Photocatalytic activity of Cu2O/TiO2, Bi2O3/TiO2 and ZnMn2O4/TiO2 heterojunctions

Ohmic Hetero-Junction of n-Type Silicon and Tungsten Trioxide for Visible-Light Sensitive Photocatalyst

“…Another common method is to produce or find photocatalysts with narrow band-gaps which can absorb visible light [6] [7] [8] [9]. From these studies, combined systems consisting of two such narrow band-gap photocatalysts (PC1/ PC2) have been devepoled, such as tungsten disulfide (WS 2 )/tungsten trioxide (WO 3 ), cobalt oxide (Co 3 O 4 )/bismuth vanadate (BiVO 4 ), and so on (Type I in scheme 1) [10] [11] after the suggestions made in the literatures as to the more efficient charge separation in the combined system of TiO 2 and cadmium sulfide (CdS), iron oxide (Fe 2 O 3 ), WO 3 , ZnO, cupper oxide (Cu 2 O), or bismuth oxide (Bi 2 O 3 ) etc., resulting in the increase in the lifetime of the charge carriers and the enhancement of the activity [12] [13]. However, all these combined systems are not recommended from the viewpoint of oxidation and reduction potentials of holes and electrons, respectively, after their interparticle transfer because the oxidation power of the holes and reduction powers of the electrons become weak after the transfer (Type I in Scheme 1).…”

Photoelectrocatalytic degradation of organic contaminants at Bi2O3/TiO2 nanotube array electrode

“…One of the approaches is coupling TiO 2 with other semiconductor with appropriate band gaps. A large number of coupled polycrystalline or colloidal semiconductor, in which the particles adhere to each other in so-called sandwich structures or present a core-shell geometry, have been prepared such as SiO 2 [4][5][6][7] were reported to be efficient under visible light irradiation. However, the photocatalytic mechanism for the coupled system has not been systematically investigated, and no clear evidence was provided for the complete decomposition of organic pollutants under visible light.…”

In situ loading of Cu2O nanoparticles on a hydroxyl group rich TiO2 precursor as an excellent catalyst for the Ullmann reaction

“…In addition, in several cases, the strong synergistic interaction between nanoparticles and solid supports can greatly enhance the catalytic activity and selectivity [6,7]. Recently, Cu 2 O has attracted great research interest by virtue of its applications in solar energy conversion and catalysis [8][9][10][11]. For example, Kim et al synthesized thermally and air stable Cu 2 O nanocubes and used them to catalyze cross coupling of aryl halides with phenols via Ullmann coupling [12].…”