Effect of Additives on Electrochemical and Corrosion Behavior of Gel Type Electrodes for Zn-Air System

The corrosion behavior of the Zn anode is yet another major issue to be taken under consideration in the Zn-air system. In order to enhance electrochemical performance, a new aim is to find a possible delay in corrosion rates using 1 and 3 wt % of Bi or Ni as additives when compared with pure Zn anodes as gel type electrodes. Through Tafel extrapolation, the pure and 3 wt % Bi added Zn anodes show a 1.2718 mA and 0.8490 mA average corrosion current, respectively. Furthermore, the Zn anode with 3 wt % Bi shows increased 1328.9 O charge transfer resistance and lowered hydrogen evolution, meaning Bi is an effective additive for controlling the hydrogen evolution reaction as well as corrosion reaction in gel type electrodes.