Cathode

Definition

The cathode is the electrode where reduction occurs in an electrochemical cell, drawing positive ions from the electrolyte. It serves as the source of electrons in a direct-current circuit.

5 Must Know Facts For Your Next Test

1. In a galvanic cell, the cathode is positively charged.
2. In an electrolytic cell, the cathode is negatively charged.
3. Electrons flow towards the cathode in both types of electrochemical cells.
4. Reduction reactions at the cathode involve gain of electrons.
5. Cathodes are critical components in devices such as batteries and diodes.

Review Questions

• What role does the cathode play in an electrochemical cell?
• How does the charge of a cathode differ between galvanic and electrolytic cells?
• Why are reduction reactions significant at the cathode?

Related terms

Anode: The electrode where oxidation occurs, releasing electrons into the external circuit.

Electrolyte: A substance containing free ions that make it electrically conductive, used in electrochemical cells.

Electromotive Force (EMF): $EMF$ denotes the voltage generated by a source like a battery or generator, driving current through a circuit.