Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
A new way to think OPV was investigated few years ago, in which the active materials are no more solubilized in organic solvents, but dispersed as nanoparticles in a friendly solvent such as ethanol or water [1]. After few years of research and optimization, the very symbolic power conversion efficiency (PCE) of 10% was surpassed by Xie et al. in 2022, using diiodooctane as additive, showing the potential of aqueous dispersion-based devices [2]. Even though the gap between the performances of organic solvent-based and water-based devices decreases year after year, several parameters can be optimized to improve even more the efficiencies of water-based OPV. The nanoparticle internal morphology (linked to the preparation technique, i.e. nanoprecipitation or miniemulsion), the nanoparticle size, the use of friendly additives, or the influence of surfactant molecules (mandatory for dispersion stability) are under the scope of several research teams.
In 2016 Tian et al. managed to perform hydrogen evolution using the same kind of organic nanoparticles, reaching a hydrogen evolution rate (HER) of 8 mmol.h-1.g-1 and showing how the surfactant is essential to increase the catalytic activity, by creating small nanoparticles [3].
In this poster, we will present our recent results [4], on the elaboration of Janus nanoparticles but also on their incorporation as active layer for OPV and their use as Photocatalyst for hydrogen genenration.
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