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Beyond Water: Deep Eutectic Solvents Enable Dye-Sensitised Photocatalytic Hydrogen Production
Chiara L Boldrini1, Giorgia Salerno1, Filippo M Perna2
1Department of Materials Science, Solar Energy Research Center MIB-SOLAR, Consorzio CINMPIS and Consorzio INSTM, University of Milano-Bicocca, Milano, Italy.
Chemsuschem
|May 8, 2026
Summary
This study introduces deep eutectic solvents (DESs) for dye-sensitized photocatalytic hydrogen evolution, significantly boosting efficiency. These sustainable solvents offer a greener alternative to water for enhanced solar fuel production.
Area of Science:
- Green Chemistry
- Materials Science
- Photocatalysis
Background:
- Conventional photocatalytic hydrogen evolution often relies on large volumes of water.
- Developing sustainable and efficient reaction media is crucial for advancing solar fuel technologies.
- Deep eutectic solvents (DESs) present promising eco-friendly alternatives to traditional solvents.
Purpose of the Study:
- To demonstrate dye-sensitized photocatalytic hydrogen evolution in DESs.
- To investigate the impact of DES properties on photocatalytic performance.
- To explore DESs as sustainable reaction media for hydrogen production.
Main Methods:
- Utilized platinum-decorated TiO2 nanoparticles sensitized with carbazole-based organic dyes.
- Conducted photocatalytic experiments in hydrophobic and hydrophilic DESs using water as the proton source.
- Employed physicochemical characterization techniques (UV-Vis, CV, TEM, IR, N2 physisorption).
Main Results:
- DES-based systems showed significantly enhanced hydrogen production rates and efficiencies compared to aqueous systems.
- The highest photocatalytic activity was observed in heterogeneous dye-DES combinations, contrary to expected dye-solvent affinity.
- Photocatalytic performance was found to be critically dependent on dye functionalization, DES polarity, and interfacial solvation.
Conclusions:
- DESs are effective, low-cost, and reusable reaction media for photocatalytic hydrogen evolution.
- Solvent engineering in DESs offers new strategies for optimizing photocatalytic systems.
- This work paves the way for next-generation, sustainable solar fuel production technologies.
