Utilization of a One-Pot Prepared Cobalt Selenide Embedded Carbon Matrix Electrode From ZIF-12 for High-Performance Asymmetric Supercapacitors

Abstract

It is becoming increasingly important to create novel energy storage devices with excellent cycle stability, high power density and high energy density due to the fast advancement in technology. Rechargeable batteries and electrochemical supercapacitors (SCs) are developed as energy storage devices to meet these energy requirements. In this work, a cobalt selenide embedded in a carbon matrix (Co_6.8Se₈@C) produced from ZIF-12 via a one-pot method by our group for the first time was used as an asymmetric SC electrode. In this work, a cobalt selenide embedded in a carbon matrix (Co_6.8Se₈@C) produced from ZIF-12 as a precursor by our group previously has been used as an asymmetric SC electrode. The effects of the structural and morphological properties of this composite material on its electrochemical behaviour and capacitive performance were examined both in a three-electrode system as a single electrode and in an asymmetric SC. The superior electrochemical storage performance with a specific capacitance of 77.06 Fg⁻¹ at 1 Ag⁻¹ and energy density of 27.09 Wh kg⁻¹ at a power density of 441.90 W kg⁻¹ were obtained with high stability and cycle life via the prepared electrode in asymmetric SC device.