Benedikt LASSALLE, synchrotron-soleil

Résumé :

Controlling the composition, morphology and size of nanomaterials is key to tune their properties and function. This control requires fundamental insights into the processes that govern the synthesis of nanomaterials, but also their behaviour under functioning conditions. X-ray absorption spectroscopy is an ideal tool to observe such phenomena, since it can be used to probe reactions under in situ conditions, allowing experimental setups that are close to synthetic or operating conditions.
In this presentation, we will report our work on the structure and function of electrocatalytic materials, such as oxides and sulfides, that are active for the oxygen (OER) and hydrogen evolution reactions (HER). Using in situ X-ray absorption spectroscopy as our major tool, we will show how the local and electronic structure of the materials evolve during these catalytic reactions and influence their efficiency.
In a second part, we will present our recent work concerning the combination of microfluidic systems with X-ray techniques and their potential application to understand the synthesis of nanomaterials. This will be exemplified with an upcoming project to be carried out in collaboration with the team of Ovidiu Ersen at the IPCMS, which deals with the study of hybrid perovskites synthesis by a combination of XAS and electronic microscopy.

Pour tout contact : Ovidiu Ersen (0388107028 – ovidiu.ersen@ipcms.unistra.fr)