High-Performance Cobalt-Doped Carbon Cloth Supported Porous Fe2o3 Flexible Electrode Material in Quasi-Solid Asymmetric Supercapacitors

Iron oxide, as a promising anode material, has environmental friendliness, high theoretical capacitance and wide voltage window. Cobalt-doped iron oxide was supported on flexible carbon cloth (Co-Fe 2 O 3 @CC) via hydrothermal reaction. Cobalt doping changes the iron oxide crystal structure and improves the conductivity of the iron oxide. At the same time, it also increases the oxidation state of iron oxide and improves the pseudocapacitance of the electrode material. The reaction conditions are controlled to prepare iron oxide nano-spheres with porous morphology. The porous structure increases the area where the electrode material is reacted. The specific capacitance of the Co-Fe 2 O 3 @CC electrode material is 315.6 mF cm -2 , which is 137.2% higher than the area specific capacitance (133 mF cm -2 ) of pure Fe 2 O 3 @CC. The capacitance is basically unchanged before and after 200 times of 90° bending. The voltage window of assembled Co-Fe 2 O 3 @CC//Ni-MnO 2 @CC asymmetric supercapacitors is 0-2 V. When the energy density is 0.96 mWh cm -3 and the power density is 28.6 mW cm -3 , it has excellent electrochemical performance. After 4000 cycles at a current density of 10 mA cm -2 , the capacitance was retained 85%. Flexible asymmetric supercapacitors have potential applications in the field of flexible wearables