Research on the discharge performance of Mg-1Ge-1In magnesium-air battery anode
This study proposes a strategy to regulate the microstructure of Mg-1Ge-1In alloy by using the differ-ence in solid solubility of germanium and indium in magnesium.After homogenization annealing,the Mg2Ge phase in the alloy exhibits a continuous network-like structure.The Mg-1Ge-1In alloy demonstrates exceptional anode discharge performance,encompassing a low corrosion rate of 2.48 mm/y,a discharge voltage of-1.70 V at a discharge current of 1 mA/cm2,and a remarkable anode utilization efficiency of up to 59.49％after dischar-ging at 10 mA/cm2 for 1 h.In addition,under a discharge condition of 5 mA/cm2,the Mg-1Ge-1In alloy main-tains a stable voltage,accompanied by a layered peeling phenomenon on its surface.However,as the discharge current increases to 10 mA/cm2,the discharge voltage undergoes some decay,accompanied by a decrease in dis-charge stability.The discharge activation mechanism of the Mg-1Ge-1In alloy is based on the galvanic effect of the Mg2Ge phase and the oxidation-reduction cycle of In atoms.The discharge active sites originate from the continuous network interface between the Mg2Ge phase and the magnesium matrix.The addition of In further enhances the activation of the magnesium matrix surface.The synergistic effect of these two factors ensures the stable and continuous progress of the discharge reaction.
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