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

doi:10.12028/j.issn.2095-4239.2019.0039

Abstract

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

CLC Number:

TG139

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

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