Célia Clementz PhD defense

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Condensed Matter and Electroactive Systems (MaCSE) team 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. Jury Nathalie JOB, Professeure, Département d'Ingénierie Chimique, Université de Liège / Rapporteure Jean-Marc NOEL, Chargé de recherche au CNRS-HDR, ITODYS, Université Paris Cité / Rapporteur Conchi ANIA, Directrice de recherche au CNRS, CEMHTI, UPR CNRS Orléans / Examinatrice Fannie ALLOIN, Directrice de recherche au CNRS, LEPMI , Université de Grenoble-Alpes/ Examinatrice Charles COUGNON, Directeur de recherche au CNRS, MOLTECH-ANJOU, Université d'Angers / Examinateur Direction de thèse Yann LEROUX, Chargé de recherche au CNRS-HDR, ISCR, Université de Rennes / directeur de thèse Corinne LAGROST, Drectrice de recherche au CNRS, ISCR, Université de Rennes / co-directrice de thèse Contacts Célia CLEMENTZ, celia.clementz@univ-rennes.fr Yann LEROUX, yann.leroux@univ-rennes.fr Corinne LAGROST, corinne.lagrost@univ-rennes.fr