Akademik Veri Yönetim Sistemi
Journal of Molecular Structure, cilt.1341, 2025 (SCI-Expanded)
High-performance MnCo₂O₄ (MCO) supercapacitor electrode materials were established in the form of nanoflowers, intermediate phase, and nanocubes, were fabricated by varying the hydrothermal synthesis temperature: 100 °C (MCO100), 120 °C (MCO120), and 140 °C (MCO140), respectively. The individual crystal phase structures of the materials were characterized by X-ray diffraction, which revealed a cubic crystal structure with a Fd-3 m space group, in all cases. The morphology and surface area of the samples were imaged using field emission scanning electron microscopy, and shown that MCO100 nanoflowers, MCO120 intermediate phase, and MCO140 nanocubic structures exhibited distinct morphologies. The Brunauer-Emmett-Teller analysis yielded the following surface areas: 60.75, 64.15, and 73.95 m2g-1 for MCO100, MCO120, and MCO140, respectively. XPS analysis has provided information about the oxidation states and chemical composition of the produced materials. TEM images of MCO140 sample revealed rod-like nanostructures become visible with a width size of 40 nm. Moreover, clearer, sharper-edged nanostructures resembling rods, surrounded by small spherical nanoparticles, with an average size of 10 nm. The cyclic voltammetry studies revealed that the MCO140 material with a three-electrode cell set up with 6 M KOH solution, which composed of nanocubes, exhibited a specific capacitance value of 213.94 F g-1 and a specific capacitance retention of approximately 103.95 %, after 1000 charge-discharge cycles at a current density of 4 A g-1. The electrochemical properties of this electrode material was found to be significant due to the increased charge mobility of electrons and ionic species resulting from the increased surface area caused by the high hydrothermal synthesis temperature.