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电化学(中英文) ›› 2019, Vol. 25 ›› Issue (5): 631-638.  doi: 10.13208/j.electrochem.180529

• 研究论文 • 上一篇    下一篇

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1,2*,罗丽容2,李永治2,翟亭亭2,赵 鑫2,张羊换1, 2   

  1. 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 出版日期:2019-10-28 发布日期:2018-08-27
  • 通讯作者: 胡 锋 E-mail:hufengnhm_001@163.com
  • 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 Feng1,2*, LUO Li-rong2, LI Yong-zhi2, ZHAI Ting-ting2, ZHAO Xin2, ZHANG Yang-huan1,2   

  1. 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:2018-06-27 Revised:2018-07-17 Published:2019-10-28 Online:2018-08-27
  • Contact: HU Feng E-mail:hufengnhm_001@163.com

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.

关键词: 快速凝固, 非晶纳米晶, 放电容量, 电化学动力学, 活化能

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.

Key words: rapid solidification, nano-crystalline and/or amorphous, discharging capacity, electrochemistry kinetics, activation energy

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