The Marl pilot plant is producing the polymer membrane for anion exchange membrane (AEM) electrolysis at commercial scale. The facility has capacity for membranes supporting up to 2.5 GW of electrolysis per year, and the coating system is nearly 20 m long. It produces membranes up to 1 m wide for large-scale electrolyzers.

AEM electrolysis is positioned as an alternative to established electrolysis technologies that are either limited in efficiency or require high investment. The technology operates in an alkaline environment, allowing the use of precious-metal-free materials. Techno-economic studies cited by Evonik estimate that AEM electrolysis could reduce investment costs by at least 25%. The process can also produce hydrogen directly under pressure, removing the need for additional compression stages.

Evonik developed the DURAION^® membrane as a key component for this process. The membrane combines high ion conductivity with chemical and mechanical stability, and it is designed for operation at high current densities and pressures. It also separates hydrogen and oxygen to prevent explosive gas mixtures. No PFAS are added during its production.

The development work was carried out by the team of Christian Däschlein together with experts from Evonik’s High Performance Polymers business line. Early manufacturers of AEM electrolyzers are already using the membranes in pilot production and demonstration plants. The Marl facility also allows optional fabric reinforcement for use in large-scale systems.

“Our membrane delivers high performance while reducing investment costs, enabling the innovative AEM technology to achieve a breakthrough in hydrogen production,” said Christian Däschlein, Head of the New Growth Area AEM in Evonik’s Innovation Factory.

“Our strength lies in complete backward integration – from the starting molecules to the finished membrane roll. This allows us not only to deliver large volumes but also to ensure excellent product performance with consistently high quality,” added Däschlein.

The company has also opened the Evonik AEM Center Shanghai to test membranes produced in Marl with local partners and customers under real operating conditions.

Source:  Hydrogentechworld