Ethylenediamine-assisted crystallization of Fe2O3 microspindles with controllable size and their pseudocapacitance performance

Abstract

In the present work, size-tunable Fe₂O₃ microspindles were crystallized by a simple feasible ethylenediamine (EN) ligand-controlled hydrothermal approach. The size of Fe₂O₃ microspindles can be controlled from several hundreds of nanometers to above 1 micrometer. Fe₂O₃ particles with spindle-like structure can be controlled well via the assistance of EN. A clear growth pathway of the EN-assisted synthesis of Fe₂O₃ microspindles was illustrated by us. As-obtained Fe₂O₃ microspindles in different sizes exhibit high specific capacitance values of 558.7, 496.6, 504.7 and 271.0 F g⁻¹, which are much higher than previous reported results. The smaller size of Fe₂O₃ microspindles can lead to higher specific capacitance.