Key takeaways
- PEM electrolysis uses a solid polymer membrane to conduct protons between electrodes.
- No liquid electrolyte is required — the cell runs on distilled or RO water.
- H₂ and O₂ streams are physically separated by the membrane.
- Cells can start and stop quickly, which suits on-demand inhalation use.
- The Hydrogen Machines inhaler range is built on PEM cell technology.
How PEM electrolysis works
A PEM cell sandwiches a solid polymer membrane — typically a perfluorosulfonic-acid material — between two catalyst-coated electrodes. Pure water is fed to the anode side, where it is split into oxygen, protons (H⁺) and electrons. The protons migrate through the membrane to the cathode side and recombine with electrons to form hydrogen gas. The membrane physically separates the two gas streams.
Because the proton path is through a solid polymer, no liquid electrolyte is needed. Power, water purity and membrane area determine output.
Why PEM dominates consumer hydrogen equipment
PEM cells start and stop quickly, run quietly, separate the gas streams cleanly, and need only distilled or RO water as a consumable. These properties suit on-demand inhalation sessions and household installation.
Water requirements
PEM cells are sensitive to ionic contamination of the feedwater. Distilled or reverse-osmosis water is specified. Tap water and mineral water shorten cell life and should not be used unless the manual explicitly permits it.
Maintenance characteristics
There is no liquid electrolyte to manage. Routine maintenance is limited to distilled-water refills and a periodic rinse cycle as specified by the manufacturer.
Frequently asked questions
Related products
Related learning
Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — 99.991% certified purity from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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