| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1282024 | International Journal of Hydrogen Energy | 2006 | 6 Pages |
The phase relations and electrochemical properties of the Ca1-xMgx(Ni0.9Al0.1)2Ca1-xMgx(Ni0.9Al0.1)2 alloys have been studied. It was found that the single C15 phase and the single C36 phase exist, respectively, in the approximate composition ranges of x=0x=0–0.63 and 0.76–1. Between the single-phase regions, the C15 and C36 phases coexist. The hydrogen storage capacity of the C15-type Ca1-xMgx(Ni0.9Al0.1)2Ca1-xMgx(Ni0.9Al0.1)2 alloys was lifted with increasing Mg content x . When x=0.6x=0.6, the hydrogen absorption and desorption capacities are 1.33 and 0.8 wt%, respectively. The alloy electrodes do not need activation during electrochemical measurements. The discharge capacity of the Ca0.4Mg0.6(Ni0.9Al0.1)2Ca0.4Mg0.6(Ni0.9Al0.1)2 alloy is 401 mAh/g at a discharge current of 10 mA/g. However, the cyclic stability should be improved significantly.
