The “HollowEL” project develops novel manufacturing processes for an innovative design of PEM electrolysis cells. The core concept is a bubble-free electrolysis approach, in which water is directly supplied into the polymer membrane. This enables a reduction of energy losses and significantly increases the overall efficiency of hydrogen production.
A concept that has already been successfully demonstrated at laboratory scale is further developed with a clear focus on industrial applicability. Materials, cell geometries, and production processes are optimized to enable larger cell formats and scalable manufacturing. A key component of this development is the use of hollow fiber-reinforced membranes, which improve mechanical stability, manufacturability, and reliability while also offering potential for cost reduction.
Fraunhofer IMWS is responsible for the overall project coordination and leads the validation of the membrane composites based on a patented approach. Through a combination of modeling and experimental analysis, key processes such as water transport, ion conduction, and operational behavior are investigated in detail. The goal is to optimize materials and designs and to derive reliable design and operating guidelines for electrolysis cells and stacks.
Fraunhofer Center for Silicon Photovoltaics CSP