Combination of Organic Dye and Iron for CO<sub>2</sub> Reduction with Pentanuclear Fe<sub>2</sub>Na<sub>3</sub> Purpurin Photocatalysts
Huiqing Yuan, Jiehao Du, Mei Ming, Ya Chen, Long Jiang, Zhiji Han
Abstract
Molecular photocatalysts designed with earth-abundant elements are rare and challenging in artificial photosynthesis study. Herein, we report a multimetallic Fe2Na3 purpurin (1) complex for the reduction of CO2 in DMF under visible-light irradiation. The photocatalytic system achieves 91% selectivity and 2625 ± 334 turnovers of CO in 120 h, which is among the highest reported for a noble-metal-free catalyst without an additional photosensitizer. UV–vis and electrochemical studies suggest that the mechanism involves subsequent reductions and protonations of 1 to generate [FeII2Na3((H)2PP)6]5– and [FeIII2Na3((H)2PP)6]3– as the active photocatalysts in CO2 reduction.
Topics & Concepts
ChemistryPhotosensitizerArtificial photosynthesisPhotocatalysisSelectivityCatalysisElectrochemistryPhotochemistryVisible spectrumIrradiationPhotosynthesisMetalNuclear chemistryOptoelectronicsOrganic chemistryElectrodePhysical chemistryMaterials scienceBiochemistryPhysicsNuclear physicsCO2 Reduction Techniques and CatalystsCarbon dioxide utilization in catalysisAdvanced Photocatalysis Techniques