Synthesis and super capacitance of goethite/reduced graphene oxide for supercapacitors

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• 作者：Huan Xu ; Zhongai Hu ; Ailian Lu ; Yingying Hu ; Li Li ; Yuying Yang ; Ziyu Zhang ; Hongying Wu
• 关键词：Composite materials ; Chemical synthesis ; Electrochemical techniques ; Electrochemical properties
• 刊名：Materials Chemistry and Physics
• 出版年：2013
• 出版时间：15 August, 2013
• 年：2013
• 卷：141
• 期：1
• 页码：310-317
• 全文大小：2761 K

文摘

We report a one-step fabrication of ¦Á-iron oxyhydroxide/reduced graphene oxide (¦Á-FeOOH/rGO) composites, in which the ferrous sulfate (FeSO₄¡¤7H₂O) are used as the iron raw and reducing agent to grow goethite (¦Á-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 ¦Á-FeOOH to rGO is up to 80.3:19.7. In addition, the ¦Á-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 ¦Á-FeOOH/rGO composites in the applications of high-performance energy-storage.