Fuel cells rely on catalysts for both the anodic and cathodic reactions. The net current density is the difference between the cathodic and anodic current density. The ratio of the surface areas between the cathodic and anodic region is significant. Hbs isolated from the European eel can be separated into anodic and cathodic isoforms. The cathodic current is balanced by the anodic current. There are two types of EPD processes, anodic and cathodic. The reason for the two compartment cell is to separate cathodic and anodic reaction. A gold micro-electrode array was used for the cyclic voltammetry and anodic stripping voltammetry. This causes the passivation of steel at the anodic oxidation sites. Electrons flow from the anodic areas into the electrolyte as the metal corrodes. This TcO layer renders the steel surface passive, inhibiting the anodic corrosion reaction. This will give rise to electrolytic corrosion which will start from more anodic materials first. In this way, these metaloxo anions act as anodic corrosion inhibitors. Corrosion will occur at the area of low-oxygen concentration, which are anodic. Differing coefficients of thermal expansion pose challenges for anodic bonding.