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研究论文

铸态及快淬态CeMg10Ni2合金电化学储氢热力学及动力学性能研究

  • 胡 锋 ,
  • 罗丽容 ,
  • 李永治 ,
  • 翟亭亭 ,
  • 赵 鑫 ,
  • 张羊换
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  • 1. 钢铁研究总院功能材料研究所,北京市海淀区,100081; 2. 内蒙古科技大学材料与冶金学院,内蒙古自治区包头市,014010

收稿日期: 2018-06-27

  修回日期: 2018-07-17

  网络出版日期: 2018-08-27

基金资助

国家自然科学基金(No. 51761032和51871125)、内蒙古自然科学基金(No.2017BS0507和No. 2018LH05010)、内蒙古科技成果转化项目(No.CGZH2018152)及内蒙古科技大学创新基金项目(No.2014QDL015)

Investigations in Electrochemical Thermodynamic and Kinetic Properties of As-Cast and As-Quenched CeMg10Ni2 Hydrogen Storage Alloys

  • HU Feng ,
  • LUO Li-rong ,
  • LI Yong-zhi ,
  • ZHAI Ting-ting ,
  • ZHAO Xin ,
  • ZHANG Yang-huan
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  • 1. Department of Functional Material Research, Central Iron and Steel Research Institute,Beijing 100081, China; 2. The School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

Received date: 2018-06-27

  Revised date: 2018-07-17

  Online published: 2018-08-27

摘要

为了改善CeMg10Ni2合金的电化学储氢性能,快淬技术被用来制备具有非晶纳米晶结构的CeMg10Ni2合金. 运用X射线衍射及高分辨透射电镜对合金的微观结构及其相组成进行分析. 通过恒电流充放电、高倍率放电、交流阻抗以及动电位极化测试对合金的电化学性能进行了详细研究. 研究结果表明,铸态合金由多相结构组成,经过快速凝固处理的合金内部含有大量的非晶纳米晶结构,而且增加的凝固速度可以增强合金内部的非晶纳米晶形成能力. 快速凝固处理减小了合金的热力学参数(ΔH和ΔS),降低了合金氢化物的热稳定性,改善了电化学放电容量. 另外,快速凝固处理显著改善了合金的电化学动力学性能,合金的表观活化能变化进一步解释了这一结论.

本文引用格式

胡 锋 , 罗丽容 , 李永治 , 翟亭亭 , 赵 鑫 , 张羊换 . 铸态及快淬态CeMg10Ni2合金电化学储氢热力学及动力学性能研究[J]. 电化学, 2019 , 25(5) : 631 -638 . DOI: 10.13208/j.electrochem.180529

Abstract

In order to improve the electrochemical hydrogen storage properties of CeMg10Ni2 alloy, the rapid quenching technology was used to prepare CeMg10Ni2 alloys with nano-crystalline and amorphous structure. The microstructures of as-cast and as-spinning sample were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The electrochemical hydrogen storage properties were investigated by an automatic galvanostatic charging/discharging, high rate discharging (HRD), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The results revealed that the as-cast alloy was composed of multiphase structures. The as-quenched alloys were made up of nano-crystalline and/or amorphous structures, and the rapid solidification technology enhanced the glass forming ability of alloys. The rapid spinning technology brought on a reduction in thermodynamic parameters (ΔH and ΔS), which lowered the stability of hydride and ameliorated the discharging capacity of alloy sample. Besides, the as-quenched alloys held better electrochemical kinetics, which may be interpreted by the variation of activation energy.
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