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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Dehydrogenation characteristic of Zr1−xMxCo (M=Hf, Sc) alloy
TAN Gong-li(谭功理), LIU Xiao-peng(刘晓鹏), JIANG Li-jun(蒋利军),
WANG Shu-mao(王树茂), LI Zhi-nian(李志念), LI Hua-ling(李华玲)

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

ISSN 1672-7029
CN 43-1423/U

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