title: Photodeposition of copper and chromia on gallium oxide: the role of co-catalysts in photocatalytic water splitting.
abstract: Split second: The photocatalytic activity of gallium oxide (β-Ga2 O3) depends strongly on the co-catalysts CuOx and chromia, which can be efficiently deposited in a stepwise manner by photoreduction of Cu(2+) and CrO4 (2-). The water-splitting activity can be tuned by varying the Cu loading in the range 0.025-1.5 wt %, whereas the Cr loading is not affecting the rate as long as small amounts (such as 0.05 wt %) are present. Chromia is identified as highly efficient co-catalyst in the presence of CuOx : it is essential for the oxidation of water.
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany), Fax: (+49) 0234-32-14115.
authors.forename: G Wilma
authors.initials: GW
authors.lastname: Busser
authors.forename: Bastian
authors.initials: B
authors.lastname: Mei
authors.forename: Anna
authors.initials: A
authors.lastname: Pougin
authors.forename: Jennifer
authors.initials: J
authors.lastname: Strunk
authors.forename: Ramona
authors.initials: R
authors.lastname: Gutkowski
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schuhmann
authors.forename: Marc-Georg
authors.initials: MG
authors.lastname: Willinger
authors.forename: Robert
authors.initials: R
authors.lastname: Schlögl
authors.forename: Martin
authors.initials: M
authors.lastname: Muhler
mesh_terms: D002384:Catalysis; D002857:Chromium / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D005708:Gallium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D055668:Photochemical Processes; D014867:Water / Q000737:chemistry*
chemical_list: D010087:Oxides; D014867:Water; D002857:Chromium; C038863:gallium oxide; D003300:Copper; D005708:Gallium
keywords: chromia; heterogeneous catalysis; photocatalysis; photodeposition; water splitting