title: Light Induced H2 Evolution from a Biophotocathode Based on Photosystem 1--Pt Nanoparticles Complexes Integrated in Solvated Redox Polymers Films.
abstract: We report on a biophotocathode based on photosystem 1 (PS1)-Pt nanoparticle complexes integrated in a redox hydrogel for photoelectrocatalytic H2 evolution at low overpotential. A poly(vinyl)imidazole Os(bispyridine)2Cl polymer serves as conducting matrix to shuttle the electrons from the electrode to the PS1-Pt complexes embedded within the hydrogel. Light induced charge separation at the PS1-Pt complexes results in the generation of photocurrents (4.8 ± 0.4 μA cm(-2)) when the biophotocathodes are exposed to anaerobic buffer solutions. Under these conditions, the protons are the sole possible electron acceptors, suggesting that the photocurrent generation is associated with H2 evolution. Direct evidence for the latter process is provided by monitoring the H2 production with a Pt microelectrode in scanning electrochemical microscopy configuration over the redox hydrogel film containing the PS1-Pt complexes under illumination.
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Zhao
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Felipe
authors.initials: F
authors.lastname: Conzuelo
authors.affiliation: Plant Biochemistry, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Volker
authors.initials: V
authors.lastname: Hartmann
authors.affiliation: Center for Electrochemical Sciences-Molecular Nanostructures, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Huaiguang
authors.initials: H
authors.lastname: Li
authors.affiliation: Plant Biochemistry, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Marc M
authors.initials: MM
authors.lastname: Nowaczyk
authors.affiliation: Center for Electrochemical Sciences-Molecular Nanostructures, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Plumeré
authors.affiliation: Plant Biochemistry, Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Rögner
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, 44780 Bochum, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schuhmann
mesh_terms: D004566:Electrodes; D004583:Electrons; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry / Q000378:metabolism; D006859:Hydrogen / Q000737:chemistry* / Q000378:metabolism*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry* / Q000378:metabolism; D010084:Oxidation-Reduction; D055668:Photochemical Processes / Q000528:radiation effects; D045331:Photosystem I Protein Complex / Q000737:chemistry* / Q000378:metabolism; D010984:Platinum / Q000737:chemistry* / Q000378:metabolism; D011108:Polymers / Q000737:chemistry* / Q000378:metabolism; D012995:Solubility
chemical_list: D009942:Organometallic Compounds; D045331:Photosystem I Protein Complex; D011108:Polymers; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D010984:Platinum; D006859:Hydrogen