Titanium-Perovskite-Supported RuO2 Nanoparticles for Photocatalytic CO2 Methanation

Abstract

RuO2 nanoparticles supported on strontium titanate (STO) have demonstrated outstanding photothermal activity for CO2 methanation operating at 150°C under simulated sunlight irradiation. The photoresponse of the material is mainly due to UV photons, although RuO2/STO still retains about 50% efficiency under visible light irradiation (>400 nm). Mechanistic studies are compatible with a photothermal process with minor contribution of photocatalytic electron/hole charge separation. This value ranks the material among the most efficient methanation photocatalysts.