Electrochemical behavior of Mg electrode in sodium salt electrolyte system

A suitable electrolyte is crucial to enhancing the electrochemical performance of magnesium (Mg) batteries. Here, the influence of Na 2 SiO 3 on the electrochemical behavior of AZ31B Mg alloy in the Na 2 SO 4 -NaNO 3 composite electrolyte was investigated. The results revealed that the activation potential of the AZ31B Mg alloy first represented a negative shift and then a positive shift with the increase in Na 2 SiO 3 . The most negative activation potential (−1.51 V) and the lowest polarization (−3.20 V) were found when 6 mM of Na 2 SiO 3 was added; no discharge hysteresis was observed, and the polarization resistance value ( R 1 ) was 3,806 Ω. After 24 h immersion in the composite electrolyte with Na 2 SiO 3 , more and wider cracks appeared on the alloy surface, where a thick, dense film was formed, showing excellent discharge performance and corrosion resistance.