Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.158
Publication date: 18th December 2023
To fight against climate change, the production of carbon-neutral energy is critical. Among the solar fuels, hydrogen stands out, allowing the storage of the sun’s energy as chemical bonds, by the photoreduction of protons. Pinaud et al. [1] have shown that using particle slurries can be a competitive and green way to produce hydrogen (Fig. 1).
Figure 1 Scheme of the cycle of Photocatalytic Hydrogen Generation, from the harvesting of the photons to the use of the solar fuel
In 2016 Tian et al.[2] managed to produce hydrogen using organic semiconductor nanoparticles. A hydrogen evolution rate (HER) of 8 mmol.h-1.g-1 was achieved and showed how the surfactant is essential to increase the catalytic activity, by creating pdots.[2] Moreover, the surfactant’s charge can potentially increase the surface photon affinity and the surfactant itself can lead to nanoparticles with a more suitable morphology, as demonstrated by Kosco et al.[3]: by changing the surfactant from SDS to TEBS, the morphology of the nanoparticles shifted from core-shell to intermixed, which resulted in a higher HER. It appears clear that it is fundamental to understand the role of the surfactant, in order to find the best one to increase the hydrogen evolution rate.
In this communication, it will be discussed how changing the surfactant used for nanoparticle stability affects the HER. A first study on the system P3HT:PC61BM was conducted, as a reference, with nanoparticles prepared via nanoprecipitation. For instance, a Janus morphology was recently reported for this system, which can be of great interest in the case of photocatalytic applications.[4]. From this, a state-of-the-art donor:acceptor couple will be introduced, with a promising HER of 13 mmol.h-1.g-1. To characterize the particles before and after the hydrogen evolution Dynamic Light Scattering, Cryo-TEM, and UV-Visible spectroscopy were used.
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