To produce cost-effective green hydrogen, industry and energy companies need efficient electrolyzers on a large scale. Technologies such as pressurized alkaline or high-temperature electrolysis are already being installed in industrial environments. Another approach that shows promise is the anion exchange membrane (AEM) technology.
AEM electrolysis combines the respective technical advantages of polymer exchange membrane electrolysis (PEM) and alkaline electrolysis (AEL). High power density, flexibility and high gas purity are qualities that AEM technology has in common with PEM technology. In addition, AEM technology is characterized by its cheap and non-critical materials—similar to AEL technology. Thus, AEM electrolysis has the potential to set new standards in the electrolysis market regarding both operating and investment costs.
However, commercially available membranes lack sufficient stability in alkaline environments, which have limited the widespread adoption of AEM in electrolysis applications.
Electrolysis company Sunfire now also aims to validate these advantages within the “Integrate” project. Together with the research institute Fraunhofer IFAM and the Canadian partners Ionomr Innovations, The National Research Council of Canada (NRC), the Simon Fraser University and the University of Alberta, the company is collaborating to develop an AEM electrolyzer in the upper double-digit kW range and to validate its technical feasibility under industrially relevant conditions for further scale-up.
At its Dresden site, Sunfire will provide a test stand with an electrolysis cell to measure the AEM stack’s performance.
Both Sunfire and Fraunhofer IFAM have many years of expertise in the field of electrolysis. While Sunfire as an electrolyzer manufacturer has its main competence in electrolysis technologies and system integration, Fraunhofer IFAM as a non-university institution focuses on applied research and the development and qualification of materials for alkaline stacks.
Ionomr Innovations manufactures Aemion+, a durable and high-performance anion exchange product.
In the “Integrate” project, the institute designs and optimizes long-term stable, high-performance non-platinum groups of metal catalysts for use in dilute alkaline environments. In addition, porous transport layers (PTL) are optimized. Once promising catalysts and a PTL have been identified, Fraunhofer IFAM will produce electrodes that will be tested at Sunfire’s industrial test environment. Based on the results, the test rig will be modified accordingly to be operational for long-term AEM operation.
Ionomr’s Aemion+ alkaline membranes being used in this application are durable, ultra-stable and maximize performance without the traditional expensive components for water electrolysis—like iridium, platinum, and titanium—replacing these with less expensive materials, such as those developed by Fraunhofer IFAM. Aemion allows for longer lifetimes in highly basic environments, is developed with industrial applications in mind and available at commercial scale, and importantly, does not use perfluoro sulfonic acid (PFSA) materials that are becoming increasingly discontinued worldwide due to environmental concerns.
—Ionomr Innovations’ CEO Bill Haberlin
The project has been funded by the German Federal Ministry of Education and Research (BMBF) for three years.
