Patrice Simon1 2

1, Univ Paul Sabatier-Toulouse III, Toulouse, , France
2, RS2E, FR CNRS 3459, Amiens, , France

We will firstly show how the careful design of nanostructured carbons can help in preparing high energy density carbons for supercapacitor applications, using conventional electrolytes (solvent plus salt), as well as neat ionic liquid and ionogel electrolytes. Moving from double layer to pseudocapacitive materials, we will show how the control of the electrodes structure can help in preparing high capacitance electrodes using 2-Dimensional MXene materials in aqueous electrolytes. In neat ionic liquid electrolyte, the combination of in-situ XRD with electrochemical techniques evidenced a difference in the charge storage mechanism depending on the electrode polarization.
This set of results helped in developing our basic understanding of the ion fluxes at the electrolyte / material interface as well as ion interactions in confined pores. From a practical point of view, they offer new opportunities for designing high energy density supercapacitors and micro-supercapacitors.