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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.

参考文献

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