How do Water Electrolysers work?
An electrolyser is a system that facilitates electrolysis - the breakdown of water into oxygen and hydrogen.
Electrolysers vary in form and function and, depending on the application, can be scaled up or down to produce energy outputs, but the process is essentially the same. In its most basic form, an electrolyser consists of an anode and a cathode separated by an electrolyte. In polymer electrolyte membrane (PEM) electrolysers, the electrolyte is a solid specialty plastic material, known as the ‘Proton Exchange Membrane’.
- Water reacts at the anode forming oxygen and positively charged hydrogen ions (protons)
- The electrons flow through an external circuit and the hydrogen ions selectively move through the PEM to the cathode.
- At the cathode, hydrogen ions combine with electrons from the external circuit to form hydrogen gas. Anode Reaction: 2H2O → O2 + 4H+ + 4e- Cathode Reaction: 4H+ + 4e- → 2H2
* TFP Hydrogen materials are used in the Porous Transport Layer (PTL) and we produce a range of anode and cathode catalysts.