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Catalytic Properties of Electroless Nickel-Based Coatings Modified by the Magnetic Field

Kołczyk-Siedlecka Karolina, Kutyła Dawid, Skibińska Katarzyna, Jędraczka Anna, Żabiński Piotr

Archives of Metallurgy and Materials

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2024

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Vol. 69, iss. 1

17--24

EN

In this work the nickel-based coatings were obtained by electroless catalytic deposition on light-hardened resins dedicated for 3D printing by SLA method. The effect of external magnetic field application on the properties of nickel-based coatings was determined. During metallization, the magnetic field was applied to the sample’s surface with different orientations. Due to the magnetic properties of metallic ions, the influence of the magnetic field on coatings properties is expected. The coatings were analyzed by Energy-dispersive X-ray spectroscopy (EDS) the X-Ray diffraction (XRD) methods, and surface morphology was observed by scanning electron microscopy (SEM). The catalytic properties in a hydrogen evolution reaction (HER) were measured by electrochemical method in 1 M NaOH solution. The best catalytic activity has been observed in the case of the ternary Ni-Fe-P alloy deposited under a parallel magnetic field. The primary outcome of the presented research is to produce elements based on 3D printing from resins, which can then be metallized and used for highly-active materials deposited on complex 3D models. Furthermore, these elements can be used as low-cost, highly-developed sensors and catalysts for various chemical processes.

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Electrocatalytic properties of Ni-Cu structures fabricated by electrodeposition of Cu on Ni cones

Skibińska Katarzyna, Elsharkawy Safya, Kutyła Dawid, Boryczko Bożena, Marzec Mateusz M., Żabiński Piotr

Archives of Civil and Mechanical Engineering

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2024

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Vol. 24, no. 2

art. no. e138, 2024

EN

Ni-Cu alloys are a suitable candidate as a catalyst in Hydrogen Evolution Reaction due to their catalytic performance and good stability. To enhance this activity more, the active surface area of the material should be enhanced. It is commonly achieved by the synthesis of metals and alloys in the form of nanostructures. In this work, Ni cones fabricated by the one-step method were applied as a substrate for the deposition of thin Cu layers. Then, these materials were annealed in an ambient atmosphere to obtain Ni-Cu structures. The investigation of changes in morphology and chemical composition, as well as roughness and wettability before and after the annealing process was performed. Moreover, the measurements of catalytic properties were carried out in 1 M NaOH. The values of the Tafel slope and the electrochemical active surface area were studied. The proposed method can be successfully applied to fabricate structures of other alloys for the desired properties.

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Hydrogen evolution reaction (HER) activity of conical Co–Fe alloy structures and their application as a sensitive and rapid sensor for H2O2 detection

Skibińska Katarzyna, Kutyła Dawid, Kula Anna, Gajewska Marta, Marzec Mateusz M., Żabiński Piotr

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 2

art. no. e76, 1--10

EN

In this work, the conical Co–Fe alloy structures were synthesized by two different methods: a two- and a one-step. The synthesis of nanoconical structures with regular, well-defined geometrical features, called the two-step method, requires using porous Anodic Alumina Oxide (AAO) templates. Contrary, any advanced pre-preparation of the substrate is not necessary for the one-step method. The fabrication of cones is carried out from the electrolyte containing an addition of a crystal modifier. Co and Fe are applied as electrodes in an alkaline environment. Their catalytic performance can be enhanced by modification of the shape and size of their structures, and in consequence, developing their active surface area. Many methods were used to analyze the coatings, such as Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy-Dispersive X-ray Spectroscopy (EDS), Energy-Dispersive X-ray Spectrometry (EDAX), X-ray Photoelectron Spectroscopy (XPS), and X-ray diffraction analysis (XRD). The catalytic properties of the coatings were recorded during the hydrogen evolution reaction and the reduction of the hydrogen peroxide and compared with the catalytic activity of bulk alloy. Nanocones produced in AAO templates were characterized by significantly higher catalytic activity and sensitivity in both reactions. However, they were unstable in the time of the experiment duration. Cones synthesized by the one-step method can be successfully applied as a catalyst and H2O2 detector.

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Synthesis of conical Co–Fe alloys structures obtained with crystal modifier in superimposed magnetic field

Skibińska Katarzyna, Kutyła Dawid, Kołczyk-Siedlecka Karolina, Marzec Mateusz M., Żabiński Piotr, Kowalik Remigiusz

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 4

507--517

EN

The addition of crystal modifier to electrolyte used during electrodeposition of metals and alloys allows obtaining conical structures without using any template. This method is fast and ensures covering large areas during one single electrodeposition process. In this work, Co–Fe cones were obtained by one-step method with ammonium chloride as a crystal modifier. The influence of electrodeposition parameters and electrolyte compositions were investigated. Electrodeposition conditions (duration, electrolyte temperature, and addition of NH4Cl), which allow obtaining the most uniform conical structures, were applied during sample fabrication in the magnetic field. The influence of its value and direction on the quality and compositions of obtained alloys was investigated using Scanning Electron Microscope (SEM) photos. To check if there is any change in the sample crystal system, the X-Ray Diffraction (XRD) analysis was performed. To confirm the synthesis of Co–Fe cones, they were analyzed using the X-ray photoelectron Spectroscopy (XPS) method.