title: Photocatalytic water oxidation by a pyrochlore oxide upon irradiation with visible light: rhodium substitution into yttrium titanate.
abstract: A stable visible-light-driven photocatalyst (λ≥450 nm) for water oxidation is reported. Rhodium substitution into the pyrochlore Y2 Ti2 O7 is demonstrated by monitoring Vegard's law evolution of the unit-cell parameters with changing rhodium content, to a maximum content of 3 % dopant. Substitution renders the solid solutions visible-light active. The overall rate of oxygen evolution is comparable to WO3 but with superior light-harvesting and surface-area-normalized turnover rates, making Y2 Ti1.94 Rh0.06 O7 an excellent candidate for use in a Z-scheme water-splitting system.
authors.affiliation: Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD (UK).
authors.forename: Borbala
authors.initials: B
authors.lastname: Kiss
authors.forename: Christophe
authors.initials: C
authors.lastname: Didier
authors.forename: Timothy
authors.initials: T
authors.lastname: Johnson
authors.forename: Troy D
authors.initials: TD
authors.lastname: Manning
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Dyer
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Cowan
authors.forename: John B
authors.initials: JB
authors.lastname: Claridge
authors.forename: James R
authors.initials: JR
authors.lastname: Darwent
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Rosseinsky
keywords: photocatalysis; pyrochlore; rhodium; titanates; water splitting