We are involved in the three following research themes:
• Operando X-ray spectroscopy of electrocatalytic reactions
• Electronic structure of biomimetic and bioinspired molecular systems
• Microfluidic and electochemical instrumentation
Operando X-ray spectroscopy of electrocatalytic reactions
Since more than a decade, we have been interested in the study of electrocatalytic systems based on transition metal oxides or sulfides, as well as molecular complexes. These systems are active for the oxygen (OER) and hydrogen (HER) evolving reactions, as well as the CO2 reduction reaction (CO2RR). X-ray absorption spectroscopy is our main tool to understand the local and electronic structure of these catalysts and follow their evolution under operating conditions.
Dr. Marion Giraud, Dr. Jennifer Peron, Université Paris Cité, Paris, France
Dr. Cédric Tard, Institut Polytechnique de Paris, Palaiseau, France
Dr. Sophie Carenco, Dr. David Portehault, Sorbonne Université, Paris, France
Pr. Ovidiu Ersen, Université de Strasbourg, Strasbourg, France
Pr. Marc Robert, Dr. Elodie Anxolabéhère-Mallart, Université Paris Cité, Paris, France
Multiple C–C bond formation upon electrocatalytic reduction of CO2 by an iron-based molecular macrocycle
Electronic structure of biomimetic and bioinspired molecular systems
We have been interested in synthesizing and characterizing biomimetic molecular complexes that model the Oxygen Evolving Center of Photosystem II for more than a decade, using both electrochemistry and spectroscopy. We are particularly interested in understanding their electronic structure and the distribution of the electronic density between the metal and its ligands. To this end, we use a combination of electrochemistry, UV-Visible, EPR and mostly X-ray spectroscopies. These techniques allow determining the oxidation and spin state, as well as the geometry of the metal of interest. We have studied mononuclear and polynuclear manganese complexes, and more recently Rhodium, Ruthenium and Iron complexes, all relevent to energy-related reactions such as the OER, HER or CO2RR.
Dr. Zakaria Halime, Pr. Ally Aukauloo, Université Paris-Saclay, Orsay, France
Pr. Gary Moore, Arizona State University, Tempe, USA
Pr. Julio Lloret-Fillol, ICIQ, Tarragona, Spain
Pr. James Blakemore, University of Kansas, Lawrence, USA
Electrochemical cell design
We develop specific electrochemical cells that allow probing electroactive or catalytic species with X-ray spectroscopy under in situ/operando conditions. These cells can feature heterogeneous or homogeneous systems under static or flowing conditions.
Microfluidics: mixing, sorting, trapping, freezing
We develop microfluidic systems that allow mixing, sorting or trapping (bio)chemical species or biological objects (cells, crystals). Theses systems are combined with synchrotron-base techniques, which are used to probe the structure of these objects under in situ conditions and with time-resolution.
Pr. Yves Méchulam, Dr. Emmanuelle Schmitt, Dr. Pierre-Damien Coureux, Institut Polytechnique de Paris, Palaiseau, France
Dr. Jean-Blaise Brubach, Synchrotron SOLEIL, Gif-sur-Yvette, France