The ability of hydrogen to react with oxygen was first noticed by Henry Cavendish in 1766. The first electrolyzer subsequently appeared in 1800, when Nicholson and Carlisle induced a static charge in water. From then until today, electrolyzers are used for a variety of applications.
The electrolyzer is an electrochemical device that separates water into its components - oxygen and hydrogen, by means of an electric charge. The process by which this reaction takes place is called electrolysis. The three main building blocks of the electrolyzer are a cathode (negative charge), a membrane, and an anode (positive charge). According to the type of the electrolyte, the electrolyzers could be the following: