用放电等离子烧结技术(SPS)制备La0.7 Mg0.3Ni2.5Cox(x=0.1,0.2,0.3,0.4,0.5)贮氢合金.采用X射线衍射、三电极测试体系和交流阻抗法研究了合金的相结构、贮氢性能和电化学性能.结果表明:合金为多相结构,主相为(La,Mg)2Ni7和(La,Mg)Ni3相;该系列贮氢合金的贮氢容量随x值的增大先增后减,在x=0.4时贮氢容量达1.37%,最大放电容量为365.4 mAh/g.合金的活化性能好(活化次数均为1次),随着x值的增加,贮氢合金的放氢平台压力升高,合金电极表面电荷转移速率增大.
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