Gen 25 Hydrogen Generator PEM system by HFS Feb. 2026

Gavan Knox 

HFS 61 403177183

gavan@hfuel.com.au

https://hydrogenfuelsystems.com.au

 

Producing Hydrogen using our PEM Hydrogen generator system

a PEM system can be used to generate hydrogen gas, and in fact it’s one of the most efficient and widely adopted technologies for clean hydrogen production today.

What a PEM System Actually Does

A PEM (Proton Exchange Membrane) electrolyser splits water into hydrogen and oxygen using electricity. The membrane only allows protons (H⁺ ions) to pass through, which makes the process:

• Highly efficient
• Fast‑responding (great for renewable energy)
• Compact and lightweight
• Capable of producing high‑purity hydrogen

🔬 How It Works (simple breakdown)

1. Water enters the anode side
2. Electricity splits water into:
   • H⁺ ions (protons)
   • O₂ gas
   • Electrons
3. Protons pass through the membrane
4. Electrons travel through the external circuit
5. On the cathode side, protons + electrons combine → H₂ gas

So yes — a PEM system is literally designed to generate hydrogen gas on demand.

🚛 Why PEM is popular for fuel systems (including automotive & industrial)

• Produces very clean hydrogen (99.999% purity)
• Works at low temperatures (50–80°C)
• Responds instantly to load changes
• Ideal for pairing with solar/wind
• Compact enough for mobile or vehicle‑mounted systems

Given your work with hydrogen fuel systems, PEM tech is often used when you need controlled, high‑purity hydrogen rather than the more brute‑force HHO cell approach.

If you want, I can compare PEM vs alkaline vs HHO dry‑cell systems in terms of efficiency, cost, safety, and suitability for vehicle retrofits.

Our PEM system does not require acids to supply the Hydrogen ions fo produce Hydrogen Gas

A PEM system works very differently from the alkaline/HHO setups you’re used to, so it’s worth breaking it down clearly.

A PEM (Proton Exchange Membrane) electrolyser uses:

• Pure water (deionised water)
• A solid polymer membrane (usually Nafion)
• Catalyst-coated electrodes (typically platinum‑group metals)

There is no liquid acid or alkaline electrolyte involved.

The membrane itself is a solid polymer that contains fixed sulfonic acid groups, but these are chemically bound inside the membrane. They don’t dissolve into the water and they don’t behave like a free acid solution.

So the system is not “using acid” in the way an HHO cell uses KOH or NaOH.

⚡ Why PEM Doesn’t Need Acid or KOH

The membrane performs the job that liquid electrolytes do in other systems:

• It conducts protons (H⁺) across the membrane
• It blocks gases (keeps H₂ and O₂ separated)
• It maintains the internal chemistry without needing added chemicals

Because of this, PEM systems:

• Run on pure water only
• Produce very high‑purity hydrogen
• Avoid corrosion and contamination issues
• Are safer and cleaner than alkaline cells

🆚 PEM vs Alkaline/HHO Electrolysers

Feature	PEM Electrolyser	Alkaline/HHO Cell
Electrolyte	None (pure water only)	KOH or NaOH solution
Membrane	Solid polymer (Nafion)	None
Gas purity	Very high	Lower
Maintenance	Low	Requires electrolyte changes
Corrosion	Minimal	High
Efficiency	High	Moderate

Given your experience with HHO systems, PEM is basically the “clean, high‑tech” version of electrolysis.

If you want, I can walk you through whether a PEM system could replace or supplement your current HHO setups, or whether it’s practical for vehicle‑mounted hydrogen assist systems.

What is the makeup of the electrodes in a Electrolysis system and in a PEM electrolyser

A PEM electrolyser uses very specific, high‑performance electrodes, and they’re quite different from the stainless‑steel plates you use in HHO dry cells.

Here’s the clear breakdown.

⚡ The Electrodes Used in a PEM Hydrogen Generator

A PEM system has two catalyst‑coated electrodes:

1. Anode (Oxygen Evolution Electrode)

• Typically made from titanium (as the structural substrate)
• Coated with iridium oxide (IrO₂) or ruthenium oxide (RuO₂)
• Purpose: splits water into O₂ + H⁺ + electrons

Titanium is used because it resists corrosion in the acidic environment created inside the membrane.

2. Cathode (Hydrogen Evolution Electrode)

• Usually made from carbon paper or titanium mesh
• Coated with platinum (Pt)
• Purpose: combines H⁺ + electrons → H₂ gas

Platinum is used because it’s the most efficient catalyst for hydrogen formation.

🧪 Why These Materials Are Needed

PEM membranes (like Nafion) contain fixed sulfonic acid groups, so the internal environment is mildly acidic. That means:

• Stainless steel would corrode
• Aluminium would dissolve
• Nickel would degrade
• Only titanium + noble metal catalysts survive long‑term

This is why PEM systems are more expensive but also far more efficient and durable.

🔍 Quick Summary Table

Component	Material	Catalyst	Function
Anode	Titanium	IrO₂ or RuO₂	Produces O₂ and H⁺
Cathode	Carbon or titanium	Platinum	Produces H₂
Membrane	Nafion	—	Conducts protons only

If you want, I can compare PEM electrodes vs HHO dry‑cell plates so you can see exactly why PEM behaves so differently from your current systems.

Does a PEM system produce more hydrogen than an electrolysis system

Great question, and it gets right to the heart of why PEM systems are so different from the HHO/alkaline electrolysers you’ve worked with.

⚡ Does a PEM system produce more hydrogen than a normal electrolysis system?

Not automatically. All electrolysis systems—PEM, alkaline, HHO dry cells—are governed by the same physics:

So if two systems both run at, say, 20 amps, they will produce roughly the same amount of hydrogen, because Faraday’s laws don’t change.

But here’s the important part:

🔍 Where PEM does outperform traditional electrolysis

PEM doesn’t magically break the laws of electrochemistry. What it does do is convert more of your electrical power into actual hydrogen instead of heat, losses, or side reactions.

PEM advantages

• Higher efficiency (typically 60–70%, sometimes higher)
• Lower internal resistance
• No electrolyte contamination
• Better gas separation (H₂ and O₂ don’t mix)
• Can run at higher current densities without overheating

What this means in practice

At the same electrical input, a PEM system often produces:

• More usable hydrogen per watt
• Cleaner hydrogen
• More stable output
• Less heat loss

So while the raw volume of hydrogen per amp is similar, PEM gives you more hydrogen per unit of energy, especially at higher loads.

🆚 PEM vs HHO Dry Cell (your typical setup)

Feature	PEM Electrolyser	HHO Dry Cell
Efficiency	High	Moderate
Gas purity	Very high (99.999% H₂)	Mixed HHO gas
Heat generation	Low	High
Current density	Very high	Limited
Maintenance	Low	High
Gas separation	Yes	No (H₂ + O₂ mixed)

A PEM system is like a precision instrument. An HHO dry cell is more like a brute‑force generator.

🎯 Bottom line

• PEM does not produce more hydrogen simply because it’s PEM.
• But it produces hydrogen more efficiently, more cleanly, and more safely.
• At high current levels, PEM outperforms HHO cells because it wastes far less energy as heat.

If you want, I can run a comparison using your typical HHO cell specs (amps, voltage, plate count, electrolyte concentration) and show exactly how much hydrogen a PEM stack would produce at the same electrical input.

 

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Tuesday, February 3, 2026