Conjugated polyfluorene imidazolium ionic liquids intercalated reduced graphene oxide for high performance supercapacitor electrodes
| Autor: | Jishan Wu, Lu Mao, Yuan Li, Hardy S. O. Chan, Chunyan Chi |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Supercapacitor
Materials science Renewable Energy Sustainability and the Environment Graphene Inorganic chemistry Oxide Electrolyte Electrochemistry law.invention Polyfluorene chemistry.chemical_compound chemistry law Electrode Ionic liquid General Materials Science Electrical and Electronic Engineering |
| Zdroj: | Nano Energy. 6:119-128 |
| ISSN: | 2211-2855 |
| Popis: | We report a new concept of using conjugated polyfluorene imidazolium ionic liquids (PILs) intercalated reduced graphene oxide for high performance supercapacitor electrode materials. Two polyfluorene homo-polymer (hoPIL) and co-polymer (co-PIL) carrying hexyl imidazolium bromide side chains were designed and synthesized. Their corresponding intercalated reduced graphene oxide materials hoPIL-RGO and coPIL-RGO exhibited good electrochemical performance in aqueous electrolytes as well as in ionic liquid electrolyte 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4). High specific capacitances of 222 F g−1 at a current density of 0.2 A g−1 and 132 F g−1 at 0.5 A g−1 were obtained for coPIL-RGO in 6 M KOH and BMIMBF4 accordingly. When assembled into a symmetric two-electrode cell with graphene materials as electrodes and BMIMBF4/acetonitrile (1:1) as electrolyte, an energy density of 14.7 Wh kg−1 was obtained for coPIL-RGO at a current density of 0.5 A g−1, and a maximum power density of 347 kW kg−1 was achieved for hoPIL-RGO at a current density of 5 A g−1 with good cycling stability. |
| Databáze: | OpenAIRE |
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