A Bioinspired System for Light-Driven Water Oxidation with a Porphyrin Sensitizer and a Tetrametallic Molecular Catalyst
作者： Mirco Natali , Elisa Deponti , Debora Vilona , Andrea Sartorel , Marcella Bonchio
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摘要: Inspired by natural photosynthesis, the aim of light-driven water splitting is to produce renewable fuels exploiting solar radiation. Sustained hydrogen production desirable in such systems, and oxidation oxygen currently recognized as bottleneck entire process. Therefore, solutions for this difficult task retain a fundamental interest. In paper, we present bioinspired, three-component system that comprises tetracationic porphyrin ZnII complex photosensitizer, tetraruthenium water-oxidation catalyst, sodium persulfate electron acceptor. An in-depth photophysical study reveals photogeneration pentacation radical (quantum yield up Φ = 1.01) upon oxidative quenching triplet excited state persulfate. Electron transfer from catalyst (hole scavenging) slow (bimolecular rate constant, k < 4 × 107 M–1 s–1), likely main reason low efficiency photocatalytic tests oxidation. Perspectives improvements development light-activated device are discussed.
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