Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.056
Publication date: 18th December 2023
Halide perovskites have gained wide interest for their application in photovoltaics, sensors, photocatalysis, and photoelectrochemistry, due to their excellent optoelectronic properties. However, their development in photoelectrochemistry for solar fuels and chemicals is hampered by their instability in aqueous environments. In this talk, I will present our recent progress in the protection of halide perovskite-based photoanodes with different sheets of carbon allotropes, namely mesoporous carbon, graphite, glassy carbon, and boron-doped diamond, decorated with electrocatalysts. The protection of a CsPbBr3 photoabsorber film with a mesoporous carbon layer results in photoanodes that last a few hours [1]. Addition of porous graphite sheets increases the stability from hours to days, especially with the addition of water-oxidation NiFeOOH electrocatalyst on the surface of the porous graphite sheet [2]. Longer stabilities of weeks can be achieved by creating porosity gradients with different graphite sheets and by replacing the top graphite sheet upon signs of deterioration. Finally, the best stabilities, projected to be of months, can be realized with more chemically and mechanically stable glassy carbon and boron-doped diamond sheets [3]. These achieve world-record stability: 97% of initial photocurrent close to 8 mA cm-2 is preserved for 210 h under harsh +1.23 V vs RHE of applied bias (stability projection = 10 months). All these carbon allotropes provide the halide perovskites with durable protection, efficient charge separation and transport, electrocatalyst support, and, importantly, photothermal properties for enhanced thermal management, which are invaluable additions for their future development and application of halide perovskite photoelectrochemical devices.
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