1.5 V Symmetric supercapacitor device based on hydrothermally synthesized Carbon nanotubes and Cobalt Tungstate nanocomposite electrodes
| Autor: | Jin Hyeok Kim, Abhishek C. Lokhande, Taeksoo Ji, V.C. Lokhande, Seung Jin Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Supercapacitor
Nanocomposite Materials science chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Capacitance 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Tungstate Chemical engineering law Electrode General Materials Science 0210 nano-technology Cobalt |
| Zdroj: | Materials Chemistry and Physics. 211:214-224 |
| ISSN: | 0254-0584 |
| Popis: | This study reports the hydrothermal synthesis and electrochemical performance of Cobalt Tungstate (CoWO4) and Carbon nanotubes and Cobalt Tungstate nanocomposite (CNT-CoWO4) as supercapacitor electrode material. The active materials are directly deposited on carbon cloth substrates to fabricate binder free electrodes which exhibited specific capacitance of 1443 F g-1 and 1486 Fg-1 at 5 mVs−1 scan rate for CoWO4 and CNT-CoWO4 samples, respectively. As a result of increase in potential window (1 V for nanocomposite CNT-CoWO4 as compared to 0.6 V for CoWO4) and higher specific capacitance in three electrode system, CNT-CoWO4 electrode delivers higher energy density than the CoWO4 electrode. A symmetric capacitor is fabricated from CNT-CoWO4 nanocomposite electrodes. The performance of symmetric capacitor, operated within a potential window of 1.5 V, is comparable to the asymmetric devices. Furthermore, the device delivered maximum energy density of 12 W h kg−1 at 432 W kg-1 power density. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect