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چکیده
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Developing high-performance and cost-efficient catalysts for oxygen evolution reaction (OER) has remained a challenging task due to its sluggish kinetics. In this work, a cobalt-copper metal-organic framework (CoCu-MOF) was prepared by a simple co-precipitation method using corresponding metal salts and a 2-methylimidazole ligand. Further, Co2CuS4 nanostructure was derived from CoCu-MOF, using thioacetamide. The product was characterized by X-ray diffraction (XRD) technique, and the crystallite diameter was calculated as 28 nm. The glassy carbon electrode (GCE) was further modified by the Co2CuS4 nanostructures, and was studied by linear voltammetry (LSV) technique. The modified electrode has shown excellent catalytic performance toward oxygen evolution reaction (OER) with low overpotential of 352 mV at a current density of 10 mA cm-2, maximum current density of 391 mA cm-2, and low Tafel slope of 58 mV dec-1 in 1 M KOH. The study suggests the high potential of MOF-derived binary metal sulfides for water-splitting systems or metal-air batteries.
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