Bifunctional photocatalysts based on transition metal sulfides deposited on TiO2 for hydrogen evolution reaction

C. Maheu (1) , L. Cardenas (2) , P. Afanasiev (1) , C. Geantet (1) , E. Puzenat (1)

1 CATREN - IRCELYON-Catalyse Hétérogène pour la Transition Energétique
2 XPS - IRCELYON-Etudes & analyse de surfaces, XPS, LEIS

Transition metal sulfides (TMS) deposited on TiO2 are studied for the photocatalytic production of hydrogen. The aim is to investigate a correlation between the activity of the TMS-based photocatalyst and their intrinsic properties: sulfide phase, surface properties. And electronic structure. Eight catalysts were prepared using a solution deposition method. They were characterized by X-ray diffraction, temperature programmed reduction, microscopy and X-ray photoelectron spectroscopy. The later permits a preliminary investigation of the valence band and UV-visible absorption gives information on the band gap of the materials. Photocatalytic activity was measured for the dehydrogenation of the propan-2-ol in hydrogen. Hydrogen production rate leads to the quantum efficiency of the reaction. An apparent activation energy is also measured. RuS2/TiO2 has the best activity. Mass and loading optimization were then conducted on this photocatalyst. Its stability was also studied.

Domaines: Catalyse; Environnement et Société

C. Maheu, L. Cardenas, P. Afanasiev, C. Geantet, E. Puzenat. Bifunctional photocatalysts based on transition metal sulfides deposited on TiO2 for hydrogen evolution reaction. 28th International Conference on Photochemistry (ICP 2017), Jul 2017, Strasbourg, France. ⟨hal-01586600⟩