TY - JOUR
T1 - Crystal defect analysis and surface characteristics of Mg2 NiH4 produced by hydriding combustion synthesis
AU - Liu, Dongming
AU - Zhu, Yunfeng
AU - Li, Liquan
PY - 2007/9
Y1 - 2007/9
N2 - The mechanism of the high activity of Mg2 NiH4 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 Mg2 NiH4 and an outmost layer of Mg (OH)2, instead of MgO determined on the surface of the as-synthesized Mg2 NiH4, as well as a large amount of fresh surfaces in Mg2 Ni particles that was generated in the dehydriding process of the as-synthesized Mg2 NiH4 prior to the first hydrogenation were revealed and considered as the intrinsic reasons contributing to the high activity of Mg2 NiH4 produced by the process of HCS. These results are helpful to control and improve the hydrogen storage properties of the HCS product further.
AB - The mechanism of the high activity of Mg2 NiH4 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 Mg2 NiH4 and an outmost layer of Mg (OH)2, instead of MgO determined on the surface of the as-synthesized Mg2 NiH4, as well as a large amount of fresh surfaces in Mg2 Ni particles that was generated in the dehydriding process of the as-synthesized Mg2 NiH4 prior to the first hydrogenation were revealed and considered as the intrinsic reasons contributing to the high activity of Mg2 NiH4 produced by the process of HCS. These results are helpful to control and improve the hydrogen storage properties of the HCS product further.
KW - Crystal defect
KW - High activity
KW - Hydriding combustion synthesis
KW - Magnesium-based hydrogen storage alloy
KW - Surface characteristic
UR - http://www.scopus.com/inward/record.url?scp=34548120186&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2006.11.021
DO - 10.1016/j.ijhydene.2006.11.021
M3 - 文章
AN - SCOPUS:34548120186
SN - 0360-3199
VL - 32
SP - 2417
EP - 2421
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 13
ER -
