Fe 2 O 3  Particles Loaded on Sea Urchin-Like Comn 2 O 4  Nanoneedles for High-Performance Supercapacitors

Abstract

Transition metal oxides are widely used as electrode materials for supercapacitors due to their high capacitance and stability. Composite materials comprising two transition metal oxides may exhibit enhanced performance based on the properties of each material. In this study, a two-step hydrothermal method was used to fabricate CoMn2O4 needle clusters loaded with Fe2O3 structures. CoMn2O4 serves as an excellent bimetallic oxide electrode material for supercapacitors and acts as a scaffold for loading Fe2O3 particles, thereby further improving electrochemical performance. CoMn2O4@Fe2O3 exhibited a high specific capacitance of 710 F g-1 at 1 A g-1. The CoMn2O4@Fe2O3//GO asymmetric supercapacitor achieved a high energy density of 36.2 Wh kg-1 at 801 W kg-1, with a capacitance retention of 84% after 10,000 cycles.

Keywords: Supercapacitor, CoMn2O4, Fe2O3, composite material, electrode materials