Controlling Magnesium Self-Corrosion in Mg–Air Batteries with the Conductive Nanocomposite PANI@3D-FCNT

[Image: see text] A promising potential device for storage of large amounts of energy is Mg–air batteries. However, the corrosion of the Mg electrode inside the battery electrolyte limits the battery’s capacity to store energy. We present a new strategy to protect the Mg electrode from corrosion and increase the life cycle of Mg batteries in this article. The Mg electrode is coated with a conductive nanocomposite (PANI@3D-FCNT) in this technique. To better understand the anticorrosion properties of PANI@3D-FCNTs and their effect on the battery efficiency, electrochemical and battery tests are used. We discovered that PANI@3D-FCNT plays the most promising role in reducing Mg electrode corrosion in 3.5 wt % NaCl electrolyte, with an efficiency of 93.9%. The battery with the coated Mg electrode has a longer discharge time and a slower drop in operating voltage. The PANI@3D-FCNT nanocomposite will prolong the life of the Mg–air battery and keep the Mg electrode active for a long time. This work outstandingly provides an effective strategy to address the defects in the Mg–air batteries arising from electrode corrosion successfully. The work is a great way to open up new avenues for introducing new conductive nanocomposites in metal–air battery designs without using traditional methods.