|Title / Titel||Synthetic and Spectroscopic Studies for an Improved Photocatalytic System for H2 Generation|
|Abstract (PDF, 14 KB)|
|Summary / Zusammenfassung||The search for renewable, sustainable energy resources as well as the chemical storage of energy coming from sunlight, are most challenging research topics from a scientific point of view and relevant for societal development in the near future. In this broad context, it is an incentive to find in particular sunlight driven catalytic processes, which mimic photosynthesis and are able to convert highly diluted visible light into concentrated chemical energy. Simple molecules such as H2 and CO (as a precursor) are ideal candidates for this purpose. Despite the fact that working systems principally exist, two major problems remain to be solved in order to get beyond scientific studies. One is the ultimate source of electrons for the reduction of H+ to H2 and CO2 to CO respectively, the other is an efficient catalytic system in terms of quantum yield and long term stability. Hence, it is the aim of this project to understand in depth the quenching mechanism of the excited state of rhenium photosensitizers, the fate (and nature) of electron donors and the mechanism of CO2 to CO reduction photocatalysed by rhenium complexes. Furthermore, we aim at developing Co-complexes which use this Re-system for the conversion of H+ to H2 with high efficiency and long term stability.
For these purposes, we present in this proposal an interdisciplinary project, aiming at mechanistic understanding and an improved Re and Re/Co photocatalytic molecular systems for H2 and CO generation as an artificial homogeneous photosynthetic entity. The proposal consists of two highly interlinked sub-projects, i.e. a synthetic part developing new molecular systems, and a time-resolved spectroscopic part elucidating their reaction mechanisms and thereby feeding back design criteria into the synthetic part. The interconnection of the two sub-projects will facilitate a more rational design of efficient photosensitizers.
|Publications / Publikationen||137) An efficient homogeneous intermolecular rhenium based photocatalytic system for the production of H2
Probst, B.; Kolano, C.; Hamm, P.; Alberto, R.
Inorg. Chem., 2009 in press
|Keywords / Suchbegriffe||Photocatalysis, Hydrogen, Sunlight, Energy, Ultrafast Spectroscopy, Infrared Spectroscopy, Cobalt, Rhenium|
|Project leadership and contacts /
Projektleitung und Kontakte
|Funding source(s) /
|SNF (Personen- und Projektförderung)
|Duration of Project / Projektdauer||Sep 2008 to Sep 2010|