Controlling Solar Hydrogen Production by Organizing Porphyrins
Autor: | Georgios Charalambidis, Stylianos Panagiotakis, Vasilis Nikolaou, Gerasimos S. Armatas, Eleni Agapaki, Georgios Landrou, Dirk M. Guldi, Ioannis Vamvasakis, Maria Vasilopoulou, Emmanouil Nikoloudakis, Charalambos Drivas, Christian Henkel, Kalliopi Ladomenou, Christina Stangel, Jan Joseph, Athanassios G. Coutsolelos, Stella Kennou |
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Rok vydání: | 2020 |
Předmět: |
General Chemical Engineering
chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Porphyrin 0104 chemical sciences Catalysis Turnover number chemistry.chemical_compound General Energy Adsorption chemistry Photocatalysis Environmental Chemistry General Materials Science 0210 nano-technology Platinum Palladium |
Zdroj: | ChemSusChem. 14(3) |
ISSN: | 1864-564X |
Popis: | In this study, a highly efficient photocatalytic H2 production system is developed by employing porphyrins as photocatalysts. Palladium and platinum tetracarboxyporphyrins (PdTCP and PtTCP) are adsorbed or coadsorbed onto TiO2 nanoparticles (NPs), which act as the electron transport medium and as a scaffold that promotes the self-organization of the porphyrinoids. The self-organization of PdTCP and PtTCP, forming H- and J-aggregates, respectively, is the key element for H2 evolution, as in the absence of TiO2 NPs no catalytic activity is detected. Notably, J-aggregated PtTCPs are more efficient for H2 production than H-aggregated PdTCPs. In this approach, a single porphyrin, which self-organizes onto TiO2 NPs, acts as the light harvester and simultaneously as the catalyst, whereas TiO2 serves as the electron transport medium. Importantly, the concurrent adsorption of PdTCP and PtTCP onto TiO2 NPs results in the most efficient catalytic system, giving a turnover number of 22,733 and 30.2 mmol(H2 ) g(cat)-1 . |
Databáze: | OpenAIRE |
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