Abstract
The rational design and controllable synthesis of high-performance energy storage materials are important measures to address the growing demand for energy storage devices. This work grew a fishnet-like Fe2O3 nanorod@oxygen-rich carbon layer structure directly on carbon fiber cloth as a binder-free electrode for symmetric capacitors. The growth of Fe2O3 nanorods provided a large specific surface area, and the coating of the oxygen-rich carbon layer protected Fe2O3 nanorods as active substance. The further oxidation treatment created the rich electrochemically active sites by loading oxygen-containing functional groups onto the composite surface. As a result, the optimal OC@ Fe2O3-ACC sample exhibited a high areal specific capacitance of 1687 mF cm-2 at the current density of 1 mA cm-2. Meanwhile, an excellent capacity retention rate of 58.7 % was achieved at 15 mA cm-2. Lastly, the long-term cycling stability was verified with 80% retention rate of the initial capacitance after 12,000 cycles.