| Autor: |
Yuying Yang, Yingying Hu, Huan Xu, Ziyu Zhang, Hongying Wu, Zhongai Hu, Li Li, Ailian Lu |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Materials Chemistry and Physics. 141:310-317 |
| ISSN: |
0254-0584 |
| DOI: |
10.1016/j.matchemphys.2013.04.048 |
| Popis: |
We report a one-step fabrication of α-iron oxyhydroxide/reduced graphene oxide (α-FeOOH/rGO) composites, in which the ferrous sulfate (FeSO4·7H2O) are used as the iron raw and reducing agent to grow goethite (α-FeOOH) and reduce graphite oxide (GO) to rGO in the same time. The morphology, composition and microstructure of the as-obtained samples are systematically characterized by thermogravimetric (TG) analysis, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and FT-IR. Moreover, their electrochemical properties are investigated using cyclic voltammetry and galvanostatic charge/discharge techniques. The specific capacitance of 452 F g−1 is obtained at a specific current of 1 A g−1 when the mass ratio of α-FeOOH to rGO is up to 80.3:19.7. In addition, the α-FeOOH/rGO composite electrodes exhibit the excellent rate capability (more than 79% retention at 10 A g−1 relative to 1 A g−1) and well cycling stability (13% capacitance decay after 1000 cycles). These results suggest the importance and great potential of α-FeOOH/rGO composites in the applications of high-performance energy-storage. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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