北京有色金属研究总院能源材料与技术研究所,北京,100088
网络首发:2007-11-10,
纸质出版:2007
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谭功理, 刘晓鹏, 蒋利军, 等. Zr-Hf-Co合金储氢性能研究[J]. 西安交通大学学报, 2007,41(11):1380-1383.
谭功理, 刘晓鹏, 蒋利军, et al. Dehydrogenation Characteristic of Zr-Hf-Co Alloy[J]. 2007, 41(11): 1380-1383.
研究了Hf部分替代Zr对Zr-Hf-Co合金储放氢性能的影响
结果表明:Zr-Hf-Co合金保持原始Zr-Co合金单一的立方相结构
且Hf含量变化对合金晶胞体积影响不大; 随Hf替代量增加
Zr-Hf-Co合金的放氢平台压升高
100 kPa平衡放氢压力对应的放氢温度显著降低
由Zr-Co合金的673 K降低到Zr
0.7
Hf
0.3
Co合金的618 K; 热力学计算结果得到Zr-Hf-Co合金的放氢反应焓变ΔH随Hf替代量增加而降低
表明Zr-Hf-Co合金氢化物的稳定性降低
有利于合金在较低温度下放氢; 合金的最大吸氢量随Hf替代量增加而略有降低
但吸氢动力学性能变化不明显.
The intermetallic compound Zr
1-x
Hf
x
Co(x=0
0.1
0.2
0.3)was prepared and its suitability for hydrogen storage was investigated. The alloy remains with single cubic phase identical with Zr-Co by X-ray diffraction
and with increasing Hf content the lattice parameter of Zr-Hf-Co alloy varies slightly. Pressure-composition-temperature(PCT)measurement results show that the equilibrium dissociation pressure of Zr-Hf-Co alloy increases obviously with increasing Hf content. The dehydrogenation temperatures for supplying 100 kPa hydrogen are about 673
659
640
and 618 K for Zr-Co
Zr
0.9
Hf
0.1
Co
Zr
0.8
Hf
0.2
Co
and Zr
0.7
Hf
0.3
Co alloys
respectively. The thermodynamics calculation results indicate that in dehydrogenation ΔH for Zr-Hf
-Co alloy decreases with increasing Hf content
while ΔS is nearly constant
which are coincident with its dehydrogenation property. The maximal hydrogen storage capacity of Zr-Hf-Co alloy at room temperature decreases slightly with increasing Hf content
but the kinetic characters vary unremarkably.
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