Preparation and Electrochemical Characteristics ofa New Type Mg-based Hydrogen Storage Alloys

Abstract

Abstract: The Mg-based hydrogen storage alloys Mg_1.5Al_0.5-xNiV_x(x= 0, 0.1, 0.2, 0.3,0.4) were successfully synthesized by means of a diffusion method (MD).The structure of these alloys were examined by X-ray diffraction.Anew phase was found in the alloys.Its chemical formula is Mg₃AlNi₂.Further studies reveal that the new phase has excellent electrochemical properties.The discharge capacity of Mg_1.5Al_0.5-xNiV_x alloys increases owing to Vaddition and reaches the highest capacity of 333 mA·h·g^-1 (50 mA·g^-1, -0.5 Vvs.Hg/HgO) without any treatment.The improvement of cycle life was ascribed to the partial substitution of Al for Mg in the alloy.

Key words: Mg-based hydrogen storage alloys, Electrode, Electrochemical properties

CLC Number:

O631

TrendMD:

YUAN Hua-Tang, LI Qiu-Di, WANG Yi-Jing, SONG He-Nan, FENG Yan. Preparation and Electrochemical Characteristics ofa New Type Mg-based Hydrogen Storage Alloys[J]. Chem. J. Chinese Universities, 2002, 23(4): 517.

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Preparation and Electrochemical Characteristics ofa New Type Mg-based Hydrogen Storage Alloys

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