Fe2O3 particles loaded on sea urchin-like CoMn2O4 nanoneedles for high-performance supercapacitors

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 CoMn 2 O 4 needle clusters loaded with Fe 2 O 3 structures. CoMn 2 O 4 serves as an excellent bimetallic oxide electrode material for supercapacitors and acts as a scaffold for loading Fe 2 O 3 particles, thereby further improving electrochemical performance. CoMn 2 O 4 @Fe 2 O 3 exhibited a high specific capacitance of 760 F g −1 at 1 A g −1 . The CoMn 2 O 4 @Fe 2 O 3 //GO asymmetric supercapacitor achieved a high energy density of 21.3 Wh kg −1 at 4021 W kg −1 and 36.3 Wh kg −1 at 803.4 W kg −1 , with a capacitance retention of 83 % after 10,000 cycles.