Experimental Strategy to Enache the Photocatalytic Activity of Cs2AgBiCl6 Lead-free Double Perovskite Derivative by g-C3N4 Composite Engineering the Size Grain from Bulk to Nanometer Dimension.

Costanza Tedesco^a, Lorenzo Malavasi^a, Andrea Speltini^a

^aUniversity of Pavia, Italy, Via Taramelli 16, Pavia, 27100, Italy

Materials for Sustainable Development Conference (MATSUS)
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)

#PbFreePero - The potential of lead-free perovskites: synthesis, properties, and applications

Barcelona, Spain, 2022 October 24th - 28th

Organizers: Loreta Muscarella, Eline Hutter and Hendrik Bolink

Poster, Costanza Tedesco, 301
Publication date: 11th July 2022

The implementation of heterojunction based on metal halide perovskite (MHPs) is a promising route to obtaining innovative photocatalysts to run relevant solar-driven reactions. However, the toxicity of lead, present in the most studied perovskites and, chemical instability issues prevent the lead halide perovskites from wide practical application. Replacing two Pb2+ (2Pb2+ → M+ + M3+) with one monovalent ion (M+ = Au+, Ag+, Cu+) and one trivalent ion (M3+ = Bi3+, In3+, Sb3+) represents a simple strategy for the synthesis of lead-free perovskites that are stable in the air and moisture atmosphere. Among the alternatives, Cs2AgBiCl6 has been widely investigated thanks to its suitable band-gap and stability against heat and moisture. In this work, an experimental study on the synergic coupling between Cs2AgBiCl6 derivative and g-C3N4 is presented. Three composite systems with different grain sizes have been tested to relate the grain size and the surface air of the photocatalyst composite with the photocatalytic performance of the system. An interesting boost of the hydrogen photogeneration is recorded in isopropanol aqueous solution (10% w/w) when going from bulk g-C3N4 (696 HER) to NC Cs2AgBiCl6/nanosheet g-C3N4 system (2109 HER). The simple heat air treatment to obtain g-C3N4 nanosheets and the ease with which nanocrystals Cs2AgBiCl6 are formed with the LARP method indicate Cs2AgBiCl6/g-C3N4-based materials as promising candidates for photocatalytic hydrogen evolution application.

References:

[1] Jiang, Y. et al. In Situ Synthesis of Lead-Free Halide Perovskite Cs2AgBiBr6Supported on Nitrogen-Doped Carbon for Efficient Hydrogen Evolution in Aqueous HBr Solution. ACS Appl Mater Interfaces 13, 10037–10046 (2021).

[2] Armenise, V., Colella, S., Fracassi, F. & Listorti, A. Lead-free metal halide perovskites for hydrogen evolution from aqueous solutions. Nanomaterials vol. 11 1–23 Preprint at

[3] Romani, L. & Malavasi, L. Solar-Driven Hydrogen Generation by Metal Halide Perovskites: Materials, Approaches, and Mechanistic View. ACS Omega vol. 5 25511–25519 Preprint at

[4] Romani, L. et al. Experimental Strategy and Mechanistic View to Boost the Photocatalytic Activity of Cs3Bi2Br9 Lead-Free Perovskite Derivative by g-C3N4 Composite Engineering. Adv Funct Mater 31, (2021).

[5] Pisanu, A. et al. Enhanced hydrogen photogeneration by bulk g-C3N4 through a simple and efficient oxidation route. Dalton Transactions 47, 6772–6778 (2018).

Acknowledgements:

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