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纳米Mg_2Ni-1.00%Pd的吸放氢特性研究 被引量：1

Hydriding/Dehydriding Characteristics of Nanocrystalline Mg_2Ni-1.00%Pd
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摘要 采用机械合金化法制备了Mg2Ni-1.00%Pd(质量分数)合金粉末,用XRD及AFM等分析表征了材料吸放氢前后相和微观结构的变化,测定了Mg2Ni-1.00%Pd合金的吸放氢动力学曲线和PCT曲线。结果表明,机械合金化制备的Mg2Ni-1.00%Pd合金粉末颗粒尺寸在10-50 nm之间;添加1.00%Pd机械球磨,可显著地改善纳米Mg2Ni合金的吸/放氢动力学性能,在初始氢压为1.17 MPa、温度为423和473 K时,同熔炼法制备的合金相比,材料无需活化即可快速吸氢;PCT曲线上有明显的坪台区,而且坪宽较长,有一定的滞后效应且滞后系数随温度的升高而降低;同熔炼法制备的Mg2Ni合金相比,纳米Mg2Ni-1.00%Pd合金吸氢时的焓变值减小,放氢时焓变值增加,可逆贮氢容量为3.0%H2。 The Mg2Ni- 1.00 % Pd （mass fraction） alloy was prepared by mechanical alloying. XRD and AFM analyses were used to identify the phase and microstructure of the Mg2Ni-1.00% Pd alloy before and after hydrogen absorption. Kinetics curves and PCT curves of Mg2Ni-1.00% Pd-H2 system were measured. The results showed that the particle size of MgaNi-1.00% Pd alloy prepared by mechanical milling is between 10 ～ 50 nm. Ball milling with 1.00%Pd could significantly improve the hydriding/dehydriding （H/D） performance of nanocrystalline Mg2Ni. Comparing with the Mg2Ni alloy prepared by melting, the sample could easily absorb hydrogen at 423 and 473 K under the initial hydrogen pressure of 1.17 MPa without activation. There was obvious and long-width plateaus on the PCT curves, the hysteresis effect existed during hydrogen absorption/desorption and it decreased with the increase of temperature. Comparing with the Mg2Ni alloy prepared by melting, the enthalpy of nanocrystalline Mg2Ni-1.00% Pd decreased at hydrogen absorption and increased when hydrogen desorption. The nanocrystalline Mg2Ni-1. 00% Pd sample had a reversible storage capacity as high as 3.0%H2.
作者 叶小球 桑革 罗学建
机构地区 中国工程物理研究院
出处 《稀有金属》 EI CAS CSCD 北大核心 2007年第1期32-37,共6页 Chinese Journal of Rare Metals
基金 中国工程物理研究院基金资助项目(20040870)
关键词 贮氢合金 MG2NI 高能球磨 吸放氢性能 hydrogen storage alloy Mg2Ni high-energy-milling hydriding and dehydriding properties
分类号 TG139.7 [一般工业技术—材料科学与工程]
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参考文献9

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二级参考文献2

共引文献21

同被引文献38

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稀有金属
2007年 第1期

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