Question

Difference between cathode and anode in points ​

Answer 1

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⚫ Anode

♦ The electrode connected to the positive terminal of the battery.

♦ Current enters the electrolyte through the anode.

♦ Anions migrate and discharge at the anode.

⚫ Cathode

♦ The electrode connected to the negative terminal of the battery.

♦ The battery current leave the electrolyte through the cathode.

♦ Cations migrate and discharge at the cathode

Answer 2

Answer:

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Cathode

• When we talk about cathode in chemistry, it is said to be the electrode where reduction occurs. This is common in an electrochemical cell. Here, the cathode is negative as the electrical energy that is supplied to the cell results in the decomposition of chemical compounds. However, it can also be positive as in the case of a galvanic cell where a chemical reaction leads to the generation of electrical energy.

• In addition, a cathode is said to be either hot cathode or a cold cathode. A cathode which is heated in the presence of a filament to emit electrons by thermionic emission is known as a hot cathode whereas cold cathodes are not heated by any filament. A cathode is usually flagged as “cold” if it emits more electrons compared to the ones generated by thermionic emission alone.

Anode

• In the most basic form, an anode in electrochemistry is the point where an oxidation reaction occurs. Generally, at an anode, negative ions or anions due to its electrical potential tend to react and give off electrons. These electrons then move up and into the driving circuit.

• If we take a galvanic cell, the anode is negative in nature and the electrons mostly move towards the external part of the circuit. In an electrolytic cell, it is again positive. Additionally, an anode can be a plate or wire having an excess positive charge.