Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 15, Issue 11, Pages 10922-10935Publisher
ESG
DOI: 10.20964/2020.11.02
Keywords
Mg-8Li-0.5La; Mg-8Li-1La; Alloy anode; Discharge behaviors; Electrochemical performance; Sodium chloride solution
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Funding
- National College Students' Innovation and Entrepreneurship Training Program Project [201810217163]
- Natural Science Foundation of Zhejiang Province [LY19E010005, 6141B042869]
- Key Laboratory Fund Project [6142901180201]
- Natural Science Foundation of Hei-longjiang Province of China [LH2020E065]
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The electrochemical performance of Mg-8Li-0.5La and Mg-8Li-1La alloy as anodes for seawater battery were investigated by electrochemical techniques. Scanning electron microscopy (SEM) was used to characterize the microstructures and the corroded surfaces of the above anodes. X-ray diffraction (XRD) was used to analyze the composition and the crystalline pattern of the discharging products. Results show that Mg-8Li-1La anode has the higher electrochemical activity and the better corrosion resistance. Potentiodynamic polarization shows that the corrosion potentials of Mg-8Li-1La alloy anode and Mg-8Li-0.5La alloy anode are -1.64 V and -1.67 V (vs. SCE), respectively, which are more active than the Mg-8Li alloy anode(-1.57 V vs. SCE). The current densities for anodes at the discharge voltage of -1.0 V increase with the following order: Mg-8Li (31 mA.cm(-2)) < Mg-8Li-0.5La (35 mA.cm(-2)) < Mg-8Li-1La (42 mA.cm(-2)). The Mg-8Li-1La alloy anode provides a more negative voltage than Mg-8Li-0.5La alloy anode and Mg-8Li alloy anode during the galvanostatic discharge test. Therefore, the content of La in alloys obviously affects the electrochemical performance of alloys.
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