Characterization of Mg–20 wt% Ni–Y hydrogen storage composite prepared by reactive mechanical alloying

Mg–20 wt% Ni–Y composite was successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement showed that both MgH 2 and Mg 2NiH 4 co-exist in the milled composite. The composite exhibits excellent hydrogen sorption kinetics and does not need activation on the first h...

Full description

Saved in:
Bibliographic Details
Published in:International journal of hydrogen energy 2007-08, Vol.32 (12), p.1869-1874
Main Authors: Li, Zhinian, Liu, Xiaopeng, Jiang, Lijun, Wang, Shumao
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Energy
Exact sciences and technology
Fuels
High-energy ball milling
Hydrogen
Hydrogen storage material
Magnesium
PCT
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Mg–20 wt% Ni–Y composite was successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement showed that both MgH 2 and Mg 2NiH 4 co-exist in the milled composite. The composite exhibits excellent hydrogen sorption kinetics and does not need activation on the first hydrogen storage process. It can absorb 3.92 and 5.59 wt% hydrogen under 3.0 MPa hydrogen pressure at 293 and 473 K in 10 min, respectively, and desorb 4.67wt% hydrogen at 523 K in 30 min under 0.02 MPa hydrogen pressure. The equilibrium desorption pressure of the composite are 0.142, 0.051 and 0.025 MPa at 573, 543 and 523 K, respectively. The differential scanning calorimetry (DSC) measurement showed that dehydrogenation of Mg–20 wt% Ni–Y composite was depressed about 100 K comparing to that of milled pure MgH 2. It is deduced that both the catalysis effect of Mg 2Ni and YH 3 distributed in Mg substrate and the crystal defects formed by RMA are the main reason for improving hydrogen sorption kinetics of the Mg–20 wt% Ni–Y composite.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2006.09.022