用真空电弧熔炼方法制备了Zr1-xScxMn0.6V0.2Ni1.2Co0.1(x=0～1)AB2型储氢合金,研究了Sc元素替代Zr对合金的微观组织结构、气态储氢及电化学性能的影响.研究结果表明,Zr1-xScxMn0.6V0.2 Ni1.2 Co0.1合金主要是由FCC型C15相、CsC1型结构的(ScZr)Ni相和少量的Ni10Zr7相组成,随Sc含量的增加,C15相丰度逐渐减小,(ScZr) Ni相丰度逐渐增加,当x=0.2时Ni10 Zr7相基本消失;Sc元素对合金的首次气态吸氢动力学行为影响较大,随Sc含量的增加,合金吸氢动力学性能逐渐变缓,但吸氢容量逐渐提高,直至达x=1.0时的最大吸氢量1.87％;Sc元素对合金吸氢PCT曲线平衡氢压的影响规律不明显,随Sc含量增加,合金氢化物的形成焓△H从-26.66 kJ·mol-1逐渐减小到-8.14 kJ·mol-1.Sc元素的加入可明显改善合金电极的活化性能,提高放电容量,随Sc含量的增加,合金电极最大放电容量从x=0时的350.3 mAh·g-增加到x=1时的429.8 mAh·g-1,呈先减小后增大的趋势,但电极容量的保持率S100随Sc含量增加而快速下降.
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