25

2023

-

07

The difference between primary battery and electrolytic cell


Primary cell and electrolytic cell are two common electrochemical devices, which have some differences in structure and working principle.

First of all, the primary battery is a device that can convert chemical energy into electrical energy. It consists of two electrodes and a medium, and a chemical reaction occurs inside. One of the electrodes is oxidized, releasing electrons; the other electrode is reduced, accepting electrons. The electrons generated by this electrochemical reaction flow in an external circuit, forming an electric current. A primary battery is a device that can provide continuous electrical energy, but once the chemical reaction stops, the battery will not continue to work.

An electrolytic cell is a device that converts electrical energy into chemical energy using an external power source. It also consists of two electrodes and a medium, but the functions of the two electrodes are exchanged. An external power supply will provide electrons to cause an oxidation reaction at one electrode; the other electrode will accept electrons for a reduction reaction. This chemical reaction will result in electrolysis of the substance, I .e. decomposition into ions. Electrolytic cells are mainly used in electrolytic processes, such as electroplating, electrolysis of water to produce hydrogen, etc.

In general, a primary battery is a device that converts chemical energy into electrical energy, while an electrolytic cell is a device that converts electrical energy into chemical energy. They differ in principle of operation and field of application.