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-FeO@MnO on carbon cloth through hydrothermal strategies and subsequent electrochemical deposition. The α-FeO@MnO 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 at 2 mA cm. Moreover, a flexible supercapacitor presents an energy density of 0.102 mWh cm at 4.2 W cm. Bending tests of the device at different angles show excellent mechanical flexibility.