Premium
Controlling Solar Hydrogen Production by Organizing Porphyrins
Author(s) -
Nikolaou Vasilis,
Charalambidis Georgios,
Ladomenou Kalliopi,
Nikoloudakis Emmanouil,
Drivas Charalambos,
Vamvasakis Ioannis,
Panagiotakis Stylianos,
Landrou Georgios,
Agapaki Eleni,
Stangel Christina,
Henkel Christian,
Joseph Jan,
Armatas Gerasimos,
Vasilopoulou Maria,
Kennou Stella,
Guldi Dirk M.,
Coutsolelos Athanassios G.
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002761
Subject(s) - catalysis , porphyrin , photocatalysis , platinum , chemistry , adsorption , hydrogen production , electron transport chain , nanoparticle , palladium , platinum nanoparticles , photochemistry , chemical engineering , turnover number , nanotechnology , combinatorial chemistry , materials science , organic chemistry , biochemistry , engineering
In this study, a highly efficient photocatalytic H 2 production system is developed by employing porphyrins as photocatalysts. Palladium and platinum tetracarboxyporphyrins (PdTCP and PtTCP) are adsorbed or coadsorbed onto TiO 2 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 H 2 evolution, as in the absence of TiO 2 NPs no catalytic activity is detected. Notably, J‐aggregated PtTCPs are more efficient for H 2 production than H‐aggregated PdTCPs. In this approach, a single porphyrin, which self‐organizes onto TiO 2 NPs, acts as the light harvester and simultaneously as the catalyst, whereas TiO 2 serves as the electron transport medium. Importantly, the concurrent adsorption of PdTCP and PtTCP onto TiO 2 NPs results in the most efficient catalytic system, giving a turnover number of 22,733 and 30.2 mmol(H 2 ) g(cat) −1 .