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

doi:10.13208/j.electrochem.180529

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

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. 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 Feng^1,2*, LUO Li-rong², LI Yong-zhi², ZHAI Ting-ting², ZHAO Xin², ZHANG Yang-huan^1,2

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/Abstract

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

中图分类号:

O646
TG139

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（中英文）, 2019, 25(5): 631-638.

HU Feng, LUO Li-rong, LI Yong-zhi, ZHAI Ting-ting, ZHAO Xin, ZHANG Yang-huan. Investigations in Electrochemical Thermodynamic and Kinetic Properties of As-Cast and As-Quenched CeMg₁₀Ni₂ Hydrogen Storage Alloys[J]. Journal of Electrochemistry, 2019, 25(5): 631-638.

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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

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

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