Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 61: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides I (joint session DS/MM/O)

O 61.4: Vortrag

Mittwoch, 20. März 2024, 16:15–16:30, A 053

synthesis and characterization of 2D Mo/Ti solid solutions based MXene for hydrogen evolution reaction in alkaline media. — Lola Loupias¹, Claudia Morais¹, Sophie Morisset¹, Christine Canaff¹, Zheming Li¹, Patrick Chartier², Vincent Mauchamp², Thierry Cabioc'h², Aurélien Habrioux¹, and •Stéphane Célérier¹ — ¹Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, CNRS, F-86073 Poitiers, France — ²Institut Pprime, UPR 3346 CNRS, Université de Poitiers, ISAE-ENSMA, BP 30179, 86962 Futuroscope-Chasseneuil Cedex, France

2D MXenes have gained an ever-increasing attention in various application fields. Their properties can be strongly tuned by modifying the M element in the Mn+1XnTx structure. Among them, Mo-based MXenes are beginning to be successfully explored in many areas. This work focuses on the synthesis and characterization of (Mo,Ti)n+1CnTx MXenes to understand their complex chemistry and to compare them with those of mono-metallic Mo2CTx and Ti3C2Tx. The potential of these materials as HER (hydrogen evolution reaction) catalysts is determined in alkaline medium. It is shown that Mo2Ti2C3Tx MXenes are a credible alternative to Mo2CTx MXenes since the surface properties of both MXenes are similar while their composition is quite different. Indeed, (Mo,Ti)n+1CnTx require lower temperatures and shorter time for the synthesis than for Mo2CTx, a great advantage from an industrial point of view. Finally, some avenues for improving the performance of MXenes for HER will also be described.

Keywords: MXene; (Mo,Ti)n+1CnTx; surface chemistry; surface properties; hydrogen evolution reaction