title: Mo-doped BiVO4 photoanodes synthesized by reactive sputtering.
abstract: We report a scalable and reproducible method for reactive co-sputtering of Mo-doped BiVO4 thin films with broad compositional control. Optimal photoanode performance is achieved at a Mo concentration of 3 at. %. Incorporation of Mo promotes growth of large grains and reduces majority carrier transport limitations, resulting in maximum AM1.5G photocurrent densities of 3.5 mA cm(-2) at 1.23 V vs. RHE in pH 6.8 buffer solution containing 0.1 M Na2 SO3 as a hole scavenger. Operation as a front-illuminated water oxidation photoanode is achieved by balancing the operational stability, catalytic activity, and parasitic optical absorption of a FeOOH oxygen evolution catalyst. FeOOH/Mo:BiVO4 thin film photoanodes enable water oxidation under the front-side illumination conditions used in integrated tandem water splitting devices.
authors.affiliation: Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States).
authors.forename: Le
authors.initials: L
authors.lastname: Chen
authors.forename: Francesca M
authors.initials: FM
authors.lastname: Toma
authors.forename: Jason K
authors.initials: JK
authors.lastname: Cooper
authors.forename: Alan
authors.initials: A
authors.lastname: Lyon
authors.forename: Yongjing
authors.initials: Y
authors.lastname: Lin
authors.forename: Ian D
authors.initials: ID
authors.lastname: Sharp
authors.forename: Joel W
authors.initials: JW
authors.lastname: Ager
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D005290:Ferric Compounds / Q000737:chemistry; D008982:Molybdenum / Q000737:chemistry*; D055620:Optical Phenomena; D012993:Solar Energy; D014638:Vanadates / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; C091754:bismuth vanadium tetraoxide; C000499:ferric oxide; D014638:Vanadates; D008982:Molybdenum; D001729:Bismuth
keywords: artificial photosynthesis; semiconductors; thin films; water oxidation; water splitting