Superiority and mechanism of Pt oriented-deposition in improving the photocatalytic activity of TiO₂ sphere with exposed {0 0 1} facet

Transfer and aggregation of photogenerated electrons and holes on anatase TiO₂ sphere with wholly exposed {0 0 1} facets are investigated by Pt oriented-deposition. Results indicate the Pt particles are all deposited on the edge, which is served for photo-reduction, between the {0 0 1} and {1 0 1} facets. The {0 0 1} facets will serve for photo-oxidation. This structure is superior to that of Pt random-deposition, resulting in higher efficiency in separating photogenerated electrons and holes. Proper amount of deposited Pt is also an important factor in affecting the photocatalytic activity of TiO₂. Photocatalytic degradation of RhB and phenol suggest the as-prepared photocatalysts can be efficient candidates for decomposing organic pollutants.