Asymmetric supercapacitor device fabrication of pristine Zeolitic Imidazolate Framework-67 with ultrahigh performance and cyclic stability

Abstract

Employing a simple stirring and cost-effective approach, the pristine Zeolitic Imidazolate Framework-67 (ZIF-67) material is prepared and utilized as an electrode in three- and two-electrode (asymmetric device) configurations. The synthesized material exhibits well-defined rhombic dodecahedral morphology, noteworthy porosity, and a high specific surface area (1109.54 m2g−1). In the three-electrode configuration, the electrochemical study reveals a high specific capacitance (CS) of 377.8 Fg−1 and an outstanding cyclic stability (118.2 %) in a 6 M NaOH aqueous electrolyte. Furthermore, a device with a voltage window of 1.2 V was built employing a positive electrode (ZIF-67) and a negative electrode of activated carbon (AC). Interestingly, the ASSC demonstrated a maximum device-specific capacitance (CS) of 222.40 Fg−1, high energy density (ED) of 21.45 WhKg−1, and the highest power density (PD) of 3231.07 Wkg−1. Afterward, the ASSC device demonstrated remarkable cyclic stability (178.7 %) over 4000 constant galvanostatic charge/discharge (GCD) cycles. Different colors of LEDs (Light Emitting Diodes) and their series combinations are lightened using three devices (connected in series). As a result of the exceptional presentation of ZIF-67, it acts as a possible choice for energy storage devices.