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 FeCo2O4 nanomaterials through a facile hydrothermal method followed by annealing treatment. The as-prepared FeCo2O4 nanomaterials possessed a porous chopsticks-like microstructure, and the BET surface areas reached 85.32 m2 g−1. When the porous chopsticks-like FeCo2O4 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 FeCo2O4// 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 FeCo2O4 nanomaterials have great potential application for supercapacitors.