Abstract
Herein, we propose a novel Mg-based micro-alloyed Mg-1Al-0.3Mn-0.3La (wt%) anode to obtain enhanced discharge characteristics in an Mg-air battery. In this study, comparisons are made with the Mg-1Al-0.3Mn alloy and commercial Mg-6Al-0.3Mn. Adding La in the Mg-1Al-0.3Mn-0.3La alloy inhibits the hydrogen evolution both at open circuit potential and under the condition of anode polarization but promotes a rapid anode dissolution. Furthermore, adding La can tune the microstructure of Mg-1%Al-0.3%Mn towards uniform dissolution and limit the chunk effect when used as an anode in the Mg-air battery system. Moreover, the intermetallic Al2La phase is shown to be critical in the formation and peeling off the loose-knit oxidation products. Thus, we report that the voltage and energy density of the Mg-air cell improved by adopting the Mg-1%Al-0.3%Mn-0.3%La anode, making it an excellent anode candidate for future practical applications.
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