Abstract
We demonstrate an ultrahigh energy density asymmetric supercapacitor (ASC) having a novel NiCo(CO3)(OH)2 nanoneedle positive electrode, Fe2O3/rGO nanocomposite negative electrode, and advanced potassium ferricyanide (K3[Fe(CN)6])/potassium hydroxide (KOH) electrolyte. The electrode materials were synthesized by a hydrothermal technique. The unique positive electrode was first shown to have a remarkable specific capacitance (Csp) of 3248.9 F g-1 at 1 A g-1 in an electrolyte containing 0.06 M K3[Fe(CN)6] and 3 M KOH. The ASC gives a superior energy density of 84.1 W h kg-1 at a power density of 825 W kg-1. The findings in this work provide a very promising approach toward the development of high-performance energy storage devices.
Original language | English |
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Pages (from-to) | 18023-18033 |
Number of pages | 11 |
Journal | ACS Sustainable Chemistry and Engineering |
Volume | 8 |
Issue number | 49 |
DOIs | |
Publication status | Published - 2020 Dec 14 |
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Renewable Energy, Sustainability and the Environment