Abstract
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 147Fg−1 at 0.36Ag−1 in 1moldm−3 Li2SO4 electrolyte, good cycling stability, and with a wide potential window of 1.0V. 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.
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