Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.287
Publication date: 18th July 2023
Organic semiconductors heterojunctions have recently gained significant interest in solar fuel production. In contrast to widely studied inorganic photocatalysts, the synthetic tunability of organic semiconductors, such as conjugated polymers and covalent organic framework (COF), allows the design of materials with tuned bandgaps for photocatalysts that can absorb a wider proportion of solar spectrum. Recently, heterojunctions nanoparticles prepared from a blend of conjugated polymer and non-fullerene small molecules, as those used in the organic photovoltaic field, have shown promising efficiency for hydrogen production in the visible. [1,2] Our previous transient and operando studies have shown remarkably long-lived charge generation within the donor:acceptor heterojunction nanoparticles on timescales useful for photocatalysis (microsecond-millisecond).[3] Using a similar approach, 2D templated polymer heterojunctions were explored as a photocatalyst for hydrogen production, prepared by combining donor and acceptor 2D polymers in a templated growth method. Transient absorption spectroscopy on timescales ranging from picoseconds to seconds were employed to monitor the kinetics of photogenerated charges in the 2D heterojunction and single 2D polymer components and their correlation with hydrogen production.[4] In this talk, the charge carrier dynamics of the novel 2D templated polymer photocatalyst with improved hydrogen evolution rates will be discussed, including the effect of charge trapping and metal cocatalyst on charge extraction.
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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