Hydrogen plays a key role in the search for future energy sources which reduce CO₂ emissions and provide a stable energy supply. Accordingly, the joint project "Neo-PEC" aims to develop a tandem module that will in future produce green hydrogen in a clean and cost-effective manner, thus enabling a decentralized hydrogen supply using an energy carrier which is transportable according to demand. With the help of the module, water is directly split into hydrogen and oxygen by photo-catalytic means (Photo Electro-Catalytic (PEC) Water Splitting). This novel technology does not require expensive electrolyzers and is scalable as required. For the three-year project "Neo-PEC", 3.4 million euros are being made available to the participating partners Fraunhofer IKTS, IST and CSP within the framework of the Fraunhofer internal funding program PREPARE.
The core of the new development is a tandem PEC module. In a tandem cell, a transparent carrier plate is coated on both sides with different semi-conductive materials. When sunlight hits it, the short-wave light is absorbed on one side (anode). At the same time, the long-wave light penetrates this upper layer and is absorbed on the reverse side (cathode). This releases hydrogen on the cathode side and oxygen on the anode side – a process now being optimized in the project.
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