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The electrochemical behaviors of the Mg-7.5Li-3.5Al and Mg-7.5Li-3.5Al-1Y electrodes in sodium chloride solution

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Abstract

Mg-7.5Li-3.5Al and Mg-7.5Li-3.5Al-1Y alloys are prepared, and their electrochemical performances are investigated by potentiodynamic polarization, potentiostatic current-time curves, electrochemical impedance spectroscopy, scanning electron microscopy (SEM), varying load performances, and utilization efficiencies. The performances of the Mg-H2O2 semi-fuel cells with the above alloy anodes are also determined. It is found that the Mg-7.5Li-3.5Al-1Y electrode has higher discharge activity and better corrosion resistance than Mg-7.5Li-3.5Al electrode in 0.7 mol L−1 NaCl solution. SEM studies indicate that the alloying element Y prevents the formation of dense oxide film on the alloy surface and facilitates peeling off of the oxidation products. The utilization efficiencies of the alloys increase in the order: Mg-7.5Li-3.5Al < Mg-7.5Li-3.5Al-1Y. The Mg-H2O2 semi-fuel cell with Mg-7.5Li-3.5Al-1Y alloy as the anode presents a maximum power density of 92 mW cm−2 at room temperature, which is higher than that with Mg-7.5Li-3.5Al anode (85 mW cm−2). Y is a “promotion element” in the alloy, and the Mg-7.5Li-3.5Al-1Y alloy electrode exhibits better performances comparing to the Mg-7.5Li-3.5Al alloy electrode.

The Mg-7.5Li-3.5Al-1Y electrode shows better discharge performances than that of the Mg-7.5Li-3.5-Al electrode at the same discharging potential.

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Acknowledgments

We gratefully acknowledge the Natural Science Foundation of Heilongjiang Province of China (B201201), the National Natural Science Foundation of China (21203040, 21301038, 51108111), and the Fundamental Research Funds for the Central Universities (HEUCF201403018).

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Authors and Affiliations

  1. Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, China

    Yan-Zhuo Lv, Yan-Zhang Jin, Min Liu, Yan-Feng Li, Li Wang & Dian-Xue Cao

  2. School of Chemical Engineering and Technology, Harbin Institute of Technology, No. 92 West-Da Zhi Street, Harbin, 150001, Heilongjiang Province, China

    Zhen-Bo Wang

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  1. Yan-Zhuo Lv
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  2. Yan-Zhang Jin
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  4. Min Liu
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  5. Yan-Feng Li
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  6. Li Wang
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  7. Dian-Xue Cao
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Correspondence to Yan-Zhuo Lv.

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Lv, YZ., Jin, YZ., Wang, ZB. et al. The electrochemical behaviors of the Mg-7.5Li-3.5Al and Mg-7.5Li-3.5Al-1Y electrodes in sodium chloride solution. Ionics 21, 429–435 (2015). https://doi.org/10.1007/s11581-014-1187-z

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  • DOI: https://doi.org/10.1007/s11581-014-1187-z

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