Change of MoS2 phase nature: Effect of molybdenum introduction path in TiO2 nanotubes

• Published in: Catalysis today Vol. 431; p. 114555
• Main Authors: Ben Neon, Limor, Blanchard, Pascal, Dubau, Laetitia, Maugé, Françoise, Oliviero, Laetitia
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2024; Elsevier
• Subjects: 1 T-MoS2 phase; Chemical Sciences; Edge site concentration; Exposed TiO2 facets; IR/CO characterization; Sulfide catalysts; 1 T-MoS2 phase; Sulfide catalysts; Exposed TiO2 facets; Edge site concentration; IR/CO characterization
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2024.114555

The chalcogenide MoS2 has three polymorphs: 2 H; 3 R; 1 T. Each of them is endowed with interesting properties and characteristics which make them promising materials for photo- and electrocatalysis, photodevices and electronics. In this work, we demonstrate the impact of the chosen synthesis path in which molybdenum precursor is introduced on the formation of MoS2 on TiO2 nanotubes (TiNT) using FTIR spectroscopy. Thus,for the first time 1 T-MoS2 was obtained under H2S/H2 flow by incorporating Mo into the nanotube wall which might be an interesting approach for industrial scaling-up procedures. Moreover, unprecedently we report the possible detection of 1 T-MoS2 via IR-transmission using CO as a probe molecule. [Display omitted] •TiO2 nanotubes (TiNT) expose anatase (001) facets as revealed by IR/CO.•The way Mo is introduced on TiNT has an impact of MoS2 phase nature and its properties.•Mo impregnation on TiNT allows to increase the electron density of Mo but leads to clogged pores.•Mo embedded in TiO2 nanotubes leads to 1 T/2 H-MoS2 formation under H2S/H2 flow.•In both cases TiNT favors the formation of sulfur vacancies on M-edges.