PEM Hydrogen Generators
A PEM hydrogen generator produces hydrogen on demand by splitting purified water across a solid proton-exchange membrane, without a liquid caustic electrolyte and without stored bulk gas.
- The electrolyte is a solid polymer membrane, not a potassium hydroxide solution.
- Hydrogen is generated while the unit runs, so no pressurised storage vessel is required.
- Feed water is deionised; dissolved solids are removed upstream of the stack.
Mechanism
A PEM generator applies DC across a membrane electrode assembly. Water is oxidised at the anode, protons migrate through the membrane, and hydrogen is reduced at the cathode. Output flow tracks applied current, so production is modulated electrically rather than by valving a stored supply.
- Anode: water oxidation releases oxygen and protons.
- Membrane: proton conduction, gas separation.
- Cathode: proton reduction produces hydrogen.
PEM purity
Because the cell contains no dissolved alkali, the gas stream leaving a PEM stack does not carry entrained caustic aerosol. Residual moisture is the dominant contaminant and is addressed by drying and filtration stages appropriate to the downstream duty.
Production
Generator sizing is expressed as nominal hydrogen volumetric output at a stated pressure and temperature, together with electrical input and feed-water quality requirements. Duty profile — continuous, intermittent or modulated — determines stack and balance-of-plant selection.
Industrial and consumer applications
Industrial duty covers hydrogen supplied to combustion equipment such as engines, boilers and furnaces. Consumer modalities are separate, non-industrial applications documented on HydrogenMachines. The production hardware discussion is common to both; the application context is not.
Reference material only. CE Global publishes hydrogen production and PEM electrolysis engineering information. Nothing here is a medical, health, performance, emissions or fuel-saving claim.