Preparation of Heterojunctions Based on Cs<sub>3</sub>Bi<sub>2</sub>Br<sub>9</sub> Nanocrystals and g-C<sub>3</sub>N<sub>4</sub> Nanosheets for Photocatalytic Hydrogen Evolution
María Medina-Llamas,
Andrea Speltini,
Antonella Profumo,
Francesca Panzarea,
Antonella Milella,
Francesco Fracassi,
Andrea Listorti,
Lorenzo Malavasi
Affiliations
María Medina-Llamas
Unidad Académica Preparatoria, Plantel II, Universidad Autónoma de Zacatecas, Zacatecas 98068, Mexico
Andrea Speltini
Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Antonella Profumo
Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Francesca Panzarea
Department of Chemistry, University of Bari “Aldo Moro” via Orabona 4, 70126 Bari, Italy
Antonella Milella
Department of Chemistry, University of Bari “Aldo Moro” via Orabona 4, 70126 Bari, Italy
Francesco Fracassi
Department of Chemistry, University of Bari “Aldo Moro” via Orabona 4, 70126 Bari, Italy
Andrea Listorti
Department of Chemistry, University of Bari “Aldo Moro” via Orabona 4, 70126 Bari, Italy
Lorenzo Malavasi
Department of Chemistry, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
Heterojunctions based on metal halide perovskites (MHPs) are promising systems for the photocatalytic hydrogen evolution reaction (HER). In this work, we coupled Cs3Bi2Br9 nanocrystals (NCs), obtained by wet ball milling synthesis, with g-C3N4 nanosheets (NSs), produced by thermal oxidation of bulk g-C3N4, in air. These methods are reproducible, inexpensive and easy to scale up. Heterojunctions with different loadings of Cs3Bi2Br9 NCs were fully characterised and tested for the HER. A relevant improvement of H2 production with respect to pristine carbon nitride was achieved at low NCs levels reaching values up to about 4600 µmol g−1 h−1. This work aims to provide insights into the synthesis of inexpensive and high-performing heterojunctions using MHP for photocatalytic applications.
