Electrodeposition, properties, and composition of rhenium–nickel alloys

Gamburg, Yu. D.; Zhulikov, V. V.

doi:10.1134/s1023193515120058

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…The experiment was carried out under the conditions of intensive stirring of the solution using a magnetic stirrer in such a way as to exclude diffusion restrictions. The predominant deposition of rhenium is characteristic of binary alloys of rhenium with metals of the iron subgroup, deposited from both acidic and alkaline citrate solutions. − Rhenium differs from other refractory metals (tungsten and molybdenum) in the possibility of reducing rhenium ions to metal through cobalt and hydrogen adatoms. In contrast to the generally accepted mechanism of induced codeposition, − in which the discharge of bimetallic complexes containing an iron group metal and a refractory metal occurs on the electrode surface, reduction through hydrogen adatoms avoids the stage of complexation and promotes the formation and growth of individual crystals of rhenium, which are not a component of the alloy, as shown in ref .…”

Section: Resultsmentioning

confidence: 99%

Modeling of the Impact of Convection and Magnetic Field onto Electrodeposition and Functional Properties of CoRe Alloys

Yapontseva¹,

Кublanovsky²,

Маltseva³

et al. 2022

J. Phys. Chem. C

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This paper presents a study of the electrodeposition of binary CoRe alloys from citrate and citrate-pyrophosphate electrolytes under the conditions of natural and forced convection caused by mechanical stirring and when a constant magnetic field (CMF) is applied. It is shown that a change in the complex composition of electrolytes makes it possible to radically change the chemical composition and properties of the obtained coatings: from an alloy deposited from a citrate solution and containing a significant amount of rhenium (up to 72.5 at. %) and which is nonmagnetic to coatings deposited from a citrate-pyrophosphate electrolyte containing 8–40 at. % rhenium and exhibiting magnetic properties. A model of the influence of CMF is proposed, which takes into account the convective flow not only in the direction along but also in the direction perpendicular to the electrode surface and the forces acting on the hydrogen bubbles, which are released during the alloy electrodeposition. The use of CMF makes it possible to improve the quality of electrolytic CoRe alloys and to obtain coatings close in their properties to those of hard magnetic materials.

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Section: Resultsmentioning

confidence: 99%

Modeling of the Impact of Convection and Magnetic Field onto Electrodeposition and Functional Properties of CoRe Alloys

Yapontseva¹,

Кublanovsky²,

Маltseva³

et al. 2022

J. Phys. Chem. C

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“…Gamburg et al 173 also tested a Ni–Re alloy and concluded that the high catalytic activity of the alloy is associated with a high degree of structural disordering. On exposure of Ni–Re alloys to high temperatures, 174 the catalytic activity decreases due to the reduction of Re 6+ to Re 0 .…”

Section: Rhenium Metal Alloysmentioning

confidence: 99%

Rhenium-Based Electrocatalysts for Water Splitting

et al. 2023

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Due to the contamination and global warming problems, it is necessary to search for alternative environmentally friendly energy sources. In this area, hydrogen is a promising alternative. Hydrogen is even more promising, when it is obtained through water electrolysis operated with renewable energy sources. Among the possible devices to perform electrolysis, proton exchange membrane (PEM) electrolyzers appear as the most promising commercial systems for hydrogen production in the coming years. However, their massification is affected by the noble metals used as electrocatalysts in their electrodes, with high commercial value: Pt at the cathode where the hydrogen evolution reaction occurs (HER) and Ru/Ir at the anode where the oxygen evolution reaction (OER) happens. Therefore, to take full advantage of the PEM technology for green H 2 production and build up a mature PEM market, it is imperative to search for more abundant, cheaper, and stable catalysts, reaching the highest possible activities at the lowest overpotential with the longest stability under the harsh acidic conditions of a PEM. In the search for new electrocatalysts and considering the predictions of a Trasatti volcano plot, rhenium appears to be a promising candidate for HER in acidic media. At the same time, recent studies provide evidence of its potential as an OER catalyst. However, some of these reports have focused on chemical and photochemical water splitting and have not always considered acidic media. This review summarizes rhenium-based electrocatalysts for water splitting under acidic conditions: i.e., potential candidates as cathode materials. In the various sections, we review the mechanism concepts of electrocatalysis, evaluation methods, and the different rhenium-based materials applied for the HER in acidic media. As rhenium is less common for the OER, we included a section about its use in chemical and photochemical water oxidation and as an electrocatalyst under basic conditions. Finally, concluding remarks and perspectives are given about rhenium for water splitting.

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