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

Authors

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

Corresponding Author

Feng HU(hufengnhm_001@163.com)

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.

Graphical Abstract

Keywords

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

DOI Link

https://doi.org/10.13208/j.electrochem.180529

Publication Date

2019-10-28

Online Available Date

2018-08-27

Revised Date

2018-07-17

Received Date

2018-06-27

Recommended Citation

Feng HU, Li-rong LUO, Yong-zhi LI, Ting-ting ZHAI, Xin ZHAO, Yang-huan ZHANG. 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.
DOI: 10.13208/j.electrochem.180529
Available at: https://jelectrochem.xmu.edu.cn/journal/vol25/iss5/10