الكترود منعطف اصلاح شده با نانوذرات اكسيد فلزي براي الكتروليز آب /توليد هيدروژن سبز

The development of low-cost an‎d high-performance electrocatalysts in the hydrogen production process, as one of the renewable an‎d clean energy sources, is of great importance. In the present study, metal-organic frameworks (MOFs) containing cobalt, copper, an‎d a bimetallic copper–cobalt phase were synthesized using benzene dicarboxylic acid (BDC) as the ligan‎d. The structure, thermal stability, an‎d surface morphology of the synthesized samples were characterized using various analytical methods including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermal analysis (TGA), an‎d atomic force microscopy (AFM). The electrocatalytic performance of the as-prepared samples was carried out by applying a commercial glassy carbon electrode to conduct various electrochemical analysis including cyclic voltammetry (CV) an‎d linear sweep voltammetry (LSV) in the potential range of −0.8 to −1.8 V. The results showed that compared to the monometallic samples, the bimetallic copper–cobalt compound exhibited better hydrogen production performance. Subsequently in this study, the fabrication of a flexible graphite electrode was used to investigate the electrocatalytic activity of the synthesized samples in order to reduce costs an‎d increase flexibility. This was performed by applying two methods: first, after fabricating the electrode, MOF was dro‎p-casted onto its surface; Second, MOF powder was added to the raw materials during the electrode fabrication at various weight percentages of 2%, 5%, an‎d 10%. A comparison studies of the performance of these two methods revealed that incorporating MOF into the electrode structure during the fabrication process significantly improved electrocatalytic activity an‎d increased hydrogen production. To further investigate the surface properties of the fabricated flexible electrode, a contact angle test was conducted to assess the degree of hydro‎philicity an‎d hydro‎phobicity of the surface. The results indicated that despite the slight increase in the surface hydro‎philicity (from 107° without MOF to 112° at 5% an‎d 120° at 10% by weight), which prevent the detachment of hydrogen gas bubbles from the electrode surface during the reaction, the electrocatalytic performance of the electrode towards the reduction of hydrogen has improved. Atomic force microscope (AFM) images indicate an increase in the effective surface area of the electrode at higher MOF amounts This improved electrocatalytic performance is seemed to be mainly related to the increase of effective surface area, an‎d consequently, an increase in active electrocatalytic sites of the electrode

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