Construction of flexible MnCoO@FeCoNi-LDH electrode materials with nanoflower-like and hierarchical structure for high-performance asymmetric supercapacitor.

In the realm of energy storage, flexible portable supercapacitors have been receiving increasing attention in the last few years. Nonetheless, the process of choosing appropriate flexible materials remains challenging. Herein, we successfully synthesized a flower-like MnCoO@FeCoNi-LDH/CC (MnCo@FCN/CC) hierarchically nanostructured electrode material by anchoring MnCoO (MnCo) on a flexible carbon cloth (CC) substrate first and then loading FeCoNi-LDH nanosheets on MnCoO. The synthesized MnCo@FCN/CC material has numerous mesopores, huge specific surface area and multivalent metal ions, which makes MnCo@FCN/CC nanomaterial possess powerful electrochemical reaction kinetics and exceptional cycle stability. As a result, the electrode material exhibits a high specific capacitance (C) value of 2235F g and maintains 88.6 % of the initial capacitance after 10,000 cycles. Significantly, a flexible asymmetric supercapacitor (ASC) constructed in the form of MnCo@FCN/CC//AC/CC has excellent energy density (51.66 Wh kg at 890.81 W kg), and after 10,000 times of constant current charging and discharging, the capacitance retention rate still reaches 92.9 %. Therefore, the as-construct MnCo@FCN/CC//AC/CC high-performance flexible supercapacitors should envision broad commercial applications in flexible energy storage devices.