1.What is PEM electrolysis?
Proton exchange membrane electrolysis (PEM electrolysis) is an electrochemical process for producing hydrogen by means of water electrolysis. The process uses an electrolyzer that contains an anode and a cathode. The anode and cathode are separated electrically by a proton exchange membrane, which is also called a polymer electrolyte membrane. When the electrolysis process runs on electricity from renewable energy sources such as solar power, hydropower, or wind power, the hydrogen produced is known as green hydrogen.
2.How does PEM electrolysis work?
In PEM electrolysis, ultrapure water flows around a proton exchange membrane (PEM). Located between the anode and the cathode, this membrane is ionically conductive. When an electric voltage is applied to both electrodes, the water on the anode side oxidizes to oxygen, free electrons, and hydrogen ions (Oxygen Evolution Reaction, OER). The ions pass through the membrane by diffusion. They then combine with the electrons at the cathode side to form hydrogen gas (Hydrogen Evolution Reaction, HER). The reaction products of PEM electrolysis are hydrogen and oxygen.
3.What is a PEM electrolyzer?
A PEM electrolyzer is a system that splits water into its component parts of hydrogen and oxygen by means of an electrochemical reaction. The hydrogen produced in this way is used as an efficient energy source. We manufacture the most important component of a PEM electrolyzer – the stack, which is, in a sense, the beating heart of water electrolysis. There is a great range of areas of application – and the dimensions of electrolysis systems vary greatly, too. They range from decentralized hydrogen production for covering industrial companies’ own needs through to large-scale systems for industrial hydrogen applications or for companies that produce hydrogen on a large scale for export purposes.
4.What are the system benefits of PEM electrolysis?
Compared to other electrolysis methods, such as alkaline electrolysis (AEL), PEM water electrolysis boasts a number of key benefits, including high power density, high energy efficiency, and high hydrogen output pressure. There are other advantages to sing PEM electrolyzers, too – they offer maximum flexibility, require very little space, and can be scaled with ease. What’s more, this process is very safe and reliable, making it the ideal technology when combined with renewable energy resources such as wind and solar power.
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