article · Nature Communications
Developing organic polymer photocatalysts that produce hydrogen efficiently under visible and near-infrared light is challenging because narrowing the bandgap usually accelerates charge recombination. A new series of polymer nanoparticles based on ITIC and BTIC units addresses this problem by varying the linkers between acceptor-donor-acceptor repeating units. These materials operate as standalone photocatalysts for hydrogen evolution without requiring hybridisation or combination with other substances. Introducing a difluorothiophene linker facilitates charge transfer across the acceptors of adjacent units, significantly improving charge separation. Consequently, the resulting PITIC-ThF nanoparticles achieve high hydrogen evolution rates of 279 micromoles per hour under visible light and 20.5 micromoles per hour under near-infrared light. The material also displays an apparent quantum yield of 4.76 percent at a wavelength of 700 nanometres.
Most solar energy reaching the Earth falls within the visible and near-infrared spectrums, but conventional materials struggle to harness these wavelengths efficiently for fuel production due to rapid energy loss. Demonstrating that structural adjustments to standalone organic polymers can prevent charge recombination expands the potential to generate clean hydrogen directly from broader segments of sunlight without relying on complex composite systems.
The abstract describes early-stage laboratory research into solar-driven hydrogen evolution. This approach could eventually interest clean fuel producers and industrial catalyst manufacturers looking for single-component materials that capture broader solar spectra. However, the work remains at an experimental stage, with the abstract providing no evidence regarding catalyst durability, manufacturing scalability, or integration into commercial hydrogen generation equipment.
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Designing an organic polymer photocatalyst for efficient hydrogen evolution with visible and near-infrared (NIR) light activity is still a major challenge. Unlike the common behavior of gradually increasing the charge recombination while shrinking the bandgap, we present here a series of polymer nanoparticles (Pdots) based on ITIC and BTIC units with different π-linkers between the acceptor-donor-acceptor (A-D-A) repeated moieties of the polymer. These polymers act as an efficient single polymer photocatalyst for H2 evolution under both visible and NIR light, without combining or hybridizing with other materials. Importantly, the difluorothiophene (ThF) π-linker facilitates the charge transfer between acceptors of different repeated moieties (A-D-A-(π-Linker)-A-D-A), leading to the enhancement of charge separation between D and A. As a result, the PITIC-ThF Pdots exhibit superior hydrogen evolution rates of 279 µmol/h and 20.5 µmol/h with visible (>420 nm) and NIR (>780 nm) light irradiation, respectively. Furthermore, PITIC-ThF Pdots exhibit a promising apparent quantum yield (AQY) at 700 nm (4.76%).
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DOI: 10.1038/s41467-024-45085-6
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