中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 17 Special 1 November 2007 |
(General Research Institute for Nonferrous Metals, Beijing 100088, China)
Abstract:The intermetallic compound Zr1−xHfxCo and Zr1−xScxCo (x=0, 0.1, 0.2, 0.3) were prepared and their suitability for hydrogen storage was investigated. The alloys show single cubic phase identical with ZrCo by X-ray diffraction. Pressure- composition-temperature(PCT) measurement results show that the equilibrium dehydrogenation pressure of Zr1−xHfxCo alloy increases obviously with increasing Hf content while it, changes little with increasing Sc content for Zr1−xScxCo alloy. The dehydrogenation temperatures for supplying 100 kPa hydrogen are about 673, 627, and 650 K for ZrCo, Zr0.7Hf0.3Co and Zr0.7Sc0.3Co alloy, respectively. Thermodynamics calculation results indicate that dehydrogenation ΔH for Zr1−xHfxCo alloy decreases with increasing Hf content but increases with increasing Sc content for Zr1−xScxCo alloy, which are coincident with their dehydrogenation property. The maximal hydrogen storage capacity of both Zr1−xHfxCo and Zr1−xScxCo alloy at room temperature are high enough.
Key words: hydrogen storage alloy; ZrCo; Zr1−xHfxCo; Zr1−xScxCo; intermetallic compound