The working principle of hydrogen fuel cell
The hydrogen-oxygen fuel cell does not require a device in which the reducing agent and the oxidizing agent are all stored in the battery.
The fuel (hydrogen) is supplied to the negative electrode during operation, and the oxidant (oxygen) is supplied to the positive electrode. Hydrogen is decomposed into positive ions H + and electrons under the action of the catalyst on the negative electrode. Hydrogen ions enter the electrolyte, while the electrons move along the external circuit to the positive electrode. The load of electricity is connected to the external circuit. At the positive electrode, oxygen is absorbed by the hydrogen ions in the electrolyte to reach the electrons on the positive electrode to form water. This is the reverse process of the electrolysis of water.
When the hydrogen fuel cell is operated, hydrogen is supplied to the hydrogen electrode, and oxygen is supplied to the oxygen electrode. Hydrogen, oxygen on the electrode under the action of the catalyst, through the electrolyte to generate water. At this time in the hydrogen electrode with excess electrons and negatively charged, in the oxygen electrode due to lack of electrons and positive electricity. When the circuit is turned on, this reaction process, which is similar to combustion, can be carried out continuously.
Hydrogen fuel cell with hydrogen as fuel as a reducing agent, oxygen as oxidant, through the fuel combustion reaction, the chemical energy into electricity battery, and the original battery works the same.
