, Journal of Alloys and Compounds, 237, 74-80. 

Huot J, Liang G, BoUy S, van Neste A and Schulz R (1999), Structural study and hydrogen sorption kinetics of ball-miUed magnesium hydride, J. Alloys Compounds, 293, 495-500. 

The doping of hydrides with carbon shows an improvement of the hydrogen sorption kinetics, which confirms the catalytic role of the carbon structure [90]. 

Fig. 8.22 Hydrogen sorption kinetics at room temperature from 14th cycle to 25th cycle showing little degradation in kinetics and no degradation in the storage capacity within the measured cycies...

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