Key takeaways
- 2 H₂O → 2 H₂ + O₂ at the cathode and anode.
- PEM membrane keeps H₂ and O₂ physically separated.
- DC voltage, stack area and water purity set the achievable flow rate.
The reaction
Water molecules at the anode lose electrons to form O₂ and H⁺. The protons cross the PEM membrane to the cathode, where they pick up electrons and combine to form H₂.
The H₂ stream is vented to the user outlet. The O₂ stream is vented to atmosphere.
What sets output
Flow rate is roughly proportional to current density across the active membrane area. Doubling output usually means doubling stack area, current, and cooling capacity.
Frequently asked questions
On-demand generation avoids pressurised storage and the regulations that come with it.
Related products
Related learning
Next lesson
PEM vs SPE technology
Continue →Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — model-specific gas composition from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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Source content adapted from technology.
