Heterostructured Visible-Light-Active Photocatalyst of Chromia-Nanoparticle-Layered Titanate

Authors


  • This work was performed for the Hydrogen Energy R&D Center, one of the 21st Century Frontier R&D Program, funded by the Ministry of Science and Technology of Korea. The experiments at Pohang Light Source (PLS) were supported in part by MOST and POSTECH. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

An efficient visible-light active photocatalyst of porous CrOx–Ti1.83O4 nanohybrid with a 1:1 type ordered heterostructure is synthesized through a hybridization between a chromia cluster and exfoliated titanate nanosheets. The present nanohybrids are found to have a large surface area (ca. 250–310 m2 g–1) and an intense absorption of visible light, ascribable, respectively, to the formation of a porous structure and the hybridization of titanate with narrow-bandgap chromium oxide. After the calcination at 400 °C, the nanohybrid shows an enhanced photocatalytic activity to effectively decompose organic compounds under the irradiation of visible light (λ > 420 nm). The present study highlights the exfoliation–restacking route as a very powerful way to develop efficient visible-light-harvesting photocatalysts with excellent thermal stability.

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