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首页> 外文期刊>International journal of hydrogen energy >Electrochemical performances of the as-melt La_(0.75-x)M_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (M = Pr, Zr; x = 0, 0.2) alloys applied to Ni/metal hydride (MH) battery
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Electrochemical performances of the as-melt La_(0.75-x)M_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (M = Pr, Zr; x = 0, 0.2) alloys applied to Ni/metal hydride (MH) battery

机译：应用于Ni /金属氢化物的La_（0.75-x）M_xMg_（0.25）Ni_（3.2）Co_（0.2）Al_（0.1）（M = Pr，Zr; x = 0，0.2）合金的熔融态电化学性能MH）电池

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摘要

The partial replacement of La by M (M = Pr, Zr) has been performed in order to ameliorate the electrochemical hydrogen storage performances of La-Mg-Ni-based A_2B_7-type elec trode alloys. For this purpose, we adopt melt spinning technology to prepare the La_(0.75-x)M_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (M = Pr, Zr; x = 0, 0.2) electrode alloys. Then systemically investigate the effects that the preparation methods and M (M = Pr, Zr) substitution have on the structures and electrochemical hydrogen storage characteristics of the alloys. The analysis of XRD and TEM reveals that the as-cast and spun alloys hold a multiphase structure, containing two main phases (La, Mg)_2Ni_7 and LaNi_5 as well as a trace of residual phase LaNi_2. Besides, the as-spun (M = Pr) alloy displays an entire crystalline structure, while an amorphous-like structure is detected in the as-spun (M = Zr) alloy, implying the replace ment of La by Zr facilitates forming amorphous phase. Based upon electrochemical measurements, an impact engendered by melt spinning on the electrochemical perfor mances of the alloys appears to be evident. The cycle stabilities monotonously augment with the growing of the spinning rate. The discharge capacity and high rate discharge ability (HRD), however, exhibit difference. For the (M = Pr) alloy, they first mount up and then fall with the rising of the spinning rate, whereas for the (M = Zr) alloy, they always decline as the spinning rate elevates. Furthermore, the replacement of La by M (M = Pr, Zr) considerably enhances the cycle stability of the alloys and the replacement of La by Pr clearly increases the discharge capacity, but the Zr replacement results in an adverse impact.
机译：为了改善La-Mg-Ni基A_2B_7型电极合金的电化学储氢性能，已经进行了用M（M ＝ Pr，Zr）置换La的部分。为此，我们采用熔融纺丝技术制备La_（0.75-x）M_xMg_（0.25）Ni_（3.2）Co_（0.2）Al_（0.1）（M = Pr，Zr; x = 0，0.2）电极合金。然后系统地研究了制备方法和M（M = Pr，Zr）取代对合金的结构和电化学储氢特性的影响。 XRD和TEM分析表明，铸态合金和旋压合金具有多相结构，包含两个主要相（La，Mg）_2Ni_7和LaNi_5，以及痕量的残余相LaNi_2。此外，初生（M = Pr）合金显示出完整的晶体结构，而初生（M = Zr）合金中检测到非晶态结构，这意味着用Zr替代La有助于形成非晶相。 。基于电化学测量，熔体纺丝对合金的电化学性能的影响似乎是明显的。随着纺丝速度的增加，循环稳定性单调增加。但是，放电容量和高倍率放电容量（HRD）存在差异。对于（M = Pr）合金，它们会先增加，然后随着纺丝速率的增加而下降，而对于（M = Zr）合金，它们总是随着纺丝速率的提高而降低。此外，用M代替La（M = Pr，Zr）大大提高了合金的循环稳定性，而用Pr代替La明显增加了放电容量，但是Zr替代导致不利的影响。

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  • 来源
    《International journal of hydrogen energy》 |2012年第19期|p.14590-14597|共8页
  • 作者

    Yang-huan Zhang; Ying Cai; Chen Zhao; Ting-ting Zhai; Guo-fang Zhang; Dong-liang Zhao;

  • 作者单位

    Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology,Baotou 014010, China,Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;

    Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology,Baotou 014010, China;

    Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology,Baotou 014010, China,Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;

    Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;

    Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology,Baotou 014010, China,Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;

    Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A_2B_7-type electrode alloys; element replacement; melt spinning; electrochemical hydrogen storage; performance;

    机译：A_2B_7型电极合金;元素替换;熔融纺丝电化学储氢性能;

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