title: Photoinduced electron transfer pathways in hydrogen-evolving reduced graphene oxide-boosted hybrid nano-bio catalyst.
abstract: Photocatalytic production of clean hydrogen fuels using water and sunlight has attracted remarkable attention due to the increasing global energy demand. Natural and synthetic dyes can be utilized to sensitize semiconductors for solar energy transformation using visible light. In this study, reduced graphene oxide (rGO) and a membrane protein bacteriorhodopsin (bR) were employed as building modules to harness visible light by a Pt/TiO2 nanocatalyst. Introduction of the rGO boosts the nano-bio catalyst performance that results in hydrogen production rates of approximately 11.24 mmol of H2 (μmol protein)(-1) h(-1). Photoelectrochemical measurements show a 9-fold increase in photocurrent density when TiO2 electrodes were modified with rGO and bR. Electron paramagnetic resonance and transient absorption spectroscopy demonstrate an interfacial charge transfer from the photoexcited rGO to the semiconductor under visible light.
authors: Center for Nanoscale Materials and ‡Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors: Peng
authors: P
authors: Wang
authors: Nada M
authors: NM
authors: Dimitrijevic
authors: Angela Y
authors: AY
authors: Chang
authors: Richard D
authors: RD
authors: Schaller
authors: Yuzi
authors: Y
authors: Liu
authors: Tijana
authors: T
authors: Rajh
authors: Elena A
authors: EA
authors: Rozhkova
mesh_terms: D001436:Bacteriorhodopsins / Q000737:chemistry; D002384:Catalysis; D004579:Electron Transport; D006108:Graphite / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D008027:Light; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D010984:Platinum / Q000737:chemistry; D014025:Titanium / Q000737:chemistry
chemical_list: D010087:Oxides; C009495:titanium dioxide; D010984:Platinum; D001436:Bacteriorhodopsins; D006108:Graphite; D006859:Hydrogen; D014025:Titanium