A PEM (Proton Exchange Membrane) Hydrogen Electrolyzer is a device used to split water into its constituent elements, hydrogen and oxygen, using electricity. This process, known as electrolysis, occurs within a specially designed cell that contains a proton exchange membrane.

During operation, water is fed into the electrolyzer, and an electric current is applied across the electrodes within the cell. The PEM membrane selectively allows protons to pass through while blocking the passage of gases, enabling the separation of hydrogen and oxygen.

The hydrogen gas produced at the cathode can be collected for various applications, including fuel cells, energy storage, and industrial processes, while the oxygen gas generated at the anode is typically released into the atmosphere.

PEM electrolyzers are favored for their high efficiency, fast response times, and ability to operate at low temperatures and pressures. These characteristics make them suitable for a wide range of applications, from small-scale renewable energy systems to large industrial installations seeking to produce green hydrogen for clean energy purposes.