Preparation and electrochemical properties of coconut shell carbon@ZIF-67 derivative composites

This paper reports a novel material consisting of derivatives of coconut shell carbon and metal–organic skeleton (MOF) which could be used as supercapacitors electrode material. Coconut shell carbon@ZIF-67 derivative (designated CC@ZIF-67-D) materials were prepared via hydrothermal method and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and energy dispersive spectroscopy. The results demonstrated that the CC@ZIF-67-D was successfully prepared were obtained after calcination, and the ZIF-67-D exhibited uniform distribution on the surface of the coconut shell carbon (noted CC). Electrochemical tests were conducted using an electrochemical workstation and it was found that the specific capacitance of CC as an electrode material was determined to be 96.6 F/g at a current density of 0.1 A/g. The specific capacitance of the capacitor prepared using CC@ZIF-67-D derivative composite was found to be 137.8 F/g. The supercapacitor exhibits a high energy density of 46.2 Wh/kg at the power density of 450 W/kg. This work presents a novel material that has the potential application in energy storage devices. Furthermore, it offers a promising and excellent strategy for the preparation of electrode materials with high performance and good cycling stability.