Preparation and Electrochemical Properties of Mg40Al60 Hydrogen Storage Alloy

Zhong Qiu Cao; Ting Wang; Ke Zhang; Hui Zhang

doi:10.4028/www.scientific.net/AMR.347-353.3232

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 347-353Preparation and Electrochemical Properties of...

Preparation and Electrochemical Properties of Mg₄₀Al₆₀ Hydrogen Storage Alloy

Abstract:

Microstructural characteristics and electrochemical properties of Mg₄₀Al₆₀ hydrogen storage alloy prepared by mechanical alloying (MA) method were studied by XRD, discharge capacities, polarization curves and electrochemical impedance spectroscopies(EIS). The intensities of XRD peaks become weak and XRD peaks have a broadening with the increment of ball milling time due to fine grain size and increased internal stress. The discharge capacities of the alloy increase before the alloyed powders were milled for 10h, but they decrease after the alloyed powders were milled for 10h with the increment of ball milling time. The discharge capacities are highest when the alloyed powders were milled for 10h. There are passive phenomena in polarization curves. The corrosion current densities increase with time at the beginning of ball milling and then decrease. The electrochemical impedance spectroscopies(EIS) are composed of a single capacitive loop and the electrode reaction is controlled by charge transfer at alloy/electrolyte interface.

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Periodical:

Advanced Materials Research (Volumes 347-353)

Pages:

3232-3237

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.347-353.3232

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Online since:

October 2011

Authors:

Zhong Qiu Cao, Ting Wang, Ke Zhang, Hui Zhang

Keywords:

Discharge Capacity, Electrochemical Impedance Spectroscopy (EIS), Electrochemical Property, Mg-Based Hydrogen Storage Alloy

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