Construction of high-performance asymmetric supercapacitor based on FeCo-LDH@C3N4 composite electrode material with penetrating structure

The layered structure of layered double hydroxides (LDH) is the key to its use as an electrode material , however, the lack of efficient charge exchange between layered structures severely limits the application of LDH in supercapacitors . In this work, FeCo-LDH was composited with C 3 N 4 by hydrothermal method , and a penetrating structure was built using the layered structure of the two materials. The penetrating structure provides a channel for charge transfer between FeCo-LDH layers and also solves the self-stacking problem of C 3 N 4 . The structure of the composites was explored by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscope (TEM), and the results showed that FeCo-LDH composited with C 3 N 4 and formed a penetrating structure. In addition, the electrochemical behavior of the electrode material was evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). Electrochemical test results show that it has a high specific capacity (593 C g −1 ) at 1 A g −1 . Furthermore, in order to study the energy storage properties of the composites, the optimal composites were designed as positive electrode as asymmetric supercapacitors , and the designed asymmetric supercapacitor still has a retention rate of 83.72 % after 10,000 cycles. This attractive performance reveals that FeCo-LDH@C 3 N 4 could as an electrode material for high-performance supercapacitors .