CsPbBr3nanocrystals supported on a partially oxidized Ti2N MXene for photothermal CO2conversion

Mego K.; Accardo E.; Ruiz-Campos P.; Baldoví H.G.; Atienzar P. · Materials Advances (2026) · DOI: 10.1039/d5ma01122a

Resumen

The development of new photo-thermal catalysts for the transformation of CO2 into fuels is of great interest, offering a clean and sustainable approach to reducing the carbon footprint. Herein, we present a novel hybrid material composed of a nanocrystalline metal halide perovskite (CsPbBr3) supported on a two-dimensional titanium nitride (Ti2N) MXene. Additionally, we demonstrate the importance of forming an external TiO2 layer through partial oxidation of the MXene (POM–Ti2N), which introduces catalytic centers and enhances photogenerated charge separation. Remarkable activity in the formation of CH4 and CO was observed, with yields of 321 µmol g−1 and 480 µmol g−1, respectively. The selectivity of the reaction was found to be temperature dependent. The mechanism was thoroughly investigated using XPS and photoluminescence studies. XPS analysis revealed a significant chemical interaction between the CsPbBr3 nanocrystals and the POM–Ti2N MXene after the formation of the composite. Photoluminescence measurements revealed a considerably shorter emission lifetime for the hybrid catalyst (τave = 1.73 ns) compared to that of the CsPbBr3 nanoparticles (τave = 25.32 ns), indicating strong interaction with the MXene. Furthermore, this research highlights the potential of combining metal halide perovskites with MXenes and the importance of controlling their interface for photo-thermal reactions. This journal is © The Royal Society of Chemistry, 2026

Instituciones: Universidad Científica del Sur