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| Title: | STUDY ON THE STRUCTURE AND ELECTROCHEMICAL PROPERTIES OF NOVEL ND-MG-NI-CO HYDROGEN STORAGE ALLOYS
The authors would like to thanks for National Nature Science Foundation of China for financial assistance. |
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| DOI No: | 10.1142/9789812838025_0019 | |
| Source: | MATERIALS ISSUES IN A HYDROGEN ECONOMY (pp 203-210) | |
| Author(s): | CHONGCHAO PAN
Key Laboratory of Advanced Materials of Education Ministry, Department of Materials Science & Engineering, Tsinghua University, Beijing 100084, China RONGHAI YU Corresponding author. Tel.: +86-10-62771593. Key Laboratory of Advanced Materials of Education Ministry, Department of Materials Science & Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Nd0.75Mg0.25 (Ni0.8Co0.2) x (x = 3.8 & 4.5) hydrogen storage alloys have been prepared by using mid-frequency induction melting furnace. The structure analyses and electrochemical properties of the alloys were investigated by means of XRD, TEM and electrochemical workstation. From the results it was observed that (Nd, Mg)2(Ni,Co)7, and NdNi5 consist of superstructure (Ce2Ni7 type) and CaCu5 structure respectively. It is found that the main phase of alloy belongs to Ce2Ni7 type Nd2Ni7 super-structure at x = 3.8, Mg atoms are located only at the Laves unit of Ce2Ni7 type unit cell, while Co atoms are located only at the CaCu5 unit. Furthermore, the (Nd, Mg)2(Ni,Co)7, phase was composed with NdNi2(Laves type) units and NdNi5(CaCu5 type) units and aligned along C axial direction like ABBABB, the period of the distance of the dark line pair is about 2.48nm. Electrochemical analyses showed that all the alloys had a large discharge capacity and can be easily activated. The Nd0.75Mg0.25 (Ni0.8Co0.2)3.8 alloy exhibits better electrochemical properties. | |
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