Crystal defect analysis and surface characteristics of Mg 2 NiH 4 produced by hydriding combustion synthesis
The mechanism of the high activity of Mg 2 NiH 4 produced by the process of hydriding combustion synthesis (HCS) was discussed for the first time based mainly on the crystal defects and surface characteristics examined by means of high-resolution transmission electron microscopy (HRTEM), X-ray photo...
Saved in:
Published in | International journal of hydrogen energy Vol. 32; no. 13; pp. 2417 - 2421 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2007
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The mechanism of the high activity of
Mg
2
NiH
4
produced by the process of hydriding combustion synthesis (HCS) was discussed for the first time based mainly on the crystal defects and surface characteristics examined by means of high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). A large number of crystal defects (lattice distortions, dislocations, stacking faults and microtwins) observed in the as-dehydrogenated product of
Mg
2
NiH
4
and an outmost layer of
Mg
(
OH
)
2
, instead of MgO determined on the surface of the as-synthesized
Mg
2
NiH
4
, as well as a large amount of fresh surfaces in
Mg
2
Ni
particles that was generated in the dehydriding process of the as-synthesized
Mg
2
NiH
4
prior to the first hydrogenation were revealed and considered as the intrinsic reasons contributing to the high activity of
Mg
2
NiH
4
produced by the process of HCS. These results are helpful to control and improve the hydrogen storage properties of the HCS product further. |
---|---|
ISSN: | 0360-3199 1879-3487 |
DOI: | 10.1016/j.ijhydene.2006.11.021 |