Missions

Electrochemical reactions are set to play a massive role in the energy landscape of the near future. Whether in electrolyzers, batteries or supercapacitors, the solid-liquid interface is where it all happens, where electrons and charges are transferred across energy barriers, either for storage or to trigger catalytic reactions. Our understanding of this part of electrochemical devices is still limited, mainly due to a lack of observational tools. More specifically, the concentration of ions in the liquid phase in the vicinity (1-10 nm) of an electrode remains elusive, especially under an applied electrochemical potential. The local and electronic structure of these ions, once in place, is also poorly understood. We therefore propose to develop spectroscopic methods for probing this interface under electrochemical conditions, specifically in the context of electrocatalysis.

Activités

As part of a junior professorship in the ITODYS laboratory (CNRS/Université Paris Cité), we are looking for a post-doctoral fellow to contribute to the development and application of these methods. His/her task will be to design, carry out and analyze in situ spectroscopy experiments to probe the composition and structure of electrolytes at the solid-liquid interface under electrochemical conditions. Infrared and X-ray spectroscopies will be our main tools, but other suggestions are welcome. Our strategy is to maximize the solid-liquid interface by using porous, conductive materials with high specific surface areas. Electrolytes will first be studied as solutions, then under electrochemical potential and, finally, in the presence of electrocatalytic species. By modifying the parameters of the electrolytes, the conductive material and the electrocatalyst, a complete picture of the electrolyte's behavior under electrocatalytic conditions will be obtained. Laboratory instruments will be available for ex situ and in situ IR and X-ray spectroscopy, complemented by specific synchrotron campaigns. The post-doc will be part of the PIXEL team, dedicated to the study of electrochemical reactions using imaging and spectroscopic techniques.

Compétences

We are looking for a highly motivated candidate with a PhD in experimental sciences (physics, chemistry, materials science) and a strong interest in electrochemistry. Demonstrated experience in X-ray absorption and/or infrared spectroscopy is expected, including data analysis. Experience in electrochemistry is also required, while basic knowledge of inorganic chemistry and materials characterization is expected. A strong motivation for experimental work and instrumental developments is required, while knowledge of theoretical chemistry, in MD or DFT, would be a plus but is not necessary. The ability to work both as part of a collaborative team and independently is mandatory, as are excellent communication skills (both written and oral) in English. French is not required.

Contexte de travail

The ITODYS laboratory is home to 200 researchers with expertise in physical chemistry related to surface science, synthesis methods and (photo/electro)catalysis. It offers a wide range of characterization techniques, from imaging (TEM, SEM, AFM) to spectroscopy (NMR, IR, XPS, XAS) and product analysis (GC, GC-MS, ATD/ATG).
The PIXEL team comprises four CNRS researchers, a senior lecturer, an engineer and a dozen PhD and post-doctoral students. All are interested in the study of electrochemical reactions using imaging or spectroscopic tools, and in the development of these tools and methods for analyzing the data they enable to be collected.
The project is supported by a Junior Professorship and has the necessary funds for the purchase of equipment and participation in conferences.

Contraintes et risques

Classic chemical risks. Allow for periods of travel and intensive work during synchrotron data collection sessions.