Carbon nanotubes/cobalt sulfide composites as potential high-rate and high-efficiency supercapacitors
| Autor: | Huan-Tsung Chang, Zih-Yu Shih, Zusing Yang, Chia-Ying Chen |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
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Materials science Renewable Energy Sustainability and the Environment Composite number Energy Engineering and Power Technology chemistry.chemical_element Carbon nanotube Cobalt sulfide Nanomaterials law.invention chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry law Electrical and Electronic Engineering Physical and Theoretical Chemistry Composite material Cyclic voltammetry Cobalt |
| Zdroj: | Journal of Power Sources. 215:43-47 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2012.04.075 |
| Popis: | We have prepared carbon nanotube (CNT)/cobalt sulfide (CoS) composites from cobalt nitrate, thioacetamide, and CNTs in the presence of poly(vinylpyrrolidone). CNT/CoS composites are deposited onto fluorine-doped tin oxide glass substrates and then subjected to simple annealing at 300 °C for 0.5 h to fabricate CNT/CoS electrodes. Data collected from Raman spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and d -spacing reveal the changes in the CoS structures and crystalline lattices after annealing. Cyclic voltammetry results reveal that the annealed CNT/CoS composite electrodes yield values of 2140 ± 90 and 1370 ± 50 F g −1 for specific capacitance at scan rates of 10 and 100 mV s −1 , respectively. To the best of our knowledge, the annealed CNT/CoS composite electrodes provide higher specific capacitance relative to other reported ones at a scan rate of 100 mV s −1 . CNT/CoS composite electrodes yield a power density of 62.4 kW kg −1 at a constant discharge current density of 217.4 A g −1 . With such a high-rate capacity and power density, CNT/CoS composite supercapacitors demonstrate great potential as efficient energy storage devices. |
| Databáze: | OpenAIRE |
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