Visible-light-active Rh-doped SrTiO3: Effect of Rh doping on the structural characteristics contributing to outstanding photocatalytic activity

Gyulavári, Tamás and Bóka, Fanni and Todea, Milica and Ágoston, Áron and Kukovecz, Ákos and Kónya, Zoltán and Pap, Zsolt (2025) Visible-light-active Rh-doped SrTiO3: Effect of Rh doping on the structural characteristics contributing to outstanding photocatalytic activity. CATALYSIS TODAY, 447. ISSN 0920-5861

Preview

Text Gyulavari_Tamas_Catal_Today_2025.pdf - Published Version Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (1MB) | Preview

Abstract

Strontium titanate photocatalysts were doped with rhodium (0, 1, 5, 10, and 15 at%) via a hydrothermal method to enhance their visible light absorbance. The samples were characterized by X-ray diffractometry, X-ray photoelectron spectroscopy, infrared spectroscopy, nitrogen adsorption, scanning and transmission electron microscopy, diffuse reflectance spectroscopy, and photoluminescence measurements. Their photocatalytic activity was evaluated by the photocatalytic oxidation of phenol under visible light irradiation, using the non-Rhcontaining sample as a reference. All the applied rhodium was successfully incorporated into the cubic crystal lattice. Rhodium doping resulted in significantly enhanced visible light absorption and suppressed charge recombination. The photocatalytic activity was enhanced to an exceptionally large degree: the best sample completely degraded phenol in 1 h under visible light. The optimal rhodium amount was found to be 5 at%. The high photocatalytic activity was attributed to the resultant effect of enhanced visible light absorbance, suppressed charge recombination, and high Rh3+/Rh4+ ratio.

Actions (login required)

Edit Item