Porous chopsticks-like FeCo2O4 by the hydrothermal method for high-performance asymmetric supercapacitors

Transition metal oxides can serve as advanced electrode materials and have attracted extensive attention in the past decade. Herein, we have been successfully synthesized the FeCo 2 O 4 nanomaterials through a facile hydrothermal method followed by annealing treatment. The as-prepared FeCo 2 O 4 nanomaterials possessed a porous chopsticks-like microstructure, and the BET surface areas reached 85.32 m 2 g −1 . When the porous chopsticks-like FeCo 2 O 4 were used to make the working electrode, the three-electrode test system showed the ultrahigh specific capacitance of 679.94 F g −1 at current density of 1 A g −1 and a remarkable cycling stability with 93.68% capacitance retention being stable after 4000 cycles. Furthermore, the assembled porous chopsticks-like FeCo 2 O 4 // AC-ASC cell device exhibited a high energy density of 50.85 Wh kg −1 at a power density of 799.98 W kg −1 and still maintained 38.79 Wh kg −1 at a higher power density of 12,799.63 W kg −1 , and long cyclic stability, with almost 78.46% capacity retention after 5600 cycles. These results firmly verify that the porous chopsticks-like FeCo 2 O 4 nanomaterials have great potential application for supercapacitors.