A facile synthetic protocol of α-Fe2O3@FeS2 nanocrystals for advanced electrochemical capacitors

Abstract

Hybrid structured semiconductor nanomaterials show excellent electrochemical properties due to the synergistic effect between different components. In this work, we report granular α-Fe₂O₃@FeS₂ nanocrystals by a one-pot hydrothermal route. The as-obtained product as an electrode material shows excellent charge transfer ability and cyclic stability. The specific capacitance of an asymmetric hybrid capacitor is 1155.74 mF cm⁻² at 2 mA cm⁻². In addition, the device delivers a power density of 27.99 mW cm⁻³ at an energy density of 1.12 mW h cm⁻³. This suggests that the synthesized composite electrodes can be candidate materials for future energy storage devices.