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Abstract
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Metal-organic frameworks (MOFs) are crystalline extended solid-state porous structures composed of metal ions or clusters as nodes linked by organic ligands. These periodic structures contain unique properties such as uniform porosity and extensively high surface area. MOFs have great potential for various applications from gas storage, separations, sensing, and catalysis, to energy harvesting and storage [1, 2]. Mixed-metal metal-organic frameworks (MM-MOFs) can be considered as MOFs having two metals anywhere in the structure. It is well-known that MM-MOFs mostly provide the advantage of the complexity and the synergism derived from the presence of different metal ions in the structure in comparison to homometallic MOFs [3]. MM-MOFs also presented superior performance and stability with respect to the corresponding single metal ones. Therefore, the current research has aimed to develop a porous efficient cobalt-copper bimetallic MOF by means of the solvothermal method. In this regard, cobalt acetate and copper acetate as metallic precursors, benzene-1,4-dicarboxylic acid (terephthalic acid, BDC) as ligand, and 1:1 ratio of ethanol : dimethylformamide (DMF) as solvents were added to a Teflon-lined stainless steel autoclave and stored in an oven at 80 °C for 24 hours. The morphology of the collected precipitants was characterized by field-emission scanning electron microscopy (FE-SEM) followed by Xray energy dispersive spectroscopy (EDS) and elemental mapping analysis. Further, the metal-ligand bond was detected by the characteristic stretching peaks in Fourier-transform infrared spectroscopy (FT-IR). The crystal phases of the obtained samples were recorded in X-ray diffraction (XRD) patterns. The study suggests that the resulting material and its derivatives would be suitable for various applications such as electrochemical energy storage and catalysis.
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