RESULTS
The results of our analysis indicate that the MOF2H2 project has the potential to drive significant advancements in technology, particularly in the field of sustainable energy production. Furthermore, the project is expected to have positive environmental impacts, including reduced carbon emissions and improved air quality, while also promoting social well-being and economic growth through job creation and increased energy security.
Photocatalysis at the core of MOF2H2
(Scientific foundation – supports PR1, PR3 and PR4)
MOF2H2 investigates photocatalytic water splitting as a route to hydrogen production. In this process, Metal–Organic Frameworks (MOFs) absorb light energy and generate charge carriers capable of driving the separation of water into hydrogen and oxygen.
The project focuses on improving light absorption, charge separation efficiency and catalytic stability under realistic operating conditions. This light-driven mechanism forms the scientific basis of all subsequent developments within MOF2H2.
High-performance MOF Materials
A range of titanium- and copper-based MOFs were synthesised, modified and systematically evaluated under simulated solar irradiation.
Among the most promising materials:
- MIP-177 (Ti) demonstrated stable hydrogen evolution and strong structural integrity during repeated illumination cycles.
- MIP-818 showed high hydrogen production rates and reproducible performance.
- Copper-modified systems enhanced charge transfer and catalytic efficiency.
All materials were tested under controlled laboratory conditions, confirming both photostability and repeatability.
This corresponds to PR1, which focuses on the development and validation of advanced MOFs for overall water splitting.
From material to working prototype
(PR3 – Laboratory-Scale Photocatalytic System, TRL4)
To validate performance beyond material-level testing, a laboratory-scale photocatalytic prototype was developed.
The reactor operates under simulated solar irradiation and enables direct measurement of hydrogen production under controlled parameters. Testing confirmed operational stability, reproducibility, and successful integration of advanced MOF materials into a functional device.
This milestone corresponds to PR3 and represents Technology Readiness Level 4 (TRL4).
The prototype is presented as a platform system without specifying internal material configurations.
Engineering integration and manufacturing readiness
(PR4 – Process for Manufacture of MOF-Based Photocatalysts)
Beyond material discovery and system validation, the project addressed fabrication robustness and integration strategies.
MOFs were deposited as thin films on suitable substrates using optimised techniques to ensure homogeneous coatings, strong adhesion and preserved crystallinity while maintaining light accessibility.
Synthesis protocols were refined to improve reproducibility and functionalised materials, including polymer-modified MOFs, were developed to enhance durability and catalytic performance.
These developments support PR4, which focuses on manufacturing processes and preparation for future scale-up and sustainability assessment.
Learnings from our partners
A shared scientific ambition
Across the consortium, partners consistently point to the same thing that made MOF2H2 worth pursuing: the ambition to go beyond incremental improvements and demonstrate something genuinely new.
Developing noble-metal-free photocatalysts capable of overall water splitting, integrating fundamental materials science with device-level validation, and targeting a solar-to-hydrogen efficiency far above the current benchmark, these were not modest goals.
Beyond hydrogen production specifically, the project opened a broader understanding of MOF photophysics and created space for new chemistry, new composite materials, and new applications. That level of ambition, partners agree, is precisely what held the consortium together over three and a half years.
Challenges met, solutions found
No research project of this scale runs without obstacles. Partners faced laboratory closures, material compatibility issues, prototype degradation under outdoor conditions, and the everyday complexity of extracting reliable data from highly dynamic systems.
Reproducibility in catalytic performance was a recurring challenge, addressed by shifting focus toward material stability and identifying structurally more robust MOFs.
What stands out in partner reflections is not the challenges themselves, but the consistent willingness to adapt: refocusing synthesis strategies, developing new reactor components, coordinating across borders to keep work on track. Each obstacle became, in time, a result.
What the project leaves behind
Partners are clear that MOF2H2’s legacy goes well beyond its publications and prototypes. The project has strengthened individual teams’ expertise, expanded international networks, and established design principles that future projects can build on directly.
The consensus is that MOF2H2 has moved MOF-based photocatalysis from exploratory research toward application-oriented development, and that its insights are relevant not only for hydrogen production but also for CO2 reduction, pollutant degradation, and biomass valorisation.
Several follow-on proposals are already in preparation across the consortium, including national and European projects building directly on MOF2H2’s materials knowledge and prototype experience.
Looking ahead
Partners are aligned on what comes next. Hybrid approaches combining photocatalysis with electrolysis, continuous flow reactor configurations, and stronger focus on long-term stability are seen as the clearest pathway forward.
The results of the outdoor pilot tests will be decisive in shaping the next phase. As one partner put it, MOF2H2 should be seen as an important step toward an alternative pathway that could complement existing hydrogen technologies in the long term, not a replacement for them, but a credible and scalable addition to the clean energy toolkit.
Key recommendations from the consortium
Three and a half years of research across five countries generate more than scientific results. They generate hard-won practical knowledge. Here is what the MOF2H2 consortium would pass on to anyone looking to build on this work.
Prioritise stability and reproducibility over peak performance.
Chasing high activity figures is less productive than building materials that behave consistently. Standardising laboratory protocols is not a bureaucratic exercise but a technical necessity, one that makes the difference when it comes to scaling up and validating results under real outdoor conditions.
Engineer the interfaces, not just the components.
The interaction between MOFs and functional additives matters more than the individual performance of each element. Careful interfacial design, combined with thorough multi-technique characterisation, is the foundation on which reliable photocatalytic performance is built.
Integrate advanced characterisation with catalytic testing from the start.
Understanding charge separation dynamics, trap-state formation, and coordination effects is essential for meaningful progress. Spectroscopic insight and catalytic evaluation should go hand in hand, not follow one another.
Think beyond hydrogen.
The design principles developed within MOF2H2 are not hydrogen-specific. CO2 reduction, pollutant degradation, and biomass valorisation are all within reach of the same materials knowledge. Researchers who engage with these systems only through the lens of water splitting risk missing the broader photocatalytic potential the project has helped unlock.
Keep communication open across disciplines.
Early and direct dialogue between partners working on synthesis, characterisation, and application is essential for translating promising materials into functional systems efficiently. In a broad consortium, that openness is both the greatest asset and the most complex thing to maintain.