Electrolyte additive induced fast-charge/slow-discharge process: Potassium ferricyanide and potassium persulfate for CoO-based supercapacitors
| Autor: | Xuanxuan Han, Tao Jiang, Kun Xie, Xing Chen, Demin Jiang, Yuqiao Wang, Yinhua Jiang |
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| Rok vydání: | 2020 |
| Předmět: |
Supercapacitor
Materials science Inorganic chemistry 02 engineering and technology Potassium persulfate Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Redox 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Potassium ferricyanide chemistry.chemical_compound Colloid and Surface Chemistry chemistry Oxidizing agent 0210 nano-technology Current density |
| Zdroj: | Journal of Colloid and Interface Science. 576:505-513 |
| ISSN: | 0021-9797 |
| Popis: | The electrolyte additives of potassium ferricyanide and potassium persulfate can ensure that CoO-supercapacitors achieve a fast charge/slow discharge and long cycling stability. The redox couple of Fe(CN)63−/Fe(CN)64− can induce S2O82− to produce the sulfate radical ( S O 4 · - ). Strong oxidizing species, including S2O82−, Fe(CN)63− and S O 4 · - , can accelerate oxidation of the CoO electrode surface from Co2+ to Co3+ in the charge process. The additives can achieve a good synergistic effect on accelerating CoO oxidation during the charge process. In a three-electrode cell, a CoO electrode with electrolyte additives achieves a fast-charge and slow-discharge time of 939 s and 1699 s at a current density of 1 A g−1, respectively. The capacitance retention can be maintained at 84.5% after 10,000 cycles at a current density of 5 A g−1. As a supercapacitor, the device can achieve a fast-charge and slow-discharge time of 156 s and 191 s at a current density of 1 A g−1, respectively. The capacitance retention can be maintained at 85.5% after 10,000 cycles at a current density of 5 A g−1. |
| Databáze: | OpenAIRE |
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