为了提高Mg-Co系合金的放电容量及循环稳定性,通过机械合金化的方法,制备三元Mg_(45)M_5Co_(50)(M=Pd,Zr)合金。透射电子显微镜(TEM)分析表明,合金为体心立方相(BCC)的纳米晶结构。电化学测试表明,在Mg_(45)M_5Co_(50)(M=Mg,Pd,Zr)合金中,Mg_(45)Zr_5Co_(50)电极的容量最高,达到425 m A·h/g;相比Mg_(50)Co_(50),Mg_(45)Pd_5Co_(50)电极的首次放电容量(379 m A·h/g)与电化学动力学性能均得到提高。结果表明,通过用Zr和Pd元素替代Mg元素,Mg-Co基合金的电化学性能得到改善。
【英文摘要】
In order to improve the discharge capacity and cyclic life of Mg-Co-based alloy, ternary Mg_(45)M_5Co_(50)(M=Pd, Zr) alloys were synthesized via mechanical alloying. TEM analysis demonstrates that these alloys all possess body-centered cubic(BCC) phase in nano-crystalline. Electrochemical experiments show that Mg_(45)Zr_5Co_(50) electrode exhibits the highest capacity(425 m A·h/g) among the Mg_(45)M_5Co_(50)(M=Mg, Pd, Zr) alloys. And Mg_(45)Pd_5Co_(50) electrode lifts not only the initial discharge capacity...
【基金】
Projects(51471087,61370042,21173041,11204031,11472080)supported by the National Natural Science Foundation of China;
Project(13KJA430003)supported by the Jiangsu Higher Education Institutions of China;
Project(BK20141336)supported by the Natural Science Foundation of Jiangsu Province,China
【更新日期】
2016-07-26
【分类号】
TG139.7
【正文快照】
1 Introduction
Mg-based hydrogen storage materials have attracted much attention during last decades due to their high capacity,relatively low cost and light mass[1,2].They are also potential candidates for the anode materials of Ni-MH battery[3,4].Serie
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