Deep Eutectic Solvent (DES) for In Situ Templating Carbon Material: Carbon Characterization and Application in Supercapacitors Containing Multivalent Ions

The development of carbon materials with desirable textures and new aqueous electrolytes is the key strategy to improve performance supercapacitors. Herein, a deep eutectic solvent (DES) was used for in situ templating material. A material characterized (XRD, N2-physisorption, FTIR, SEM EDS) as an electrode first time multivalent-based In performed using novel DES, which serves precursor generation MgO. MgO its roles were discussed. Templating lead increase surface area microporous texture. obtained tested multivalent-ion (Al3+ Mg2+) compared H2SO4. charge-storage mechanism investigated elaborated. highest specific capacitance Al(NO3)3 electrolyte, while operating voltage follows order: Mg(NO3)2 > Electrical double-layer (versus pseudocapacitance) dominant all electrolytes. larger multivalent consequence lower fraction free water, suppresses hydrogen evolution (when H2SO4). GCD experimentally on showed good cyclic stability, energy density 22.3 Wh kg−1 at 65 W kg−1.