In cathode half -cell reduction occur in the voltaic cell.
Chemistry terminology refers to the cathode as the electrode where reduction takes place. In an electrochemical cell, this happens frequently. As a result of chemical molecules being broken down by the electrical energy that is provided to the cell, the cathode is negative in this instance. In a galvanic cell, however, a chemical reaction results in the production of electrical energy. This is an example of a positive galvanic reaction.
A cathode is often referred to as a hot cathode or a cold cathode. A hot cathode is one that has been heated by a filament in order to emit electrons by thermionic emission, as opposed to a cold cathode, which has not been heated by a filament. If a cathode emits more electrons than those produced by thermionic emission alone, it is typically labeled as "cold."
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