Spatial separation of oxidation and reduction co-catalysts for efficient charge separation: Pt@TiO₂@MnO _x hollow spheres for photocatalytic reactions.

ABSTRACT: Efficient charge separation is a critical factor for solar energy conversion by heterogeneous photocatalysts. This paper describes the complete spatial separation of oxidation and reduction cocatalysts to enhance the efficacy of charge separation and surface reaction. Specifically, we design Pt@TiO₂@MnO _x hollow spheres (PTM-HSs) with Pt and MnO _x loaded onto the inner and outer surface of TiO₂ shells, respectively. Pt favours electron trapping, while MnO _x tends to collect holes. Upon generation from TiO₂, electrons and holes flow inward and outward of the spherical photocatalyst, accumulating on the corresponding cocatalysts, and then take part in redox reactions. Combined with other advantages, such as the large surface area and appropriate pore size, the PTM-HSs exhibit high efficiency for the photocatalytic oxidation of water and benzyl alcohol. The mechanism of the oxidation process of benzyl alcohol over the photocatalyst is also presented.

SUBMITTER: Li A 

PROVIDER: S-EPMC5530359 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature