Publication date: 21st July 2025
Perovskite and organic photoactive materials, owing to their exceptional optoelectronic properties, are regarded as highly promising candidates for integration into photoelectrochemical systems aimed at green hydrogen generation via solar water splitting. These photoactive material classes have attracted substantial research interest, having achieved record-high power conversion efficiencies in single-junction photovoltaic devices. Nonetheless, their application in photoelectrodes remains constrained by intrinsic instability under aqueous conditions.
A cost-effective encapsulation methodology for halide perovskite and organic photoactive layers will be presented, which enabled both prolonged operational stability (>100 hours) and high photocurrent densities for water oxidation (>8 mA cm‑2 and >25 mA cm‑2 at 1.23 VRHE, respectively).
In solar water splitting, significant energy loss arises due to the high overpotential associated with the oxygen evolution reaction, which results in the production of a low-value product: oxygen. Our recent efforts have focused on coupling perovskite-based photoelectrodes with alternative oxidation reactions to enhance system efficiency and product value. Our findings will be presented on the use of perovskite photoelectrodes for simultaneous hydrogen generation and the oxidation of glycerol to value-added products. By employing absorber materials with optimized optical bandgaps (~1.6 eV) in conjunction with a Au–Pt–Bi electrocatalyst, bias-free operation was achieved, yielding photocurrent densities exceeding 10 mA cm⁻² and operational stability beyond one hour. Necessary steps to achieve longer stability and increased product selectivity will be also discussed.
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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