Fe₂O₃ sheets grown on nickel foam as electrode material for electrochemical capacitors

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• 作者：Jichun Huang ; Sainan Yang ; Yang Xu ; Xiaobin Zhou ; Xue Jiang ; Nannan Shi ; Dianxue Cao ; Jinling Yin ; Guiling Wang
• 关键词：Iron oxide ; Sheets ; Nickel foam ; Capacitance ; Electrochemical capacitors
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：15 January, 2014
• 年：2014
• 卷：713
• 期：Complete
• 页码：98-102
• 全文大小：1462 K

文摘

Fe₂O₃ sheets have been synthesized on nickel foam by a simple template-free growth process and heat treatment. Structural characterization by SEM, TEM and BET indicates that the neighboring porous Fe₂O₃ sheets form a open reaction space on the surface of the nickel foam skeletons. The sheets are confirmed to be pure Fe₂O₃ phase by X-ray diffraction. The electrochemical capacitance behaviors of Fe₂O₃ sheets electrode are investigated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy tests. The results show that the Fe₂O₃ sheets electrode exhibits a specific capacitance as high as 147 F g^鈭? at 0.36 A g^鈭? in 1 mol dm^鈭? Li₂SO₄ electrolyte, good cycling stability, and with a wide potential window of 1.0 V. The superior capacitance of Fe₂O₃ sheets electrode might be attributed to its unique porous structure for easy access of electrolyte ions and high electrochemical activity.