CENmat

blog

Results and insights on AEM and PEM electrolysis, from materials to stacks and systems: our own data, EU project deliverables and peer-reviewed papers.

articles

Electrolyser short stack with a bolted metal end plate and black media hoses, set up for long-duration testing.
AEM membranes

AEM Membrane Durability: AionFLX™ Plus Passes 8,000 h

AionFLX™ Plus composite AEM membrane passes 8,000 h in 1 M KOH at 1 A/cm², still running, below 10 µV/h since hour 2,300. Conditions and data.

Roll-to-roll coating machine with a precision coating head, rollers and dryer section for continuous electrode production.
PEM catalysts

Ultra-Low Iridium PEM Catalyst: OXYGN-M Test Data

OXYGN-M ultra-low iridium PEM anode catalyst: 1.86 V at 2 A/cm² with only 0.2 mg Ir/cm², over 1,000 h without degradation at 80 °C. The data.

Electrolyser short stack with a bolted metal end plate, lifting eyes and insulated hoses, dramatically lit in a test hall.
Stacks & systems

AEM Electrolyser Stack: From 6 kW to 100 kW in HYScale

How HYScale went from 400 cm² cells to a validated 6 kW AEM short stack and a 100 kW system, now built and in commissioning. PFAS- and CRM-free.

Stack of large-area electrolysis cell components with frames, prepared for stack assembly.
EU projects

Large-Area AEM Electrolysis Cells: HYScale D3.1 Results

The public HYScale D3.1 report explained: 2.01 A/cm² at 2.01 V in 0.1 M KOH, under 5 µV/h over 330 h, and 2 A/cm² at 2.07 V on a large AEM cell.

Two large-area electrolysis electrodes side by side with a ruler for scale.
EU projects

CCS vs CCM in AEM Electrolysis: Lessons from NEWELY

Why the EU NEWELY project moved from catalyst-coated membranes to catalyst-coated electrodes for PGM-free AEM electrolysis, and scaled them to 200 cm².

Roll-to-roll web line: precision rollers guide a dark film web between unwind and rewind stations.
AEM membranes

Scaling AEM Membrane Manufacturing: Lessons from HYScale

How HYScale took the AionFLX™ AEM from lab films to 900 cm² sheets and 100 kW batch volumes, and what buyers should ask about membrane scale-up.

Detail of a roll-to-roll coating line with web-guiding rollers and dryer housing.
PEM catalysts

PROMET-H2: Ultra-Low Iridium Catalyst Chosen for PEM Stacks

In PROMET-H2, CENmat scaled up an ultra-low iridium catalyst chosen for the stack MEAs: 0.2 mg Ir/cm², 2 A/cm² at 1.9 V target, stack CAPEX −21 %.

Machined stack end plates and cell frames laid out on a workshop table.
Technology

PFAS-Free Electrolysers: It's Not Only the Membrane

Takeaways from the 2026 HYScale, FASTCH2ANGE and PROMISERS workshop: PFAS hide in seals, gaskets, coatings and tubing, and testing must catch up.

Detail of an electrolyser stack end plate with compression fittings, bolts and insulated hoses.
Stacks & systems

From DLR Spin-off to Licensee: Bringing the Stack to Market

CENmat has licensed the design of a DLR-developed electrolyser prototype to bring it to market. What the tech transfer means for AEM and PEM customers.

Cutaway view of a containerised electrolysis system showing piping, tanks and balance-of-plant equipment.
Technology

Alkaline vs PEM vs AEM Electrolysis: The Materials Question

Alkaline, PEM or AEM electrolysis? A materials-first comparison of iridium, PFAS and critical raw material exposure, and what each means at gigawatt scale.

Close-up of a thin, translucent membrane sheet with the CENmat logo visible through it.
EU projects

PFAS-Free Bipolar Membranes for Electrolysis: REDHy

How CENmat built PFAS-free, CRM-free bipolar membranes in the EU project REDHy: 1 A/cm² at 2 V, scaled to more than 400 cm², with the data behind it.

Long roll-to-roll production line in an industrial hall, symbolising scale-up of electrode manufacturing.
Research papers

Ultra-Low Iridium PEM Anode: 2.82 A/cm² at 2 V

Peer-reviewed: an ultra-low iridium PEM anode with 0.2 mg Ir/cm² beat a 2 mg Ir/cm² reference, reaching 2.82 A/cm² at 2 V and 80 °C. Paper summary.

Understanding the Green Hydrogen Definition According to the EU's Delegated Act
Regulation

Understanding the Green Hydrogen Definition According to the EU's Delegated Act

Understanding the EU Delegated Act definition of green hydrogen for compliance and offtake.

World Energy GH2's Green Hydrogen Project: A Leap Towards Renewable Energy
Technology

World Energy GH2's Green Hydrogen Project: A Leap Towards Renewable Energy

World Energy GH2’s project illustrates large-scale green hydrogen ambition.

Maritime Action and Investment: An Urgent Call for Increased Pace and Scale
Maritime

Maritime Action and Investment: An Urgent Call for Increased Pace and Scale

Maritime action and investment must accelerate to meet decarbonisation ambitions.

Green Hydrogen for Industrial Heat: A Game-Changer in Renewable Energy
Industrial Heat

Green Hydrogen for Industrial Heat: A Game-Changer in Renewable Energy

Green hydrogen for industrial heat is emerging as a key player in the renewable energy transition.

Archive: short topic notes (50)

Ready to evaluate AionFLX™, OXYGN or H2GN? See products (including AionFLX™ ionomers, OXYGN ultra-low iridium PEM catalysts and HYScale stacks), try the AEM vs PEM iridium calculator and the LCOH calculator, get the AEM qualification pack, meet us at events, read the FAQ, or get in touch for paid samples.