General Scheme for Oxidative Quenching of a Copper Bis-Phenanthroline Photosensitizer for Light-Driven Hydrogen Production
| Autor: | Margherita Orazietti, Roger Alberto, Peter Hamm, Johannes Windisch, Benjamin Probst |
|---|---|
| Přispěvatelé: | University of Zurich, Alberto, Roger |
| Rok vydání: | 2016 |
| Předmět: |
10120 Department of Chemistry
1-Methyl-4-phenylpyridinium Light 2100 General Energy General Chemical Engineering Inorganic chemistry chemistry.chemical_element Electron donor 010402 general chemistry Photochemistry 01 natural sciences Electron transfer chemistry.chemical_compound 540 Chemistry Organometallic Compounds Environmental Chemistry Photosensitizer General Materials Science 1500 General Chemical Engineering Hydrogen production Photosensitizing Agents Quenching (fluorescence) 010405 organic chemistry Photochemical Processes Copper 2500 General Materials Science 0104 chemical sciences General Energy Catalytic cycle chemistry 2304 Environmental Chemistry Oxidation-Reduction Cobalt Hydrogen Phenanthrolines |
| Zdroj: | ChemSusChem |
| DOI: | 10.1002/cssc.v9.13 |
| Popis: | A new, general reaction scheme for photocatalytic hydrogen production is presented based on oxidative quenching of a homoleptic copper(I) bis-1,10-phenanthroline photosensitizer (PS) by 1-methyl-4-phenyl-pyridinium (MPP(+) ) as the electron relay and subsequent regeneration of the so formed copper(II) complex by a sacrificial electron donor. Electron transfer from the relay to various cobalt based water reduction catalysts and subsequent H2 production was shown to close the catalytic cycle. Transient absorption experiments unambiguously confirmed the proposed pathway, both the oxidative quenching and subsequent regeneration of oxidized PS. Photocatalytic test runs further confirmed the role of MPP(+) and up to 10 turnovers were achieved in the relay. The performance limiting factor of the system was shown to be the decomplexation of the copper PS. Quantum yields of the system were 0.03 for H2 production, but 0.6 for MPP(.) formation, clearly indicating that unproductive pathways still prevail. |
| Databáze: | OpenAIRE |
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