TY - JOUR
T1 - Effect of multi-wall carbon nanotubes supported nano-nickel and TiF3 addition on hydrogen storage properties of magnesium hydride
AU - Su, Wei
AU - Zhu, Yunfeng
AU - Zhang, Jiguang
AU - Liu, Yana
AU - Yang, Yang
AU - Mao, Qifeng
AU - Li, Liquan
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/6/5
Y1 - 2016/6/5
N2 - Multi-wall carbon nanotubes supported nano-nickel (Ni/MWCNTs) with superior catalytic effects was introduced to magnesium hydride by the process of hydriding combustion synthesis (HCS) and mechanical milling (MM). The effect of different Ni/MWCNTs contents (5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) on the hydrogenation and dehydrogenation properties of the composite was investigated systematically. It is revealed that Mg85-(Ni/MWCNTs)15 composite shows the best comprehensive hydrogen storage properties, which absorbs 5.68 wt.% hydrogen within 100 s at 373 K and releases 4.31 wt.% hydrogen within 1800 s at 523 K under initial hydrogen pressures of 3.0 and 0.005 MPa, respectively. The in situ formed nano-Mg2Ni and MWCNTs have excellent catalytic effect on the hydrogenation and dehydrogenation performances of MgH2. To further improve the hydrogen absorption/desorption properties, TiF3 was added to the Mg–Ni/MWCNTs system. The result shows that TiF3 addition has little influence on the thermodynamic performance, but affects greatly the kinetic properties. The Mg85-(Ni/MWCNTs)15-TiF3 composite exhibits an appreciably enhanced hydrogen desorption performance at low temperature, and the hydrogen desorption capacity within 1800 s at 473 K for the TiF3-added composite is approximately four times the capacity of Mg85-(Ni/MWCNTs)15 under the same condition. The catalytic effects during hydrogenation and dehydrogenation have been discussed in the study.
AB - Multi-wall carbon nanotubes supported nano-nickel (Ni/MWCNTs) with superior catalytic effects was introduced to magnesium hydride by the process of hydriding combustion synthesis (HCS) and mechanical milling (MM). The effect of different Ni/MWCNTs contents (5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) on the hydrogenation and dehydrogenation properties of the composite was investigated systematically. It is revealed that Mg85-(Ni/MWCNTs)15 composite shows the best comprehensive hydrogen storage properties, which absorbs 5.68 wt.% hydrogen within 100 s at 373 K and releases 4.31 wt.% hydrogen within 1800 s at 523 K under initial hydrogen pressures of 3.0 and 0.005 MPa, respectively. The in situ formed nano-Mg2Ni and MWCNTs have excellent catalytic effect on the hydrogenation and dehydrogenation performances of MgH2. To further improve the hydrogen absorption/desorption properties, TiF3 was added to the Mg–Ni/MWCNTs system. The result shows that TiF3 addition has little influence on the thermodynamic performance, but affects greatly the kinetic properties. The Mg85-(Ni/MWCNTs)15-TiF3 composite exhibits an appreciably enhanced hydrogen desorption performance at low temperature, and the hydrogen desorption capacity within 1800 s at 473 K for the TiF3-added composite is approximately four times the capacity of Mg85-(Ni/MWCNTs)15 under the same condition. The catalytic effects during hydrogenation and dehydrogenation have been discussed in the study.
KW - Hydriding combustion synthesis
KW - Hydrogenation and dehydrogenation
KW - Mechanical milling
KW - Ni/MWCNTs
KW - TiF
UR - http://www.scopus.com/inward/record.url?scp=85011801236&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2016.01.253
DO - 10.1016/j.jallcom.2016.01.253
M3 - 文章
AN - SCOPUS:85011801236
SN - 0925-8388
VL - 669
SP - 8
EP - 18
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -