Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.274
Publication date: 18th December 2023
To master the energy transition, green hydrogen is heavily discussed as a supplement to fossil energy carriers such as oil and natural gas. Photocatalysis enables the direct conversion of solar power to hydrogen. In this work, the photocatalytic application of aqueous organic semiconductor dispersions is investigated for photocatalytic hydrogen generation. The nanoparticles comprise bulk-heterojunctions of donor/acceptor-materials and are synthesized by nanoprecipitation. Using colloidal particles warrants largest photoactive interfaces in the dispersion. To further maximize the photoactive interface, this work deliberately omits the use of surfactants for steric stabilization of the dispersion. Instead, for the first time, electrical dopants are used to charge the nanoparticles and thus to implement electrostatic repulsion of the nanoparticles. By attaching the co-catalyst platinum to the nanoparticle surface, the overpotential of the hydrogen evolution reaction is reduced. The result is an efficient generation of hydrogen. These aqueous dispersions exhibit great stability of more than 10 weeks on the shelf and are also stable during operation.
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