Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.198
Publication date: 11th July 2022
Photocatalytic solar fuel production provides a potential alternative to sustainable energy production. Whilst attention to date has focused on inorganic photocatalysts, carbon-based materials and organic semiconductors have emerged as potential low cost and efficient photocatalyst for hydrogen evolution, mainly due to the tunability of their properties through synthetic control.[1,2] This allow the design of families of materials with tuned opto-electronic properties by incorporating different building blocks.[1] The best performing systems are bulk heterojunctions nanoparticles prepared from a blend of conjugated polymer donor and non-fullerene small molecules acceptor, particularly due to their improved light absorption in the visible range.[2,3] Despite the efficient performance of the donor/acceptor bulk heterojunction photocatalysts for hydrogen evolution, the fundamental understanding of the photophysical processes that determine their performance remain limited. In this presentation, I will discuss the charge carrier dynamics of donor/acceptor heterojunction nanoparticles photocatalysts with different hydrogen evolution activity.[2,3] Transient and operando photoinduced absorption spectroscopies, on timescales of femtoseconds to seconds after light absorption, were employed to monitor the kinetics of photogenerated charges and their correlation with photocatalytic performance.[3] Differences between the function of Donor/Acceptor bulk heterojunction photocatalysts and single conjugated polymers photocatalyst will be discussed. These results can provide design guidelines towards efficient organic semiconductors photocatalyst.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement no. 886664.
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