Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.130
Publication date: 18th July 2023
Photoelectrochemical water splitting is a promising way of solar hydrogen generation. However, in order to achieve inexpensive, efficient, and stable photoelectrodes significant further improvements are needed. Perovskite and organic photoactive 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. In this presentation, we will show a cost-effective way of protecting halide perovskite, as well as organic photoactive layers used for solar water splitting to reach both stable (>100 hours) and remarkably high photocurrents (>8 mA cm‑2 and >25 mA cm‑2 at 1.23 VRHE, respectively). The perovskite photoelectrodes were developed using a low annealing temperature carbon paste with tuned energy level CsPbBr3 photoactive layer. The effect of 2-dimensional (CsPb2Br5) and 0-dimensional (Cs4PbBr6) perovskite phases on efficiency and stability will be discussed including ways to control their formation. The organic photoanodes applied a ternary bulk heterojunction blend (non-fullerene acceptor and polymer donor) and the interlayers were optimised for stability under 1 sun illumination. Importantly, the lifetime of the photoelectrodes was increased by applying a protective graphite sheet functionalised with electrodeposited oxygen evolution catalyst (NiFeOOH), allowing to reach remarkable stability of several days – instead of the often-reported few hours – at high photocurrent densities, far beyond the current state-of-the art levels.
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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