Electrochemical Hybrid Supercapacitors Based on Activated Carbon and Iron Oxides

Antonia Stoyanova

Antonia Stoyanova Institute of Electrochemistry and Energy Systems – BAS, 10 G. Bonchev Str., BG-1113 Sofia.

Keywords: Hybrid Supercapacitors, Activated Carbon, Iron Oxides, Non-Aqueous Electrolyte.

Abstract

Hybrid lithium battery-supercapacitor is developed using nanosized electrode materials – activated carbon and iron oxides (magnetite and hematite) and a non-aqueous electrolyte. The hybrid cell is assembled by an electrode of activated carbon, a composite electrode with activated carbon matrix
and addition of 50 wt.% Fe3O4 or Fe2O3. Symmetric supercapacitor cell, composed by two identical electrodes of activated carbon is also assembled and tested for comparison. The supercapacitor cells are subjected to charge/discharge cycling test under galvanostatic conditions at different current loads and continuous cycling. The hybrids supercapacitors developed, especially
the magnetite based cell, demonstrate high current efficiency (up to 95%) and specific capacity higher (with 20-50%) than the capacities of the basic symmetric capacitor (about 50 Fg-1) as well as stable capacity behaviors at prolong cycling. The results prove the possibility of application of
magnetite and hematite as electrochemically active material for hybrid lithium battery–supercapacitor systems.

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