Electrochemical supercapacitive performance of Hematite alpha-Fe2O3 thin films prepared by spray pyrolysis from non-aqueous medium

摘要

In present work, we report the electrochemical supercapacitor performance Hematite alpha-Fe2O3 thin films prepared by spray pyrolysis from non-aqueous medium. The structural, morphological optical and electrochemical properties of the alpha-Fe2O3 thin films are studied. The alpha-Fe2O3 has shown Rhombohedral (Hematite) crystal structure. Scanning electron microscopy results reveal that the alpha-Fe2O3 thin films have well covered nanoporous surface. The as prepared films exhibited a direct band gap energy varying from 2.36 to 2.14 eV. The alpha-Fe2O3 thin films showed a maximum specific capacitance 451 F g(-1) within potential window -1.1 to 0.2 V in aqueous 2 M KOH electrolyte. Further, alpha-Fe2O3 electrode based supercapacitor showed 1.3 V wide voltage window with specific energy and specific power of 45 W h kg(-1) and 1.25 kW kg(-1) at 4 A g(-1) respectively. Such nanoporous alpha-Fe2O3 thin film with high performance may be used as a promising material for electrochemical supercapacitors. (C) 2016 Elsevier B.V. All rights reserved.