α-Fe₂O₃: Hydrothermal Synthesis, Magnetic and Electrochemical Properties

Abstract

The size- and shape-controlled fabrication of α-Fe₂O₃ has been successfully realized via a faicle template-free hydrothermal route, only simply changing reaction time and solvent used. The formation mechanisms of various nanostructures are proposed and the controlling factors on the morphology of the final product are also discussed. Furthermore, magnetic hysteresis measurements demonstrate that the as-obtained α-Fe₂O₃ nanostructures show structure-dependent magnetic properties. And the as-obtained α-Fe₂O₃ nanopolyhedra exhibits ultrahigh reversible capacity, and excellent capacity retention over 20 cycles. It is expected that the adjustable magnetic properties and high discharge capacity of the as-prepared samples make them useful with potential applications in magnetic nanodevices and high-energy batteries.