AUTHOR=Zhang Yu , Zhu Qingguang , Su Chang , Li Chao 

TITLE=Electrochemical behavior of Mg electrode in sodium salt electrolyte system

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.992400

DOI=10.3389/fchem.2022.992400

ISSN=2296-2646

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