An Electrochemical Study of Ammonium Dihydrogen Phosphate on Mg and Mg Alloy Electrodes

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 Na₂SiO₃ on the electrochemical behavior of AZ31B Mg alloy in the Na₂SO₄-NaNO₃ 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 Na₂SiO₃. The most negative activation potential (−1.51 V) and the lowest polarization (−3.20 V) were found when 6 mM of Na₂SiO₃ was added; no discharge hysteresis was observed, and the polarization resistance value (R₁) was 3,806 Ω. After 24 h immersion in the composite electrolyte with Na₂SiO₃, more and wider cracks appeared on the alloy surface, where a thick, dense film was formed, showing excellent discharge performance and corrosion resistance.