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快淬纳米晶/非晶Mg2-xLaxNi (x=0~0.6)合金的电化学贮氢性能
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国家自然科学基金项目 (50871050,50961001);内蒙古自然科学基金重点项目 (200711020703); 内蒙古高等教育科学研究项目 (NJzy08071)


Electrochemical Hydrogen Storage Characteristics of Spun Nanocrystalline/Amorphous Mg2-xLaxNi (x=0-0.6) Alloys
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    摘要:

    用铸造及快淬工艺制备Mg2Ni型Mg2-xLaxNi (x= 0, 0.2, 0.4, 0.6)贮氢合金。用XRD、SEM、HRTEM分析铸态及快淬态合金的微观结构。结果发现,在快淬无La合金中没有出现非晶相,但快淬含La合金显示了以非晶相为主的结构。用DSC研究快淬合金的热稳定性,表明La的含量及快淬对非晶相的晶化温度影响很小。电化学测试结果表明,铸态合金的放电容量随La含量的增加而增加,快淬态合金的放电容量随La含量的变化有极大值。La替代Mg显著地提高了铸态及快淬态合金的循环稳定性。

    Abstract:

    Mg2Ni-type Mg2-xLaxNi (x=0, 0.2, 0.4, 0.6) hydrogen storage alloys were prepared by casting and rapid quenching, respectively. The microstructures of the as-cast and quenched alloys were studied by XRD, SEM and HRTEM. Results show that no amorphous phase forms in the as-quenched La-free alloy, but the as-quenched alloys containing La hold a major amorphous phase. Thermal stability of the as-quenched alloys was studied by DSC, and the results show that La content and the quenching rate induce a negligible influence on the crystallization temperature of the amorphous phase. The electrochemical measurement shows that the discharge capacity of the as-cast alloys grows with the increase of La content, while the as-quenched alloys obtain the maximum discharge capacities with the variation of La content. The substitution of La for Mg markedly enhances the cycle stability of the as-cast and quenched alloys

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张羊换,马志鸿,赵栋梁,任慧平,郭世海,王新林.快淬纳米晶/非晶Mg2-xLaxNi (x=0~0.6)合金的电化学贮氢性能[J].稀有金属材料与工程,2011,40(9):1648~1652.[Zhang Yanghuan, Ma Zhihong, Zhao Dongliang, Ren Huiping, Guo Shihai, Wang Xinlin. Electrochemical Hydrogen Storage Characteristics of Spun Nanocrystalline/Amorphous Mg2-xLaxNi (x=0-0.6) Alloys[J]. Rare Metal Materials and Engineering,2011,40(9):1648~1652.]
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  • 收稿日期:2010-09-10
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