Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.114
Publication date: 11th July 2022
Halide perovskite materials have attracted great scientific interest due to their solution-processability and excellent optoelectronic properties. Applying these perovskites photoactive layers for direct solar water splitting has the potential to provide efficient and inexpensive photoelectrodes for solar hydrogen generation. In this presentation all-inorganic CsPbBr3 perovskite (2.3 eV bandgap) photoelectrodes will be presented, where the photoactive layer is protected from direct contact with the aqueous electrolyte by a graphite sheet and a low-temperature printed carbon layer. The critical role of controlling 2-dimensional (CsPb2Br5) and 0-dimensional (Cs4PbBr6) perovskite phase formation and their effect on stability and efficiency will be discussed. The low annealing temperature carbon layer enables the deposition of an organic hole transport layer, while the graphite sheet allows for electrodeposition of nanoscale NiFeOOH co-catalyst on its surface. It will be shown that all these developments lead to all-inorganic halide perovskite photoanodes with remarkable days-long stability and photocurrent generation (~10 mA cm-2) close to the theoretical efficiency limit of CsPbBr3. Finally, the potential for scaling up these devices will be demonstrated by presenting photoanodes with an area above 1 cm2.
Financial support from EPSRC (grant EP/S030727/1) is greatly acknowledged.
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