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Special Issue "Synthesis of Multicomponential Alloys for Hydrogen and Oxygen Evolution Process in Alkaline Electrolysis"

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Materials Science".

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 1161

Special Issue Editor

Faculty of Non-Ferrous Metals, AGH University of Science and Technology, 30-059 Krakow, Poland
Interests: electrocatalysis; hydrogen evolution process; thin films and coatings electrodeposition
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Special Issue Information

Dear Colleagues,

Metallic nickel is of great interest for a broad range of catalytic and electrochemical applications. One of the oldest and best-described processes is the cathodic evolution of hydrogen from alkaline solutions, which is also implemented in large-scale industrial applications. The most straightforward method for improving catalytic activity is the combination of two or more metals from both parts of the volcano curve, which is considered a state-of-the-art theoretical investigation in the field of electrocatalysis. Most of the scientific literature in this field has focused on the creation of molybdenum and tungsten alloys with elements located on the left side of a volcano curve, such as Co, Fe, and Ni, where catalytic improvements are linked via an increase in the electroactive surface area and formation of nano- or amorphous phases, demonstrating a synergetic effect. Despite the brilliant catalytic activity of Mo- and W-based alloys, it should be underlined that an alkaline environment is very corrosive for these two elements. Mo and W phases can be easily leached from a metallic matrix, destroy the alloy structure, and diminish their electrochemical performance. Many studies have been conducted regarding the synthesis of durable and highly active materials in the water-splitting processes over the last two decades.

This Special Issue is seeking novel studies and communication papers that address the synthesis and evaluate the properties of different multicomponential alloys. The combination of five different elements can lead to the synthesis of a single-phase structure, which is called a high-entropy alloy. According to publication records, these alloys can exhibit an excellent performance in different applications, in comparison to the traditional two or three elemental alloys.

We are also more than honored to announce that the Topical Advisory Panel Member Dr. Dawid Kutyła (from AGH University of Science and Technology, Poland) will be participating in this Special Issue. 

Prof. Dr. Piotr Żabiński
Guest Editor

Manuscript Submission Information

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  • electrodeposition
  • hydrogen evolution
  • multielemental alloys

Published Papers (1 paper)

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Electrocatalytic Performance of Ethanol Oxidation on Ni and Ni/Pd Surface-Decorated Porous Structures Obtained by Molten Salts Deposition/Dissolution of Al-Ni Alloys
Int. J. Mol. Sci. 2023, 24(4), 3836; https://doi.org/10.3390/ijms24043836 - 14 Feb 2023
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Ni coatings with high catalytic efficiency were synthesised in this work, obtained by increasing the active surface and modifying Pd as a noble metal. Porous Ni foam electrodes were obtained by electrodeposition of Al on a nickel substrate. Deposition of Al was carried [...] Read more.
Ni coatings with high catalytic efficiency were synthesised in this work, obtained by increasing the active surface and modifying Pd as a noble metal. Porous Ni foam electrodes were obtained by electrodeposition of Al on a nickel substrate. Deposition of Al was carried out with potential −1.9 V for a time of 60 min in NaCl–KCl-3.5 mol%AlF3 molten salt mixture at 900 °C, which is connected with the formation of the Al-Ni phase in the solid state. Dissolution of Al and Al-Ni phases was performed by application of the potential −0.5 V, which provided the porous layer formation. The obtained porous material was compared to flat Ni plates in terms of electrocatalytic properties for ethanol oxidation in alkaline solutions. Cyclic voltammetry measurements in the non-Faradaic region revealed the improvement in morphology development for Ni foams, with an active surface area 5.5-times more developed than flat Ni electrodes. The catalytic activity was improved by the galvanic displacement process of Pd(II) ions from dilute chloride solutions (1 mM) at different times. In cyclic voltammetry scans, the highest catalytic activity was registered for porous Ni/Pd decorated at 60 min, where the maximum oxidation peak for 1 M ethanol achieved +393 mA cm−2 compared to the porous unmodified Ni electrode at +152 mA cm−2 and flat Ni at +55 mA cm−2. Chronoamperometric measurements in ethanol oxidation showed that porous electrodes were characterised by higher catalytic activity than flat electrodes. In addition, applying a thin layer of precious metal on the surface of nickel increased the recorded anode current density associated with the electrochemical oxidation process. The highest activity was recorded for porous coatings after modification in a solution containing palladium ions, obtaining a current density value of about 55 mA cm−2, and for a flat unmodified electrode, only 5 mA cm−2 after 1800 s. Full article
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