Publication date: 28th August 2024
Perovskite and organic photoactive materials due to their excellent optoelectronic properties have great potential to be used in photoelectrochemical devices for green hydrogen generation via solar water splitting. These two types of materials have attracted great scientific interest by reaching record high single-junction solar cell efficiencies, but their photoelectrode performance is currently limited by their instability in an aqueous environment.
We will present a cost-effective way of protecting halide perovskite and organic photoactive layers used to reach both stable (>100 hours) and remarkably high, water oxidation photocurrents (>8 mA cm‑2 and >25 mA cm‑2 at 1.23 VRHE, respectively).[1-3] We will also show monolithic organic tandem photoanodes with exceptionally low, negative onset potential and bias-free water splitting in two-electrode setup with solar-to-hydrogen efficiency reaching up to 5%. [3]
However, in solar water-splitting, due to the high overpotential of water oxidation a significant amount of energy is lost producing a low market value product (oxygen). In this presentation, we will show our most recent results on how we can apply graphite sheet protected organic and perovskite photoelectrodes to achieve simultaneous production of solar hydrogen and a value-added product from glycerol. We will show that the carefully chosen energetics of the perovskite and organic photoactive materials (optical bandgaps of 1.6 and 1.5 eV, respectively) combined with a developed Au–Pt–Bi electrocatalyst allows us to reach both bias-free operation and photocurrents close to the theoretical limit of the materials.
Funded by the European Union under the Marie Skłodowska-Curie grant agreement No 101103762. S.E. and M.D. acknowledge the funding of UK Engineering and Physical Sciences Research Council (EPSRC) provided via grant EP/S030727/1. F. E. and J. N. acknowledge financial support from the European Research Council (action no. 742708).
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