Photoelectrochemical H2 Evolution with a Hydrogenase Immobilized on a TiO2-Protected Silicon Electrode

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• 作者：Dr. Chong-Yong Lee ; Dr. Hyun S. Park ; Dr. Juan C. Fontecilla-Camps and Dr. Erwin Reisner
• 刊名：Angewandte Chemie
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：128
• 期：20
• 页码：6075-6078
• 全文大小：1172K
• ISSN：1521-3757

文摘

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 TiO₂ layer, 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 H₂ at 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.