title: Wafer-level photocatalytic water splitting on GaN nanowire arrays grown by molecular beam epitaxy.
abstract: We report on the achievement of wafer-level photocatalytic overall water splitting on GaN nanowires grown by molecular beam epitaxy with the incorporation of Rh/Cr(2)O(3) core-shell nanostructures acting as cocatalysts, through which H(2) evolution is promoted by the noble metal core (Rh) while the water forming back reaction over Rh is effectively prevented by the Cr(2)O(3) shell O(2) diffusion barrier. The decomposition of pure water into H(2) and O(2) by GaN nanowires is confirmed to be a highly stable photocatalytic process, with the turnover number per unit time well exceeding the value of any previously reported GaN powder samples.
authors.affiliation: Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec H3A 2A7, Canada.
authors.forename: Defa
authors.initials: D
authors.lastname: Wang
authors.forename: Adrien
authors.initials: A
authors.lastname: Pierre
authors.forename: Md Golam
authors.initials: MG
authors.lastname: Kibria
authors.forename: Kai
authors.initials: K
authors.lastname: Cui
authors.forename: Xueguang
authors.initials: X
authors.lastname: Han
authors.forename: Kirk H
authors.initials: KH
authors.lastname: Bevan
authors.forename: Hong
authors.initials: H
authors.lastname: Guo
authors.forename: Suzanne
authors.initials: S
authors.lastname: Paradis
authors.forename: Abou-Rachid
authors.initials: AR
authors.lastname: Hakima
authors.forename: Zetian
authors.initials: Z
authors.lastname: Mi
mesh_terms: D002384:Catalysis; D017608:Chromium Compounds / Q000737:chemistry; D004058:Diffusion; D005708:Gallium / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D053770:Nanowires / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D010777:Photochemistry; D012238:Rhodium / Q000737:chemistry; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D017608:Chromium Compounds; D014867:Water; C473348:gallium nitride; D006859:Hydrogen; D005708:Gallium; D012238:Rhodium; D010100:Oxygen; C023600:chromic oxide