Visible light driven reduction of carbon dioxide with water on modified Sr3Ti2O7 catalysts

Abstract

Layered perovskite type Sr₃Ti₂O₇ catalysts, doped with N, S and Fe have been prepared by modified polymer complex method, characterized and evaluated for photo reduction of CO₂ in aqueous alkaline medium using UV-visible radiation. EDXA and XRD data reveal the incorporation of the dopants into the titanate matrix. The presence of N in substitutional and interstitial locations, S as S⁶⁺ and Fe as Fe³⁺ species are indicated by XPS analysis. DRS and photo luminescence studies show that the dopants form additional energy levels within the band gap, promoting visible light absorption and retarding recombination of the charge carriers. Morphological changes and smaller crystallites also minimize recombination. Layered structure of Sr₃Ti₂O₇ facilitates easy transport of charge carriers and separation of oxidation/reduction reaction centres. Structural, morphological and photo physical characteristics of doped catalysts improve the activity significantly. Sr₃Ti₂O₇ co-doped with N, S and Fe together, displays maximum apparent quantum yield for CO₂ reduction products.