title: Photoelectrochemical H2Evolution with a Hydrogenase Immobilized on a TiO2-Protected Silicon Electrode.
abstract: The combination of enzymes with semiconductors enables the photoelectrochemical characterization of electron-transfer processes at highly active and well-defined catalytic sites on a light-harvesting electrode surface. Herein, we report the integration of a hydrogenase on a TiO2-coated p-Si photocathode for the photo-reduction of protons to H2. The immobilized hydrogenase exhibits activity on Si attributable to a bifunctional TiO2layer, which protects the Si electrode from oxidation and acts as a biocompatible support layer for the productive adsorption of the enzyme. The p-Si|TiO2|hydrogenase photocathode displays visible-light driven production of H2at an energy-storing, positive electrochemical potential and an essentially quantitative faradaic efficiency. We have thus established a widely applicable platform to wire redox enzymes in an active configuration on a p-type semiconductor photocathode through the engineering of the enzyme-materials interface.
authors: Department of Chemistry University of Cambridge Cambridge CB2 1EW UK; ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute/AIIM Faculty Innovation Campus University of Wollongong Wollongong NSW 2522 Australia.
authors: Chong-Yong
authors: CY
authors: Lee
authors: Department of Chemistry University of Cambridge Cambridge CB2 1EW UK; Fuel Cell Research Center Korea Institute of Science and Technology (KIST) 02792 Seoul Republic of Korea.
authors: Hyun S
authors: HS
authors: Park
authors: Metalloproteins Unit, Institut de Biologie Structurale, CEA, CNRS Université Grenoble Alpes 38044 Grenoble France.
authors: Juan C
authors: JC
authors: Fontecilla-Camps
authors: Department of Chemistry University of Cambridge Cambridge CB2 1EW UK.
authors: Erwin
authors: E
authors: Reisner
keywords: Halbleiter; Hydrogenase; Photoelektrochemie; TiO2; Wasserstoffentwicklung