Evonik: Pilot Plant in Marl Starts Production of AEM Membranes for Green Hydrogen

Evonik has commissioned a pilot plant in Marl for the production of its anion-conducting polymer membrane “Duraion.” The membrane is designed for AEM electrolysis and is intended to reduce the cost of green hydrogen production.

According to the company, the facility can produce membranes annually for electrolyzers with a combined capacity of up to 2.5 gigawatts. This corresponds to around one quarter of the electrolyzer capacity planned in Germany by 2030. With the start of production, Evonik is transferring the technology from laboratory scale to continuous manufacturing.

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AEM electrolysis is considered an alternative to established electrolysis technologies. It operates in an alkaline environment, enabling the use of materials that do not require precious metals. According to Evonik, this can significantly reduce capital expenditure; industry studies estimate the potential savings at at least 25 percent. In addition, hydrogen can be produced directly under pressure, potentially eliminating the need for additional compression steps.

According to the company, the “Duraion” membrane combines high ion conductivity with chemical and mechanical stability. It reliably separates hydrogen and oxygen and is designed for high current densities and pressures. No PFAS are added during production. An optional fabric reinforcement can be integrated to support use in large-scale electrolyzer systems.

The coating line in Marl is approximately 20 meters long and produces membranes up to one meter wide. Evonik also highlights its full backward integration, from the starting molecules to the finished membrane roll. Initial AEM electrolyzer manufacturers are already using the membranes in pilot production facilities and demonstration plants.

Alongside the production launch in Germany, Evonik is opening the AEM Center Shanghai. The application technology center will test membranes produced in Marl under industrial conditions and support the integration of AEM technology into hydrogen applications. The site is aimed at international customers and particularly addresses the growing Chinese market.

More information: www.evonik.de

Evonik Industries AG, Essen

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