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Abstract
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Metal-organic frameworks (MOFs) are a group of high-surface adjustable structures with high porosity, low density, and high thermal stability that consists of organic ligands and metal ions. Lately, MOFs and their derivatives have become ideal electrochemical intermediates due to their properties, such as low cost, non-toxicity, and electrochemical oxidation-reduction properties for electrode modification in various applications ]1-2[. Different compositions of MOF-derived crystals, e.g. metal oxides, sulfides, carbides, and their nanocomposites can be prepared in different sizes, shapes, and compounds of the desired metal ions and organic linkers with the advantages of high specific surface area and good porosity. Therefore, the MOF-derived compounds are widely used in electrochemical devices, especially sensors ]3-4]. The study aimed to synthesize Co-MOF-derived porous cobalt compounds. In this case, Co-MOF was prepared by solvothermal method from cobalt acetate and benzene-1,4-dicarboxylic acid (terephthalic acid, BDC) as precursors in 1:1 ethanol:dimethylformamide (DMF) solvent at 80 °C for 24 hours. The resulting Co-MOF powder was converted to cobalt oxide nanostructures through calcination in a furnace at 480 °C for 3 hours. Finally, cobalt sulfide nanostructures were prepared from MOF-derived cobalt oxide nanostructures by means of thioacetamide in a sealed autoclave at 120 °C for 6 hours. The morphologies of all samples were characterized by field-emission scanning electron microscopy (FE-SEM). The chemical structure of the materials was characterized Fourier-transform infrared (FT-IR) and X-ray energy dispersive (EDX) spectroscopies. The crystal planes of the obtained samples were observed in powder X-ray diffraction (XRD) patterns. The study suggests that the obtained cobalt sulfide nanostructures can be used in different applications, especially electrochemical sensors, separation, and catalysis.
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