Citation: LUO Yong-Chun, ZHANG Tie-Jun, WANG Duo, KANG Long. Influence of Ball-Milling on Hydrogen Storage and Electrochemical Properties of (Ti Cr)_0.497V_0.42Fe_0.083/30%(w) (LaRMg)(NiCoAl)_3.5 Alloy Electrodes[J]. Acta Physico-Chimica Sinica, ;2010, 26(09): 2397-2404. doi: 10.3866/PKU.WHXB20100845 shu

Influence of Ball-Milling on Hydrogen Storage and Electrochemical Properties of (Ti Cr)_0.497V_0.42Fe_0.083/30%(w) (LaRMg)(NiCoAl)_3.5 Alloy Electrodes

1.
1. College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China;
2. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, P. R. China

Received Date: 18 February 2010
Available Online: 7 July 2010
Fund Project:

Changes in phase structure, hydrogen storage and electrochemical properties of the (Ti Cr)_0.497V_0.42Fe_0.083+ 30% (w) (LaRMg)(NiCoAl)_3.5 alloy after treatment by ball-milling for different time (t=0, 0.5, 1, 3, 5, 10 h) were investigated systematically. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) showed that the particle size of the milled composite samples decreased gradually and the powder appears aggregated. The A₂B₇ alloy particles were uniformly dispersed and encapsulated on the surface of the V based alloy particles that were formed after increasing the ball-milling time. It was found that nanocrystalline composites were formed and partial amorphization occurred when the milling time was more than 5 h. The crystal parameter a and the cell volume V of the BCC phase structure in the composite both showed a decrease. Hydrogen storage capacity of the single V based alloy was 3.11%(w), with an increase in milling time hydrogen storage capacity of the milled composites decreased and the maximum hydrogen absorption capacity at room temperature approached 2.47%(w). Electrochemical studies showed that the electrochemical properties of the milled composite were enhanced and the maximum discharge capacity was 425.8 mAh·g^-1. The cyclic stability of the composite electrode improved noticeably. After 100 charge-discharge cycles the discharge capacity retention rate C₁₀₀/C_max of the milled composite electrode was 97%, and it had a better cycle life than that of the A₂B₇ type alloy electrode.
- V-Ti-Cr-Fe and rare earth based alloy,
- Modification by ball-milling,
- Hydrogen storage property,
- Electrochemical property
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of Ball-Milling on Hydrogen Storage and Electrochemical Properties of (Ti Cr)0.497V0.42Fe0.083/30%(w) (LaRMg)(NiCoAl)3.5 Alloy Electrodes

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通讯作者: 陈斌, bchen63@163.com

Influence of Ball-Milling on Hydrogen Storage and Electrochemical Properties of (Ti Cr)_0.497V_0.42Fe_0.083/30%(w) (LaRMg)(NiCoAl)_3.5 Alloy Electrodes