Interfacial construction promoted binder-free NiCo-LDH/Mn-ZIF on carbon cloth for high-performance supercapacitor

Electrode materials with large theoretical specific capacity and high utilization are essential for high-performance supercapacitors. In order to overcome the deficiencies of easy agglomeration and poor intrinsic conductivity, NiCo-LDH with high theoretical specific capacity was integrated with Mn-ZIF grown on carbon cloth (Mn-ZIF/CC) via a simple impregnation-hydrothermal method. The optimal NiCo-LDH/Mn-ZIF/CC (NCM-2/CC) electrode showed a specific capacity of 321.3 mA h g-1 (642.6 C g-1 or 2313.4 F g-1) at 1 A g-1, higher than NiCo-LDH/CC (146.5 mA h g-1) and Mn-ZIF/CC (27.8 mA h g-1). The assembled NCM-2/CC-containing hybrid supercapacitor (HSC) realized a power density of 71.5 W h kg-1 at 800 W kg-1, superior to most of the previously reported NiCo-LDH-based devices. The interfacial construction enhances the electrical conductivity and enlarges electrochemically active surface area (ECSA) of NiCo-LDH, leading to a promoted utilization of the electrode material and its subsequent supercapacitive properties. The facile synthesis route and impressive electrochemical performance endow the NCM-2/CC electrode with a promising application for high-performance supercapacitors.