Thesis Defense Célia Clementz – Lundi 26 Octobre 2026

This thesis is supervised by Dr. Yann LEROUX – CNRS/ISCR – Université de Rennes and Dr. Corinne LAGROST – CNRS/ISCR – Université de Rennes

Examining Committee :
➖ Prof. Nathalie JOB – Département d’Ingénierie Chimique – Université de Liège – Reviewer
➖ Dr. Jean-Marc NOEL – CNRS/ITODYS – Université Paris Cité – Reviewer
➖ Dr. Conchi ANIA – CNRS/CEMHTI – UPR CNRS Orléans – Examiner
➖ Dr. Fannie ALLOIN – CNRS/LEPMI – Université de Grenoble-Alpes – Examiner
➖ Dr. Charles COUGNON – CNRS/MOLTECH-Anjou – Université d’Angers – Examiner

[📄 ABSTRACT] This PhD thesis focuses on the development of electrodes to achieve higher-performance supercapacitors. Supercapacitors are energy storage devicesused to rapidly store large amounts of energy. Generally, supercapacitor electrodes are made of porous materials, as a larger surface area leads to a higher storage capacity. However, these devices cannot store large amounts of energy compared to batteries. To improve their performance, we chose to modify the surface of porous carbons. To ensure a robust modification, we used aryl diazonium salt chemistry. These compounds spontaneously reduce on carbon surfaces to form a covalent bond. The molecule selected as a graft throughout this manuscript is nthraquinone, an electrochemically active molecule capable of transferring two electrons, hereby maximizing the energy density of the resulting materials. To characterize the modified materials, several surface analysis techniques were used, including X-ray photoelectron spectroscopy (XPS), nitrogen adsorption, and cyclic voltammetry.