Micro/Nano Energy Storage Devices Based on Composite Electrode Materials

It is vital to improve the electrochemical performance of negative materials for energy storage devices. The synergistic effect between the composites can improve the total performance. In this work, we prepare α-Fe₂O₃@MnO₂ on carbon cloth through hydrothermal strategies and subsequent electrochemical deposition. The α-Fe₂O₃@MnO₂ hybrid structure benefits electron transfer efficiency and avoids the rapid decay of capacitance caused by volume expansion. The specific capacitance of the as-obtained product is 615 mF cm^-2 at 2 mA cm^-2. Moreover, a flexible supercapacitor presents an energy density of 0.102 mWh cm^-3 at 4.2 W cm^-2. Bending tests of the device at different angles show excellent mechanical flexibility.