铸态及快淬态CeMg11Ni合金电化学及其动力学性能

doi:10.12028/j.issn.2095-4239.2019.0039

储能科学与技术 ›› 2019, Vol. 8 ›› Issue (5): 904-910.doi: 10.12028/j.issn.2095-4239.2019.0039

铸态及快淬态CeMg₁₁Ni合金电化学及其动力学性能

罗丽容, 蔡颖, 胡锋

内蒙古科技大学材料与冶金学院, 内蒙古包头 014010

收稿日期:2019-03-21 修回日期:2019-04-18 出版日期:2019-09-01 发布日期:2019-04-22
通讯作者: 蔡颖,教授,主要从事稀土功能材料研究,E-mail:aabb1965@126.com。
作者简介:罗丽容(1993-),女,硕士研究生,主要从事稀土储氢材料研究,E-mail:846702329@qq.com
基金资助:
国家自然科学基金（51871125，51371094）。

Electrochemical and kinetic properties of as-cast and quenched CeMg₁₁Ni hydrogen storage alloys

LUO Lirong, CAI Ying, HU Feng

The School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

Received:2019-03-21 Revised:2019-04-18 Online:2019-09-01 Published:2019-04-22

摘要/Abstract

摘要： 采用感应熔炼法制备CeMg₁₁Ni铸态合金，对部分铸态合金二次重熔并经过快速凝固处理获得快淬态合金，对快淬态合金进行X射线衍射表征（XRD），运用高分辨透射电镜（HRTEM）技术分析合金的微观形貌特征及晶态结构，并通过充放电容量及其循环稳定性分析、交流阻抗谱测试和动电位极化曲线对合金CeMg₁₁Ni的性能进行详细研究。研究结果表明：铸态合金由多相结构组成，快淬工艺可促使合金内部形成大量非晶纳米晶结构、改善合金活化性能与电化学循环稳定性、减少合金氢化物释放焓值、降低合金表面活化能、增强电荷传递反应同时增强合金内部氢原子扩散能力，进一步解释了合金拥有较强电化学反应动力学性能原因。

关键词: 快淬合金, 技术表征, 放电容量, 循环稳定性, 动力学性能

Abstract: Used induction melting method to prepare CeMg₁₁Ni as-cast alloy, and the partially alloys through re-melting and rapid solidification to obtain the quenched alloy. The microstructures properties of as-cast and microscopic structures were characterized by X-ray diffraction (XRD) and transmission electron microscopy(HRTEM). The performance of the CeMg₁₁Ni alloy were studied in detail by charge and discharge capacity, cycle stability, electrochemical impedance spectroscopy (EIS) technique and potentiodynamic polarization. The results showed that the as-cast alloy was consists of multi-phase structures, the as-quenched method can promote the formation of a large number of amorphous and nano-crystalline structures, improve the activation properties and electrochemical cycle stability, reduce the alloy's de-hydrogen enthalpy, reduce the alloy's surface activation energy, enhance charge transfer reaction and hydrogen atom diffusion ability, besides, further explain the reason why the alloy has strong electrochemical reaction kinetics.

Key words: as-cast alloy, technical characterization, discharge capacity, cycle stability, kinetic property

中图分类号:

TG139

罗丽容, 蔡颖, 胡锋. 铸态及快淬态CeMg₁₁Ni合金电化学及其动力学性能[J]. 储能科学与技术, 2019, 8(5): 904-910.

LUO Lirong, CAI Ying, HU Feng. Electrochemical and kinetic properties of as-cast and quenched CeMg₁₁Ni hydrogen storage alloys[J]. Energy Storage Science and Technology, 2019, 8(5): 904-910.

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铸态及快淬态CeMg₁₁Ni合金电化学及其动力学性能

Electrochemical and kinetic properties of as-cast and quenched CeMg₁₁Ni hydrogen storage alloys

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