Simple, Low-Cost Synthesis of an Iron Oxide and Carbon Foam Composite for Supercapacitor Electrodes

Wednesday, May 14, 2014
Grand Foyer, Lobby Level (Hilton Orlando Bonnet Creek)
H. Khani and D. O. Wipf (Mississippi State University)
Iron oxide-carbon foam (IOCF) materials with a high specific surface area and conductivity have been synthesized via a facile, cost-effective, and one-step template-free method. The structure and morphology of the IOCF composite have been investigated by electron microscopy, cyclic voltammetry, and Raman spectroscopy.  The as-prepared IOCF was coated on a nickel metal foam electrode as an active material for constructing supercapacitor electrodes. The electrochemical performance of IOCF composite electrodes was tested by cyclic voltammetry and galvanostatic charge/discharge in a Na2SO4 electrolyte. The as-assembled symmetric supercapacitor with optimal mass ratio can be operated reversibly over a wide voltage range of 0 to -1.0 V, and presents a high capacitance of 170 F g-1 in Na2SO4 aqueous electrolyte. Moreover, the supercapacitor exhibits excellent rate capability and retains a high capacity with extended cycling. These attractive results make this material promising as a component of an aqueous electrolyte-based supercapacitor having high energy and power densities.