MORPHOLOGICAL MODIFICATION OF METAL ORGANIC FRAMEWORK ZEOLITIC IMIDAZOLATE FRAMEWORK-67 (ZIF-67) WITH HEXADECYLTRIMETHYLAMMONIUM BROMIDE (CTAB) USING PRECIPITATION METHOD AS SUPERCAPACITOR ELECTRODE

• Main Author: Bayu Krisna Pambudi, Anggita
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86796
• Institution: Institut Teknologi Bandung

The demand for renewable energy continues to drive the development of more effective energy storage systems, one of which is the supercapacitor. Supercapacitors are a rapidly evolving energy storage technology alongside batteries, with electrode material serving as a key component that determines their performance. One promising candidate for electrode material is the Metal Organic Framework (MOF), particularly Zeolitic Imidazolate Framework-67 (ZIF-67), which is known for its controllable synthesis process to yield specific morphologies. The ZIF-67 material offers advantages such as high surface area and porosity, which are expected to enhance supercapacitor electrode performance. This study synthesizes ZIF-67 by adding the surfactant Cetyltrimethylammonium Bromide (CTAB) through a precipitation method. The use of CTAB aims to modify the particle morphology to increase its specific surface area, thereby providing more active sites for the charge transfer process. The CTAB concentration variations used are 0,0 gr, 0,005 gr, 0,01 gr, 0,02 gr, and 0,04 gr. Synthesis was carried out at room temperature and followed by drying at 60°C for 48 hours. The material characteristics were analyzed using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier-Transform Infrared (FTIR), Brunauer-Emmett-Teller (BET), and electrochemical testing. The performance as a supercapacitor electrode was tested using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). SEM characterization results indicate that the addition of CTAB can alter the morphology by causing changes in particle size and increasing pore diameter, which can help improve the material's electrochemical performance by enhancing its specific surface area for the adsorption-desorption process of electrolyte ions. The ZIF-67-0,01 CTAB material achieved an optimal specific capacitance of 160,88 F/g at a current density of 1 A/g. Long-cycle stability tests show that ZIF-67-0,01 CTAB retains 96% of its capacitance after 20.000 cycles at a current density of 10 A/g. This study demonstrates the potential of ZIF-67-0,01 CTAB as a supercapacitor electrode material and a precursor for derivative materials. Keywords: Supercapasitor, MOF, ZIF-67, CTAB.