Facile Synthesis and Electrochemical Performance of MnZIF67 for Supercapacitor Applications
Ady Frenly Simanullang1, Erna Frida1, Syahrul Humadi 1, Ni Luh Wulan Septiani2, Nazwa Hudaiby3

1. Department of Physics, Faculty of Mathematics and Natural Sciences, Medan, Indonesia
2.Center for Advanced Materials Research (PRMM) - National Research and Innovation Agency (BRIN), Samaun Samaund Minacetable, Jl. Sangkuriang, Dago, Coblong District, Bandung City 40135, Indonesia
3. Master^s Program in Nanotechnology, Graduate School of Multidisciplinary Science and Technology, Institute of Tech-nology in Bandung (ITB), Bandung City, West Jawa Indonesia 40132 5

Abstract

The growing demand for sustainable and high-performance energy storage technologies has stimulated extensive research into advanced electrode materials for supercapacitor applications. In this work, a bimetallic cobalt-manganese zeolitic imidazolate framework (CoMn-ZIF) was successfully synthesized via a facile room-temperature co-precipitation method using cobalt and manganese ions coordinated with 2-methylimidazole. X-ray diffraction (XRD) analysis confirmed the successful formation of the crystalline ZIF structure while preserving the characteristic sodalite (SOD) topology after Mn incorporation. Fourier transform infrared (FTIR) spectroscopy verified the coordination bonding between the metal ions and the imidazolate ligands, indicating the integrity of the framework structure. Scanning electron microscopy (SEM) observations revealed a well-defined rhombic dodecahedral morphology with slight particle agglomeration, further confirming the successful synthesis of CoMn-ZIF.
Electrochemical performance evaluation in a three-electrode configuration demonstrated quasi-rectangular cyclic voltammetry profiles, indicating an electric double-layer capacitance (EDLC)-dominated charge storage mechanism. The CoMn-ZIF electrode delivered a specific capacitance of 152 F g at a current density of 1 A g and retained approximately 76 Persen of its capacitance when the current density was increased to 10 A g, demonstrating good rate capability. Electrochemical impedance spectroscopy revealed low charge-transfer resistance, facilitating efficient ion transport and charge storage. Furthermore, the electrode exhibited excellent cycling stability, maintaining 106% of its initial capacitance after 5000 charge-discharge cycles, indicating an activation process and remarkable structural robustness during prolonged operation. These results highlight the potential of CoMn-ZIF as a promising electrode material for supercapacitor applications, combining favorable capacitive performance with outstanding long-term stability.

Keywords: Supercapacitor- Bimetallic MOFMnZIF67-Electrochemical Performance-Cycling Stability

Topic: Energy and Environmental Physics