1. Carbon electrode: Carbon electrodes are known for their high electrical conductivity, making them suitable for various electrochemical applications. 2. Platinum electrode: Platinum electrodes are highly stable and resistant to corrosion, making them ideal for use in harsh chemical environments. 3. Silver/silver chloride electrode: Silver/silver chloride electrodes have a stable potential and are commonly used in pH measurements and other electrochemical applications. 4. Gold electrode: Gold electrodes have excellent biocompatibility and are often used in biomedical applications such as biosensors and implantable devices.