Hidden Champion #5 - Photreon
Key Facts
Company: Photreon
Location: Karlsruhe, Germany
Foundation: 2025 (KIT spin-off)
Technology: Photocatalytic water splitting (direct conversion of sunlight into hydrogen)
Area of application: Decentralized hydrogen production, industry, energy supply
Special feature: replaces photovoltaics + electrolysis with a single process step
Key raw materials: Gallium (e.g. in gallium nitride as a light-active semiconductor material)
The electrolyzer becomes superfluous: Photreon produces hydrogen directly from sunlight
Green hydrogen is seen as the key to the climate-friendly transformation of industry and the energy system. But getting there has been complicated so far. First, electricity is generated. Then it is converted into hydrogen by electrolysis. A multi-stage process – expensive, energy-intensive and dependent on infrastructure.
Photreon eliminates precisely this detour.
The Karlsruhe spin-off is developing a photoreactor panel that produces hydrogen directly from sunlight and water. No electrolyzer. No power grid. Just light, water and material.
What sounds like a simplification changes the logic of the system.
The technological basis is photocatalysis. Unlike photovoltaics, light is not first converted into electricity, but is used directly for a chemical reaction. Light-active materials absorb the sun’s energy, excite electrons and split water directly into hydrogen and oxygen. Two process steps become one.
Photovoltaics and electrolysis merge.
Photreon has transferred this principle into a new type of photoreactor panel. The reactor geometry ensures that light guidance, reaction and material transport interact optimally. A prototype on a square meter scale already shows that this not only works in the laboratory, but also in the system.
The next step is scaling.
This is where it gets exciting. This is because the technology is designed to work with low-cost materials and can be manufactured on an industrial scale. It has a modular structure and can be used flexibly.
This changes the logic of the application.
Hydrogen no longer has to be produced and distributed centrally. It can be produced where it is needed. In the industry. On site. Even where there are no grids.
This is more than just efficiency. It is a system change.
Away from infrastructure, towards materials and technology.
Photocatalysis shows: The future of hydrogen will not only be decided in the energy system, but also in material design.
And that is precisely why Photreon is a hidden champion that should be on your radar right now.