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