What methods are used to prevent corrosion of electrodes?

Several methods are used to prevent corrosion of electrodes in TENGs, including using corrosion-resistant materials, applying passivation layers, and using protective coatings. Corrosion-resistant materials, such as gold, platinum, or stainless steel, are inherently resistant to oxidation and other forms of corrosion. However, these materials can be expensive. Passivation layers involve forming a thin, protective oxide layer on the electrode surface, preventing further corrosion. For example, anodizing aluminum electrodes creates a layer of aluminum oxide that inhibits further oxidation. Protective coatings involve applying a thin layer of a corrosion-resistant material, such as a polymer or a ceramic, to the electrode surface. These coatings act as a barrier, preventing corrosive agents from reaching the electrode material. For example, coating a copper electrode with a thin layer of parylene can protect it from oxidation. The choice of method depends on the electrode material, the operating environment, and the cost constraints.