23^-rd International Conference ABAF (Advanced Batteries, Accumulators and Fuel Cells), BRNO 2022

August 21^st - August 24^th 2022

Hybrid Supercapacitors Based of MnO₂–Carbon Xerogels Operating in Aqueous Electrolyte

L. Soserov, B. Mladenova, S. Veleva, B. Karamanova, A. Stoyanova

Hybrid supercapacitors systems are based on the coupling of a battery electrode with a carbon electrode, while allowing the latter to operate over the widest possible potential range and to increase the limited of conventional carbon/carbon capacitors. In this work, hybrid supercapacitors based on Activated carbon xerogels (AXs), α-MnO₂ and Aquvion E87-05S membrane socked in 1 M Na₂SO₄ were studied. AXs are synthetic carbon materials, obtained from the polymerization reactions between a Resorcinol and a Formaldehyde in the solvent, with different pH of the precursor solution (5.97 and 6.5). They possesses high purity, surface area, porosities, and pore volume. These properties make them promising materials for supercapacitors applications. α-MnO₂ is synthesized by a simple co-precipitation technique and exhibits pseudocapacitive performances. The hybrid supercapacitors based on AXs/MnO₂ are a perspective and provide higher energy density than the symmetric systems.